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• Idea to develop a caching server between IIS and SQL Server

  - by John

  I work on a few high traffic websites that all share the same database and that are all heavily database driven. Our SQL server is max-ed out and, although we have already implemented many changes that have helped but the server is still working too hard. We employ some caching in our website but the type of queries we use negate using SQL dependency caching. We tried SQL replication to try and kind of load balance but that didn't prove very successful because the replication process is quite demanding on the servers too and it needed to be done frequently as it is important that data is up to date. We do use a Varnish web caching server (Linux based) to take a bit of the load off both the web and database server but as a lot of the sites are customised based on the user we can only do so much. Anyway, the reason for this question... Varnish gave me an idea for a possible application that might help in this situation. Just like Varnish sits between a web browser and the web server and caches response from the web server, I was wondering about the possibility of creating something that sits between the web server and the database server. Imagine that all SQL queries go through this SQL caching server. If it's a first time query then it will get recorded, and the result requested from the SQL server and stored locally on the cache server. If it's a repeat request within a set time then the result gets retrieved from the local copy without the query being sent to the SQL server. The caching server could also take advantage of SQL dependency caching notifications. This seems like a good idea in theory. There's still the same amount of data moving back and forward from the web server, but the SQL server is relieved of the work of processing the repeat queries. I wonder about how difficult it would be to build a service that sort of emulates requests and responses from SQL server, whether SQL server's own caching is doing enough of this already that this wouldn't be a benefit, or even if someone has done this before and I haven't found it? I would welcome any feedback or any references to any relevant projects.

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• Why is String Templating Better Than String Concatenation from an Engineering Perspective?

  - by stephen

  I once read (I think it was in "Programming Pearls") that one should use templates instead of building the string through the use of concatenation. For example, consider the template below (using C# razor library) <in a properties file> Browser Capabilities Type = @Model.Type Name = @Model.Browser Version = @Model.Version Supports Frames = @Model.Frames Supports Tables = @Model.Tables Supports Cookies = @Model.Cookies Supports VBScript = @Model.VBScript Supports Java Applets = @Model.JavaApplets Supports ActiveX Controls = @Model.ActiveXControls and later, in a separate code file private void Button1_Click(object sender, System.EventArgs e) { BrowserInfoTemplate = Properties.Resources.browserInfoTemplate; // see above string browserInfo = RazorEngine.Razor.Parse(BrowserInfoTemplate, browser); ... } From a software engineering perspective, how is this better than an equivalent string concatentation, like below: private void Button1_Click(object sender, System.EventArgs e) { System.Web.HttpBrowserCapabilities browser = Request.Browser; string s = "Browser Capabilities\n" + "Type = " + browser.Type + "\n" + "Name = " + browser.Browser + "\n" + "Version = " + browser.Version + "\n" + "Supports Frames = " + browser.Frames + "\n" + "Supports Tables = " + browser.Tables + "\n" + "Supports Cookies = " + browser.Cookies + "\n" + "Supports VBScript = " + browser.VBScript + "\n" + "Supports JavaScript = " + browser.EcmaScriptVersion.ToString() + "\n" + "Supports Java Applets = " + browser.JavaApplets + "\n" + "Supports ActiveX Controls = " + browser.ActiveXControls + "\n" ... }

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• An XML file or Database?

  - by webnoob

  I am re-writing a section of my site and am trying to decide how much of a rewrite this will be. At the moment I have a web service feed that generates an xml once per day. I then use this xml file on my website to generate the general structure. I am trying to decide if this information should be located in the database or stay in the xml file. The file can range from 4mb - 12mb. The files depth can go on and on so I have to recurse to find the data I want. I use the .NET serializer classes and store the serialized file in a global variable to avoid re-serializing it each time the page is loaded. My reasons for thinking a database would be better are: I would know exactly where I am in the file by using an internal ID so I wouldn't have to recurse the file to get information. I wouldn't have to load / serialize the XML and could just use my already open database connections. Searching for the data in the file would be quicker(?) as I would just perform an SQL query rather than re-cursing the file. Has anyone got any ideas which is better and which option uses more resources on the server or be quicker? EDIT: The file is read every time the web page is loaded (although only serialized once). It isn't written to by standard users (only by an admin task that runs in the middle of the night). This is my initial investigation before mocking up.

