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  • Thread vs ThreadPool - .Net 2.0

    - by NLV
    Hello I'm not able to understand the difference between Thread vs ThreadPool. Consider i've to manipulate 50,000 records using threads. In case of threads i need to either predefine no of threads or no of records per threads. Either of them has to be constant. In case of threadpool we dont need to set any of them theoretically. But practically we need to assign the number of records per thread, because the no of threads may grow extremely large if the input no of records is huge. Any insights on this?

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  • ASP.NET - fast Segmented downoad of file through webservice

    - by H4mm3rHead
    Hi, Im doing this project where i need to download files through a webservice (images, videos). The download MUST go through an existing webservice. The existing webservice was made when there were no need to upload and download files but the project has changed and now we need to do It through a webservice. Right now I have implemented the download as a method that returns a byte[], I open a streamreader and resds the entire file into a byte[] and returns it to my method. This is working file on small files <~1Mb, above it takes too long time. I want to show some progress (e.g. when the user downlaods a 20Mb video) which i cannot do right now. And i want to make it download much faster (is a strategy to use multithreading and several threads that downloads a part of the file?). It is within a WPF application i need to do this. Any ideas on how to approach this?

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  • vb.net -- Using arraylist as key in dictionary

    - by Zahid
    Dim dct As New Dictionary(Of ArrayList, ArrayList) ' Populate Dictionary dct.Add(New ArrayList({"Dot", "0"}), New ArrayList({20, 30, 40, 50})) dct.Add(New ArrayList({"Dot", "1"}), New ArrayList({120, 130, 140, 150})) ' Search in dictionary Dim al As New ArrayList({"Dot", "2"}) If dct.ContainsKey(al) Then *' does not work* MessageBox.Show("Found: " & al(0).ToString) End If

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  • Hitting a memory limit slows down the .Net application

    - by derdo
    We have a 64bit C#/.Net3.0 application that runs on a 64bit Windows server. From time to time the app can use large amount of memory which is available. In some instances the application stops allocating additional memory and slows down significantly (500+ times slower).When I check the memory from the task manager the amount of the memory used barely changes. The application keeps on running very slowly and never gives an out of memory exception. Any ideas? Let me know if more data is needed.

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  • Manipulating / Resizing / Scaling an image in vb.net

    - by Christian Payne
    Imagine I have a rectangle say 400px x 300px. Then let’s say I want to load an image in that. All of this is very easy using Sytem.Drawing.DrawImage. But then I want to leave the left hand side as 300px but change the right hand side to 250 px. I can draw the box using 4 DrawLines but I don’t know how to squash the image into the new shape. I want the right hand side of the shape to be 250, the left size 300 and the top and bottom 400px. I can’t use DrawImage as it expects the left and right sizes to be the same. Is there a way to manipulate the image into the new shape? I've looked at other questions, but they only apply where the left and right hand side is equal. Any thoughts on how to squash an image into a shape which did not have parallel sides? (If it helps, I'm happy to sacrifice image quality to fit the right shape.)

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  • Asp.Net MVC best way to update cached table

    - by Eddy Mishiyev
    There are certain tables that get called often but updated rarely. One of these tables is Departments. So to save DB trips, I think it is ok to cache this table taking into consideration that the table has very small size. However, once you cached it an issue of keeping the table data fresh occurs. So what is the best way to determine that the table is dirty and therefore requires a reload and how that code should be invoked. I look for solution that will be scalable. So updating the cache right after inserting will not work. So if one machine inserted the record all other on network should get notified to reload the cache. I was thinking for calling corresponding web service from T-SQL but don't really like the idea of consuming recourses on sql server. So what are the best practices to resolve this type of problems. Thanks in advance Eddy

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  • Please Help me to create a replace function in vb.net

    - by Rajesh Rolen- DotNet Developer
    Please Help me in creating a replace function. Problem: Their is a alfanumeric value of any lenght (string) and i want to replace its all characters with 'X' except right four characters Like : Value : 4111111111111111 Result Should be: XXXXXXXXXXXX1111 I have created a function but got stuck: public function myfunction(str as string) str.Replace(str.Substring(0, str.Length - 5), 'X') 'but here i want no of x to be equvals to count of lenght of str - 4 end function please tell me a better fuction to perform such a operation

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  • .NET Conditional Callback on a type.

