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• Printing and exporting from Crystal Reports Viewer throws error

  - by MAW74656

  I'm using the .net Crystal Reports viewer to display a report. This works properly, but when I click on the print option, and then click "OK" on the options popup, I get the following error: Access is denied. Description: An unhandled exception occurred during the execution of the current web request. Please review the stack trace for more information about the error and where it originated in the code. Exception Details: System.Runtime.InteropServices.COMException: Access is denied. And the same thing when I try to export. I'm running this on the Visual Studio development server, VS2008. What can I do to correct this?

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• How can I tell if a candidate is a good Sharepoint Architect / Developer ?

  - by driis

  I need to interview some people for a position as a Sharepoint Architect / Developer role. While I am proficient in .NET, I have worked very little with Sharepoint, so I am unsure how to test the candidates Sharepoint skills. Do you have any suggestions for tests I can throw at the candidates ? Please suggest questions I can ask the candidates; and please specify whether your question is "Must know" knowledge for a Sharepoint developer. Please include the answer to your question.

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• Puttting together binding navigators in a project

  - by vp789

  I am working on a group project in vb.net, in which all my team members are working on individual tables of a database. All of us are using binding navigator,where the GUI is created by drag and drop from the table. Is it possible to attach all these pieces together with imports or references? Will the changes made to the database while working on the program like table adapter can create problem? Do I need to make all those changes in database before importing ? Can you please give suggestions to put the project together.

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• Copying a 14bit grayscale image (saved in long[]) to a pictureBox

  - by Itsik

  My camera gives me 14bit grayscale images, but the API's function returns a long* to the image data. (so i'm assuming 4 bytes for each pixel) My application is written in C++/CLI, and the pictureBox is of .NET type. I am currently using the BitmapData.LockBits() mechanism to gain pointer access to the image data, and using memcpy(bmpData.Scan0.ToPointer(), imageData, sizeof(long)*height*width) to copy the image data to the Bitmap. For now, the only PixelFormat that is working is 32bit RGB, and the image appears in shades of blue with contours. Trying to initialize the Bitmap as 16bppGrayscale isn't working. I would ideally want to cast the array from long to word and using a 16bit format (hoping the the 14bit data will be displayed properly) but I'm not sure if this works. Also, I don't want to iterate over the image data, so finding the min/max and then histogram stretching to [0..255] isnt an option for me (the display must be as efficient as possible) Thanks

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• How to save email as draft in Outlook 2003 programmatically?

  - by Andrew

  I am working on an VB.NET app which constructs emails programmatically. This app can be used by different people at the same time so I thought that having a "central" email mailbox would be appropriate. The users would then have "links" (not sure of the correct term) to that central mailbox through their local copy of Outlook. I want to be able to save these emails so that all users can see the generated emails in the "Drafts" folder of their Outlook so that they can check the emails first for any errors and then send it off. I was originally simply talking directly to the Outlook app on the server using Microsoft.Office.Interop but have since read that it is not recommended for use in this sort of scenario. Any ideas?

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• Limiting the number of threads executing a method at a single time.

  - by Steve_

  We have a situation where we want to limit the number of paralell requests our application can make to its application server. We have potentially 100+ background threads running that will want to at some point make a call to the application server but only want 5 threads to be able to call SendMessage() (or whatever the method will be) at any one time. What is the best way of achieving this? I have considered using some sort of gatekeeper object that blocks threads coming into the method until the number of threads executing in it has dropped below the threshold. Would this be a reasonable solution or am I overlooking the fact that this might be dirty/dangerous? We are developing in C#.NET 3.5. Thanks, Steve

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• Best practice for using web services (ASP.MVC)

  - by eqiz

  Basically what I have is web services returning data in xml format. Once I do a call to a webservice to retrive data from web service function (GetUserList) i want to take that data and then dymaically display (no postback) the resulting information. I know several ways of doing this: webservice sends data back to javascript, javascript then parses, replaces strings or text inside a div or child, or take the information retrieved and then put it into html table format through javascript. Those are some of the idea's i've came up with, does anyone know the best practice to do this? Using ASP.MVC (.Net)

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• Classic ASP and MVC side-by-side, different projects?