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• Team Foundation Server – How to pass ReferencePath argument to MSBuild

  - by Gopinath

  When we manually build a .NET project using Visual Studio, the reference paths set in Project Properties are picked up by Visual Studio for referring to dependent DLLs. But the project is built using TFS, the reference path’s specified in project properties are not considered. This is because Reference Paths are user specific settings and they are not stored in .proj files(they are stored in user settings files). The TFS build may break if it does not find the required DLLs in GAC. We can solve the problem by passing ReferencePath parameter to MSBuild in TFS build configurations. Go to Team Explorer Select Build Defintion >> Edit Build Definition Switch to Process tab Navigate to Advanced Section and locate MSBuild Arguments Add the following: /p:ReferencePath=”{File path}”

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• Why am I getting this error : "ExecuteReader: Connection property has not been initialized." [migrated]

  - by Olga

  I'm trying to read .csv file to import its contents to SQL table I'm getting error: ExecuteReader: Connection property has not been initialized. at the last line of this code: Function ImportData(ByVal FU As FileUpload, ByVal filename As String, ByVal tablename As String) As Boolean Try Dim xConnStr As String = "Driver={Microsoft Text Driver (*.txt; *.csv)};dbq=" & Path.GetDirectoryName(Server.MapPath(filename)) & ";extensions=asc,csv,tab,txt;" ' create your excel connection object using the connection string Dim objXConn As New System.Data.Odbc.OdbcConnection(xConnStr.Trim()) objXConn.Open() Dim objCommand As New OdbcCommand(String.Format("SELECT * FROM " & Path.GetFileName(Server.MapPath(filename)), objXConn)) If objXConn.State = ConnectionState.Closed Then objXConn.Open() Else objXConn.Close() objXConn.Open() End If ' create a DataReader Dim dr As OdbcDataReader dr = objCommand.ExecuteReader()

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• Reasons to Use a VM For Development

  - by George Stocker

  Background: I work at a start-up company, where one team uses Virtual Machines to connect to a remote server to do their development, and another team (the team I'm on) uses local IIS/SQL Server 2005/Visual Studio installations to conduct work. Team VM is located about 1000 miles from Team Non-VM, and the servers the VMs run off of are located near Team VM (Latency, for those that are wondering, is about 50ms). A person high in the company is pushing for Team Non-VM to use virtual machines for programming, development, and testing. The latter point we agree on -- we want Virtual Machines to test configurations and various aspects of the web application in a 'clean' state. The Problem: What we don't agree on is having developers using RDP to connect to a desktop remotely that contains Visual Studio, SQL Server, and IIS to do the same development we could do locally on our laptops. I've tried the VM set-up, and besides the color issue, there is a latency issue that is rather noticeable, not to mention that since we're a start-up, a good number of employees work from home on occasion with our work laptops, and this move would cut off the laptops. They'd be turned in. Reasons to Use Remote VMs for Development (Not Testing!): Here are the stated reasons that this person wants us to use VMs: They work for TeamVM. They keep the source code "safe". If we want to work from home, we could just use our home PCs. Licenses (I don't know what the argument is, only that it's been used). Reasons not to use Remote VMs for Development: Here are the stated reasons why we don't want to use VMs: We like working from home. We get a lot done on our own time. We're not going to use our Home PCs to do work related stuff. The Latency is noticeable. Support for the VMs (if they go down, or if we need a new VM) takes a while. We don't have administrative privileges on the VM, and are unable to change settings as needed. What I'm looking for from the community is this: What reasons would you give for not using VMs for development? Keep in mind these are remote VMs -- this isn't a VM running on a local desktop. It's using the laptop (or a desktop) as a thin client for a remote VM. Also, on the other side of the coin: Is there something we're missing that makes VMs more palatable for development? Edit: I think 'safe' is used in term of corporate espionage, or more correctly if the Laptop gets stolen, the person who stole would have access to our source code. The former (as we've pointed out, is always going to be a possibility -- companies stop that with litigation, there isn't a technical solution (so far as I can see)). The latter point is ( though I don't know its usefulness in a corporate scenario) mitigated by Truecrypt'ing the entire volume.