    - by Mahesh
    I have a stock price which changes by nature all the time. And, there will be many users who wants to buy that stock. Let's say that the stock price is started at 10 and let's say, 30 people bid for 10.98, 20 people bid for 7.45, 100 people bid for 8.99. During the day, the stock price can touch any of these values, and if that happens, I want to execute all the orders for users who quoted that price. Technically, I am storing in a List. Whenever the price changes, I am checking against all the values in the list and executing those that satisfy the quoted price. Class Bids { string stockname; double quote; } Is there any better alternative way to callback the satisfied items in the list rather than checking all the items whenever there is a change?? If storing in a list is not right way of doing it, let me know the best way.

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  • Adding controls dynamically at design time vb.net

    - by chris
    I have been developing some custom smart tags. I am using a DesignerActionMethodItem which gets me to a fired method in code. When I try to hit the controls.Add the control is added but it seems the designer is unaware of it. It is never serialized and it goes away when the form is refreshed in the designer. Any help would be greatly appreciated. I am sort of stuck and google hasn't helped me. Please don't send me anything about smart tags that has nothing to do with adding controls dynamically at design time, I have already read so many looking for this.

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  • Caching issue with javascript and asp.net

    - by Ed Woodcock
    Hi guys: I asked a question a while back on here regarding caching data for a calendar/scheduling web app, and got some good responses. However, I have now decided to change my approach and stat caching the data in javascript. I am directly caching the HTML for each day's column in the calendar grid inside the $('body').data() object, which gives very fast page load times (almost unnoticable). However, problems start to arise when the user requests data that is not yet in the cache. This data is created by the server using an ajax call, so it's asynchronous, and takes about 0.2s per week's data. My current approach is simply to block for 0.5s when the user requests information from the server, and cache 4 weeks either side in the inital page load (and 1 extra week per page change request), however I doubt this is the optimal method. Does anyone have a suggestion as to how to improve the situation? To summarise: Each week takes 0.2s to retrieve from the server, asynchronously. Performance must be as close to real-time as possible. (however the data is not needed to be fully real-time: most appointments are added by the user and so we can re-cache after this) Currently 4 weeks are cached on either side of the inial week loaded: this is not enough. to cache 1 year takes ~ 21s, this is too slow for an initial load.

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  • ASP.net looping through table

    - by c11ada
    hey all, i was wondering if any one could help me out, i have a table which looks something like the following <table id="Table1" border="0"> <tr> <td><b>1.</b> Question 1</td> </tr><tr> <td style="border-width:5px;border-style:solid;"></td> </tr><tr> <td align="left" style="width:1000px;"><input id="Radio1" type="radio" name="Group1" value="Radio1" /><label for="Radio1">Answer1</label></td> </tr><tr> <td align="left" style="width:1000px;"><input id="Radio1" type="radio" name="Group1" value="Radio1" /><label for="Radio1">Answer2</label></td> </tr><tr> <td align="left" style="width:1000px;"><input id="Radio1" type="radio" name="Group1" value="Radio1" /><label for="Radio1">Answer3</label></td> </tr><tr> <td align="left" style="width:1000px;"><input id="Radio1" type="radio" name="Group1" value="Radio1" /><label for="Radio1">Answer4</label></td> </tr><tr> <td style="height:30px;"></td> </tr><tr> <td><b>2.</b> Question 2</td> </tr><tr> <td style="border-width:5px;border-style:solid;"></td> </tr><tr> <td align="left" style="width:1000px;"><input id="Radio2" type="radio" name="Group2" value="Radio2" /><label for="Radio2">yes</label></td> </tr><tr> <td align="left" style="width:1000px;"><input id="Radio2" type="radio" name="Group2" value="Radio2" /><label for="Radio2">no</label></td> </tr><tr> <td style="height:30px;"></td> </tr> </table> how do i go about looping through each group of radio buttons and getting the text of the selected radio button ?? thanks a lot !!