  - by David Lively

  I've tried asking this in a few different ways, but let's give it another shot (as I've yet to receive an answer and this is driving me nuts!) I have a very large classic ASP 3.0 application (~350K lines) that I want to start migrating to ASP.NET MVC. I'd like to keep the old ASP files in a separate project from the MVC stuff. Ideas on how to debug these? Should I just dump the files in the same folder and create two different projects ( a WAP and an MVC app) that reference the relevant files and folders required by each? This should work, but does anyone have a better idea? I need the ability to migrate small parts of the application individually as this will probably take a year or two to complete.

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• Implementing a multi-state planner

  - by MoominTroll

  I've been asked to develop a system wherein employees can mark on a form their availability on a given day of the week - for instance an employee could mark themselves as available on a given time on a given week, and unavailable on some other time. It looks a little like this: Currently this works by rendering checkboxes within the table, picking up click events in each cell and marking the checkbox and hence the cell appropriately. I'm using the JQuery "click n drag checkbox" plugin from here. However, I've been informed that there could well be more than two states for a given cell (for instance available, unavailable, available in a given circumstance), in which case binding to a checkboxes checked value isnt going to be a lot of help. I've never used javascript or asp.net before and am unsure as to the best way to approach this problem. Ideally I could stick a data structure behind each cell which I could update to a certain state and then get my cell colour by binding to this - however I'm at something as a loss as how to best achieve this.

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• Format SQL Query Result into web menu

  - by highwingers

  I am trying to bhuild a drill down menu for my website, where user will click on a category and it will show the subcategories of that clicked category, there could be n-levels. I am able to write sql query which returns the output exactaly as I want, but the problem is...I dont want to show the whole menu to end user, I would like to open/expand only clicked category. my Query output is: 1 IPTV 2 Jadoo Tv 3 Shava Tv 4 Jalva Tv 5 Programming 6 Microsoft 7 Asp.Net 8 PHP so by default IPTV & Programming Should be displayed, since they are parent, and when I click on IPTV it should open the children of IPTV, like I said there could be n-levels. I was thinking, I can load the output of query to webpage and then control the menu navigation with css/javascript. do you guys have any ideas?

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• Dynamic Navigation

  - by Dooie

  I am building a project in asp.net 4.0. My navigation will be database driven where i return a datatable from the db containing all the pages of my site, some will be top level while others will be children and sometimes children of children n-times. Im thinking of going down the nested repeater route and databinding from code behind, dynamically generating repeaters for children, but have read that this is not a best practice and should consider the listview control. Im wanting to build a list of links using an unordered list. I cannot find a solid example and was hoping for some pointers/ideas. Thanks Doo

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• Programmatically login to a website and redirect the user to the logged in page?

  - by Santhosh

  Hi, Right now, I have all the employees of my company login to an external website using the company id, username and a password. We are trying to integrate it into an intranet portal which should provide seamless access to this website without requiring the user to enter these credentials. Is there any way of doing this programmatically (.NET C#)? Very similar to screenscraping, Can I simulate the appropriate POST action and then redirect the user to the logged in page? Any help is appreciated. Thanks.

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• Problems and solution for Developing a connected web and desktop application?

  - by Taz

  hi, I am trying to develop a web application(Using ASP.NET and c#) that uses a specific database hosted on web server. I will have another desktop application that will use a local database. Both databases have same structure and data at start up. Then databases will change when users add data to web application and an employee adds data to the desktop application. After a while I have to sync both databases. What will be best way to do this? Is there any opensource example/ starter kit to start with? Thanks.

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• Is it possible to capture a "file not found" from another process and then return a file to that pro

  - by Neil N

  I have a legacy application that looks for files in a directory. It does not handle missing files very well. What I want to do is "capture" the file not found errors, and send another file back to the calling app instead. Similar to how you could handle a 404 error on a webserver and return something based on what the requested URL was, except on the local file system. Is this possible? And more preferably, is it possible in .Net?

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• Start process from System Account with a specific User Name

  - by pavel.tuzov

  Hi, I'm developing a windows service in C# .net, Account: LocalSystem I want this service to check for all currently logged users if a specific application is running and if not - start this application AS corresponding user name. I provide domain, name, password, but Start() throws Win32Exception exception "Access is denied" process.StartInfo.Domain = domain; process.StartInfo.UserName = name; process.StartInfo.Password = password; process.StartInfo.FileName = fileName; process.StartInfo.UseShellExecute = false; process.Start(); The user whose credentials I provide is in administrator group - the application successfully runs if started manually. Is this accomplished in a different way? Thank you!