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• Best practices for logging user actions in production

  - by anthonypliu

  I was planning on logging a lot of different stuff in my production environment, things like when a user: Logs In, Logs Off Change Profile Edit Account settings Change password ... etc Is this a good practice to do on a production enviornment? Also what is a good way to log all this. I am currently using the following code block to log to: public void LogMessageToFile(string msg) { System.IO.StreamWriter sw = System.IO.File.AppendText( GetTempPath() + @"MyLogFile.txt"); try { string logLine = System.String.Format( "{0:G}: {1}.", System.DateTime.Now, msg); sw.WriteLine(logLine); } finally { sw.Close(); } } Will this be ok for production? My application is very new so im not expecting millions of users right away or anything, looking for the best practices to keeping track of actions on a website or if its even best practice to.

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• MySQL vs. SQL Server Go daddy, What is the difference bewteen hosted DB and App_Data Db.

  - by Nate Gates

  I'm using Goddady for site hosting, and I'm currently using MySQL, because there are less limits on size,etc. My question is what is the difference between using a hosted Godaddy Db such as MySQL vs. creating a SQL Serverdatabase in the the App_Data folder? My guess is security? Would it be a bad idea to use a SQL ServerDB thats located in the App_Data folder? Additional Well I am able to create a .mdf (SQL Server DB file) in the App_Data folder, but I'm really unsure if should use that or not, If I did use it it would simplify using some of the Microsoft tools. Like I said my guess is that it would be less secure, but I don't really know. I know I have a 10gb, file system limit, so I'm assuming my db would have to share that space.

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• Callback Contract in WCF

  Callback contracts are a very powerful concept that is easily implemented in WCF. Using this, it is very easy to achieve event-like behavior between a service and client (duplex operations).

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• What is the best way to create HTML in C# code?

  - by Rodney

  I have a belief that markup should remain in mark-up and not in the code behind. I've come to a situation where I think it is acceptable to build the HTML in the code behind. I'd like to have some consensus as to what the best practices are or should be. When is it acceptable to build html in the code behind? What is the best method to create this html? (example: Strings, StringBuilder, HTMLWriter, etc)

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• Is it a good idea to put all assembly: WebResource in the same cs file?

  - by Guilherme J Santos

  I have a .NET library, with some WebControls. These webControls have Embed Resources. And we declare them like it, in all webcontrols for each cs file: Something like this: [assembly: WebResource("IO.Css.MyCSS.css", "text/css")] namespace MyNamespace.MyClass { [ParseChildren(true)] [PersistChildren(false)] [Designer(typeof(MyNamespace.MyClassDesigner))] public class QuickTip : Control, INamingContainer { //My code... } } Would it be a good idea to create a cs file and include all WebResource declarations there? Example a cs file with just: [assembly: WebResource("IO.Css.MyCSS.css", "text/css")] [assembly: WebResource("IO.Image.MyImage.png", "image/png")] //And many other WebResources of all WebControls of the Assembly

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• Adding page title to each page while creating a PDF file using itextsharp in VB.NET

  - by Snowy

  I have recently started using itextsharp and gradually learning it. So far I created a PDF file and it seems great. I have added a table and some subtables as the first table cells to hold data. It is done using two for loops. The first one loops through all data and the second one is each individual data displayed in columns. The html outcome looks like the following: <table> <tr> <td>Page title in center</td> </tr> <tr> <td> <table> <tr> <td>FirstPersonName</td> <td>Rank1</td> <td>info1a</td> <td>infob</td> <td>infoc</td> </tr> </table> </td> <td> <table> <tr> <td>SecondPersonName</td> <td>Rank2</td> <td>info1a</td> <td>infob</td> <td>infoc</td> <td>infod</td> <td>infoe</td> </tr> </table> </td> <td> <table> <tr> <td>ThirdPersonName</td> <td>Rank2</td> <td>info1a</td> <td>infob</td> <td>infoc</td> <td>infod</td> <td>infoe</td> <td>infof</td> <td>infog</td> </tr> </table> </td> </tr> </table> For page headings, I added a cell at the top before any other cells. I need to add this heading to all pages. Depending on the size of data, some pages have two rows and some pages have three rows of data. So I can not tell exactly when the new page starts to add the heading/title. My question is how to add the heading/title to all pages. I use VB.net. I searched for answer online and had no success. Your help would be greatly appreciated.