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  • Problem with CruiseControl.net configuration

    - by Pawel
    Hi I started using ccnet to build my project. This is quite new issue for me so I have some problems. First thing: Why does ccnet copy directory with my project to another directory (ccnet creates new folder named the same as project name included in ccnet.config file and copies to them directory with my project) Second thing: Dashboard page cannot show reports for recent build (When I click on any item in recent build then I get page: "The page Cannot be found" I suppose that page cannot link files with logs. but I don't know how to link it. I create one publisher: <publishers> <xmllogger logDir="c:\Branches" /> Can anyone help me?

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  • ASP.Net MVC ActionLink's and Shared Hosting Aliased Domains

    - by Peter Meyer
    So, I've read this and I've got a similar issue: I have a shared hosting account (with GoDaddy, though that's not exactly relevant, I believe) and I've got an MVC (RC1) site deployed to a sub-folder which where I have another domain name mapped (or aliased). The sub-folder is also setup as an application root as well. The site works without issue, the problem is that I don't like the links that are being generated using Html.ActionLink and Ajax.ActionLink. It's inserting the sub folder name as part of the URL as described in this other question. Thing is, the site works fine, but I'd like to make the links generated relative to the domain name. To use an example: http://my.abc.com "primary" domain; maps to \ on file system http://my.xyz.com setup to map to \_xyz.com folder on file system My generated links on xyz.com look like this: Intended Generated -------- --------- http://my.xyz.com/Ctrller/Action/52 http://my.xyz.com/_xyz.com/Ctrller/Action/52 and, FWIW, the site works. So, the question: Is there something I can do to get rid of that folder name in the links being generated? I have a couple of brute force ideas, but they aren't too elegant.

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  • ValidatorCallout(asp.net ajax) and CheckListBox

    - by TJ
    Hi, Just wondering if anyone has a good solution to utlise ValidatorCallout with a CheckListBox ? The only solution I could see was creating a custom RequiredFieldValidator as per http://www.4guysfromrolla.com/ASPScripts/PrintPage.asp?REF=%2Fwebtech%2Ftips%2Ft040302-1.shtml. If anyone has any good solution, it would be appreciated if you could share it. thanks

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  • Get all folder / directories list in VB.net

    - by Henry
    Hi, this is my first Stackoverflow question, im learning VB and having a few problems with getting a list of all folders/directories on the system, im using the code included here and it seems to work until it hits the recycle bin folder, and some other system folders Sub main() Dim DirList As New ArrayList GetDirectories("c:\", DirList) For Each item In DirList 'add item to listbox or text etc here Next End sub End Sub Sub GetDirectories(ByVal StartPath As String, ByRef DirectoryList As ArrayList) Dim Dirs() As String = Directory.GetDirectories(StartPath) DirectoryList.AddRange(Dirs) For Each Dir As String In Dirs GetDirectories(Dir, DirectoryList) Next End Sub Can anyone help me with this, id like to know what is causing this first, and a good fix, or alternative way to do this. Thanks in advance.

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  • Login time out when calling opening a new window from modal popup (ASP.NET)

    - by Harsh Shah
    I have a weird problem. I have a window, on a button click I open a modal popup (using ModelPopupExtender), that let's you select a few criteria and then click a submit button. On click of submit button, I open a new window (using window.open()) that shows the status of what happened to your submitted request. However, every time this status window is opened, it goes to the login page. I am thinking the modal popup can't pass the authentication cookie to the newly opened window, but I'm not sure. Here's my web.config portion:

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  • ASP.NET MVC Patterns

    - by Sam Striano
    Hello, I am fairly new to MVC, but after playing with it (MVC 3/Razor), I am hooked. I have a few questions: 1) What is the best, or most widely used pattern to develop MVC apps in? Repository, DDD, UOW? 2) I am using the Entity Framework 4, so could some please explain to me or point me to a good source that will explain the Repository Pattern w/EF4? Doesn't EF4 take place as the business layer and the data access layer? Does the Repository Pattern even provide a benefit? 3) Also, one last question, could someone explain the whole relationship between the Controller, the Model and the View? I get the basics, but maybe a little more in depth of the correct way to use it. View Models - Say I have a view that displays customer info, and one that edits it, should I have a view model and an edit model, or can the be passed around? 4) Examples?? Thanks for the help up front, $("Sam") ** EDIT ** Am I on the right track here: Public Class HomeController Inherits System.Web.Mvc.Controller Function Index(ByVal id As Integer) As ActionResult Return View(New HomeModel) End Function <HttpPost()> _ Function Index(ByVal Model As HomeModel) As ActionResult Return View(Model) End Function End Class Public Class HomeModel Private _Repository As IRepository(Of Customer) Public Property Customer As Customer Public Sub New() End Sub Public Sub New(ByVal ID As Integer) _Repository = New CustomerRepository Customer = _Repository.GetByID(ID) End Sub End Class Public Interface IRepository(Of T) Function GetByID(ByVal ID As Integer) As T Sub Add(ByVal Entity As T) Sub Delete(ByVal Entity As T) End Interface Public Class CustomerRepository Implements IRepository(Of Customer) Public Sub Add(ByVal Entity As Customer) Implements IRepository(Of Customer).Add End Sub Public Sub Delete(ByVal Entity As Customer) Implements IRepository(Of Customer).Delete End Sub Public Function GetByID(ByVal ID As Integer) As Customer Implements IRepository(Of Customer).GetByID Return New Customer With {.ID = ID, .FirstName = "Sam", .LastName = "Striano"} End Function End Class Public Class Customer Public Property ID As Integer Public Property FirstName As String Public Property LastName As String End Class

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  • How to open the download window when a dynamically created link is clicked in asp.net

    - by Ranjana
    i have stored the txtfile in the database.i need to show the txtfile when i clik the link. and this link has to be created dynamically. my code below: aspx code: aspx.cs protected void Page_Load(object sender, EventArgs e) { if(!Page.IsPostBack) { DataTable dtassignment = new DataTable(); dtassignment = serviceobj.DisplayAssignment(Session["staffname"].ToString()); if (dtassignment != null) { Byte[] bytes = (Byte[])dtassignment.Rows[0]["Data"]; //download(dtassignment); } divlink.InnerHtml = ""; divlink.Visible = true; foreach (DataRow r in dtassignment.Rows) { divlink.InnerHtml += "<a href='" + "'onclick='download(dtassignment)'>" + r["Filename"].ToString() + "</a>" + "<br/>"; } } } - public void download(DataTable dtassignment) { System.Diagnostics.Debugger.Break(); Byte[] bytes = (Byte[])dtassignment.Rows[0]["Data"]; Response.Buffer = true; Response.Charset = ""; Response.Cache.SetCacheability(HttpCacheability.NoCache); Response.ContentType = dtassignment.Rows[0]["ContentType"].ToString(); Response.AddHeader("content-disposition", "attachment;filename=" + dtassignment.Rows[0]["FileName"].ToString()); Response.BinaryWrite(bytes); Response.Flush(); Response.End(); } i have got the link dynamically, but i did not able to download the txtfile when i clik the link. how to carry out this. pls help me out...

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  • VB.NET: Scrollbar "button"?

    - by Omega
    I plan on using a scrollbar for, well, scrolling an image. The image is 200x500, however, the only visible area is 200x250. So I set the max value to 250, and the min value to 0. The idea is that if I drag the scrollbar's button to the bottom, 250 pixels will have moved for the image, right? But wait, the scrollbar's button is.... very small. And the scrollbar is actually pretty long. Is there a way to make the scrollbar's button longer?

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