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• What is the difference between WCF service and a simple Web service in developing using .NET Framework?

  - by Steve Johnson

  My questions are: What is the difference between WCF service and a simple Web service in .NET Framework? What a WCF Service can do which a .NET Web service cant? In other words, what are the limitation of .NET Web services which were overcome in WCF services? I understand that WCF are REST based and .NET web services are SOAP based. But I need to know more than that. How a developer will make a design decision whether to developer a Web service or a WCF service?

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• Tag Cloud with jQuery Effect

  Tag Cloud WebControl built on the Star Field jQuery plug-in

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• Session state provider and atomic operations

  - by vtortola

  Hi, I've been thinking about this and it is blowing my mind... How does a session state provider properly works internally? I mean, I tried to write a custom session state provider based on Azure Tables or Blobs, but quickly I realized that because there is no way to ensure an atomic operation or establish a lock, race conditions are suitable to happen when several web servers do operation on that shared information. I know that there is a SQL Server Session State Provider (SQLS-SSP) and people is happy with it, so I guess that it's using some kind of transaction isolation level in order to accomplish some degree of concurrent safety, like checking is the data is lock (a simple column), locking it if not and returning the data in an atomic operation, but is that so? what does happen if the data is lock? does it returns an error? block the call for a while? returns it in read-only fashion? Cloud computing paradigms could be somehow new, but webfarms have been here for a while, so as I'm pretty new on it... do you recommend any good lecture about the topic? Thanks.

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• WCF/webservice architecture question

  - by M.R.

  I have a requirement to create a webservice to expose certain items from a CMS as a web service, and I need some suggestions - the structure of the items is as such: item - field 1 - field 2 - field 3 - field 4 So, one would think that the class for this will be: public class MyItem { public string ItemName { get; set; } public List<MyField> Fields { get; set; } } public class MyField { public string FieldName { get; set; } public string FieldValue { get; set; } //they are always string (except - see below) } This works for when its always one level deep, but sometimes, one of the fields is actually a point to ANOTHER item (MyItem) or multiple MyItem (List<MyItem>), so I thought I would change the structure of MyField as follows, to make FieldValue as object; public class MyField { public string FieldName { get; set; } public object FieldValue { get; set; } //changed to object } So, now, I can put whatever I want in there. This is great in theory, but how will clients consume this? I suspect that when users make a reference to this web service, they won't know which object is being returned in that field? This seems like a not-so-good design. Is there a better approach to this?

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• Is this form of cloaking likely to be penalised?

  - by Flo

  I'm looking to create a website which is considerably javascript heavy, built with backbone.js and most content being passed as JSON and loaded via backbone. I just needed some advice or opinions on likely hood of my website being penalised using the method of serving plain HTML (text, images, everything) to search engine bots and an js front-end version to normal users. This is my basic plan for my site: I plan on having the first request to any page being html which will only give about 1/4 of the page and there after load the last 3/4 with backbone js. Therefore non javascript users get a 'bit' of the experience. Once that new user has visited and detected to have js will have a cookie saved on their machine and requests from there after will be AJAX only. Example If (AJAX || HasJSCookie) { // Pass JSON } Search Engine server content: That entire experience of loading via AJAX will be stripped if a google bot for example is detected, the same content will be servered but all html. I thought about just allowing search engines to index the first 1/4 of content but as I'm considered about inner links and picking up every bit of content I thought it would be better to give search engines the entire content. I plan to do this by just detected a list of user agents and knowing if it's a bot or not. If (Bot) { //server plain html } In addition I plan to make clean URLs for the entire website despite full AJAX, therefore providing AJAX content to www.example.com/#/page and normal html to www.example.com/page is kind of our of the question. Would rather avoid the practice of using # when there are technology such as HTML 5 push state is around. So my question is really just asking the opinion of the masses on if it's likely that my website will be penalised? And do you suggest an alternative which avoids 'noscript' method

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• Should one bind data with Eval on aspx or override ItemDataBound in code-behind?

  - by George Chang

  For data bound controls (Repeater, ListView, GridView, etc.), what's the preferred way of binding data? I've seen it where people use Eval() directly on the aspx/ascx inside the data bound control to pull the data field, but to me, it just seems so...inelegant. It seems particularly inelegant when the data needs to be manipulated so you wind up with shim methods like <%# FormatMyData(DataBinder.Eval(Container.DataItem, "DataField")) %> inside your control. Personally, I prefer to put in Literal controls (or other appropriate controls) and attach to the OnItemDataBound event for the control and populate all the data to their appropriate fields in the code-behind. Are there any advantages of doing one over the other? I prefer the latter, because to me it makes sense to compartmentalize the data binding logic and the presentation layer. But maybe that's just me.

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• IIS - HTTP Redirect all requests for one virtual directory to another

  - by nekno

  How do I set up an HTTP Redirect rule to redirect all requests for a virtual directory to another virtual directory, when I don't know the hostname or complete URL, and cannot use the URL Rewrite module? The following redirects should work: http://host1/app/oldvdir -> http://host1/app/newvdir http://host1/app/oldvdir/ -> http://host1/app/newvdir/ http://host1/app/oldvdir/login.aspx -> http://host1/app/newvdir/login.aspx http://host2/app/oldvdir/login.aspx -> http://host2/app/newvdir/login.aspx I would like to place the redirect rule in the app's root web.config. I have attempted the following rules, but the end result is simply that the redirected vdir gets duplicated on the end of the original vdir until reaching the max URL length, e.g., http://host/oldvdir/login.aspx -> http://host/oldvdir/newvdir/newvdir/newvdir/... Rules in root web.config (I also have tried all sorts of combinations of settings with and without leading and trailing slashes, etc): <location path="oldvdir"> <system.webServer> <httpRedirect enabled="true" exactDestination="false" httpResponseStatus="Permanent"> <add wildcard="*/oldvdir/*" destination="/newvdir/"/> </httpRedirect> </system.webServer> </location> <location path="oldvdir/"> <system.webServer> <httpRedirect enabled="true" exactDestination="false" destination="/newvdir" httpResponseStatus="Permanent"/> </system.webServer> </location>

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• Handling Deployment to Multiple Environments

  - by JayGee

  How should I handle deploying web applications to multiple servers? Constraints I have a dev, test and prod environment. No build server is available. Developers can't deploy to prod. The people that do deploy to prod copy files from test to prod. They don't have VS installed. Currently The way it's handled is using web.config transform. However, to deploy to prod involves putting prod code on the test server where it's copied over. Problem Sometimes simple mistakes are made, such as forgetting to change test back to the right environment after deployment. Or the test config gets moved to prod instead of the prod config. Solution So the question is, what is the best way to prevent mistakes from happening? My first thought is let the app determine which server it's on at runtime and use the appropriate settings/connection strings/etc... However, the server names could change in the not too distant future. So if multiple apps are hard coded, that would mean updating all of them. The easiest way to handle that situation would be to place a DLL in the GAC that determines the environment. Are there any drawbacks or possible complications that this would cause? Or is there a better solution to the problem than this?

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• In which cases build artifacts will be different in different environments

  - by Sundeep

  We are working on automation of deployment using Jenkins. We have different environments - DEV, UAT, PROD. In SVN, we are tagging each release and placing same binaries in DEV, UAT, PROD. The artifacts already contains config files w.r.t each environment but I am not understanding why we are storing binaries in environment folder again. Are there any scenarios where deployment might be different for different environments.

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• Exposing warnings\errors from data objects (that are also list returned)

  - by Oren Schwartz

  I'm exposing Data objects via service oriented assembly (which on future usages might become a WCF service). The data object is tree designed, as well as formed from allot of properties.Moreover, some services return one objects, others retrieve a list of them (thus disables throwing exceptions). I now want to expose data flow warnings and wondering what's the best way to do it having to things to consider: (1) seperation (2) ease of access. On the one hand, i want the UI team to be able to access a fields warnings (or errors) without having them mapping the field names to an external source but on the other hand, i don't want the warnings "hanged" on the object itself (as i don't see it a correct design). I tought of creating a new type of wrapper for each field, that'll expose events and they'll have to register the one's they care about (but totally not sure) I'll be happy to hear your thoughts. Could you please direct me to a respectful design pattern ? what dp will do best here ? Thank you very much!

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• Performing a SAML Post with C#

  Code performing a SAML Post which can be used for Single Sign On applications

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• Reasonable technological solutions to create CRM using .NET eventually Java

  - by user1825608

  My background(If it's too long, just skip it please ; ) ): I am Java programmer(because of demand): mostly teacher for other students, worked on few thesis for others, but during my journey I discovered that .NET and Microsoft's tools are on at least two levels higher than Java and its tools so I want to learn more about them. I programmed little bit on Windows Phone(NFC Tags, TCP Clients, guitar tuner using internal microphone, simple RSS), used WPF, integrated WPF with Windows Forms, Apple Bonjour(.NET), I have expierience with IP cameras and with unusal problems, I learn Android, but I don't like it at all. Problem: I was asked by my friend to create CRM for small new company. There will maximum 20 workers in the company working at computers in few cities in the country(Poland). They just want to store contracts with the clients and client's data. I am not sure what exacly they do but probably sell apartments so there will be at most few thousands of contracts to store in far future. Now I am totally new to CRM but I want to learn. I have few questions: Should the data be stored on a server in the company's building running 24/7 or cloud. If cloud which one? Should I use ASPX or WPF. I read one topic about it but as far as I know aspx sites can be viewed from every device with internet browser: tablets, phones(Android, WP, iOS) and computers at the same time- so the job is done once and for all(Am I right?), I don't know nothing about aspx. Can WPF be also used in manner that does not need to port it for other platforms?

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• String contains trailing zeroes when converted from decimal [migrated]

  - by Locke

  I've run into an unusual quirk in a program I'm writing, and I was trying to figure out if anyone knew the cause. Note that fixing the issue is easy enough. I just can't figure out why it is happening in the first place. I have a WinForms program written in VB.NET that is displaying a subset of data. It contains a few labels that show numeric values (the .Text property of the labels are being assigned directly from the Decimal values). These numbers are being returned by a DLL I wrote in C#. The DLL calls a webservice which initially returns the values in question. It returns one as a string, the other as a decimal (I don't have any control over the webservice, I just consume it). The DLL assigns these to properties on an object (both of which are decimals) then returns that object back to the WinForm program that called the DLL. Obviously, there's a lot of other data being consumed from the webservice, but no other operations are happening which could modify these properties. So, the short version is: WinForm requests a new Foo from the DLL. DLL creates object Foo. DLL calls webservice, which returns SomeOtherFoo. //Both Foo.Bar1 and Foo.Bar2 are decimals Foo.Bar1 = decimal.Parse(SomeOtherFoo.Bar1); //SomeOtherFoo.Bar1 is a string equal to "2.9000" Foo.Bar2 = SomeOtherFoo.Bar2; //SomeOtherFoo.Bar2 is a decimal equal to 2.9D DLL returns Foo to WinForm. WinForm.lblMockLabelName1.Text = Foo.Bar1 //Inspecting Foo.Bar1 indicates my value is 2.9D WinForm.lblMockLabelName2.Text = Foo.Bar2 //Inspecting Foo.Bar2 also indicates I'm 2.9D So, what's the quirk? WinForm.lblMockLabelName1.Text displays as "2.9000", whereas WinForm.lblMockLabelname2.Text displays as "2.9". Now, everything I know about C# and VB indicates that the format of the string which was initially parsed into the decimal should have no bearing on the outcome of a later decimal.ToString() operation called on the same decimal. I would expect that decimal.Parse(someDecimalString).ToString() would return the string without any trailing zeroes. Everything I find online seems to corroborate this (there are countless Stack Overflow questions asking exactly the opposite...how to keep the formatting from the initial parsing). At the moment, I've just removed the trailing zeroes from the initial string that gets parsed, which has hidden the quirk. However, I'd love to know why it happens in the first place.

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