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• Insert into a generic dictionary with possibility of duplicate keys?

  - by Chris Clark

  Is there any reason to favor one of these approaches over the other when inserting into a generic dictionary with the possibility of a key conflict? I'm building an in-memory version of a static collection so in the case of a conflict it doesn't matter whether the old or new value is used. If Not mySettings.ContainsKey(key) Then mySettings.Add(key, Value) End If Versus mySettings(key) = Value And then of course there is this, which is obviously not the right approach: Try mySettings.Add(key, Value) Catch End Try Clearly the big difference here is that the first and second approaches actually do different things, but in my case it doesn't matter. It seems that the second approach is cleaner, but I'm curious if any of you .net gurus have any deeper insight. Thanks!

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• Get the BindingSource position based on DataTable row

  - by Ronald

  I have a datatable that contains the rows of a database table. This table has a primary key formed by 2 columns. The components are assigned this way: datatable - bindingsource - datagridview. What I want is to search a specific row (based on the primary key) to select it on the grid. I cant use the bindingsource.Find method because you only can use one column. I have access to the datatable, so I do manually search on the datatable, but how can I get bindingsource row position based on the datatable row? Or there is another way to solve this? Im using Visual Studio 2005, VB.NET.

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• Class library reference problem

  - by Anindya Chatterjee

  I am building a class library and using its default namespace as "System". There suppose I am creating a generic data structure say PriorityQueue and putting it under System.Collections.Generic namespace. Now when I am referencing that library from another project, I can't see PriorityQueue under "System.Collections.Generic" namespace anymore. Though the library is referenced I can not access any of the classes in it. Can anyone shed some light on it please. I know that if I change the namespace everything will be ok, but I want to create a seamless integration like .net framework itself with other project, so that one can refer the library and forget about its namespaces.

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• Bitfield With 3 States...?

  - by TheCloudlessSky

  I'm trying to create an authorization scheme for my ASP.NET MVC application where an Enum is used to set permissions. For example: [Flags] enum Permissions { ReadAppointments = 1, WriteAppointments = 2 | ReadAppointments, ReadPatients = 4, WritePatients = 8 | ReadPatients, ReadInvoices = 16, WriteInvoices = 32 | ReadInvoices ... } But I don't really like that because it really doesn't make it clear that Write always includes Read. I then realized that a requirement would be that a user might have NO access to, for example, Appointments. Essentially, I'd want a "bitfield" with 3 states: none, readonly, full (read/write). I'd like to still use an enum bitfield since it's easy to store in a DB (as an int). Also it's very easy to see if a permission is set. Does anyone have any idea how this could be easily accomplished using an Enum... or am I going in the completely wrong direction?

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• How do I access a DIV from javascript when using a master page?

  - by Rising Star

  I have a web page that contains a "div" element. On the page, there is javascript to reference the div: document.getElementById('divId'). This was working fine until another developer redesigned the page to use an ASP master page. Now, document.getElementById('divId') returns null. It appears that ASP.net prepends some characters to the names of elements within contents forms when you use a master page. How can I know what the id of the div is when the page loads? Update Allow me to give a specific example to clarify the question: My page had a div with ID divNotice. After changing my page to use a master page, I see when I print the source to the page that renders that the div ID is ctl00_ContentPlaceHolder1_divNotice. My question is, how am I supposed to know what the div ID is going to be when the framework is done with it?

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• Sending bulk notification emails without blocking

  - by FreshCode

  For my client's custom-built CRM, I want users (technicians) to be notified of changes to marked cases via email. This warrants a simple subscription mapping table between users and cases and automated emails to be sent every time a change is made to a case from within the logging method. How do I send 10-100 emails to subscribed users without bogging down my logging method? My SMTP server is on a peer on my LAN, so sends should be quick, but ideally this should be handled by an external queuing process. I can have a cron job send any outstanding emails every 10 minutes, but for this specific client cases are quite time-sensitive and instant notification (as instant as email can be) would be great. How can I send bulk notification emails from within ASP.NET MVC without bogging down my logging method?

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• Create DataGridView columns from Table values

  - by fireBand

  Hi, I am using data grid view to display items as excel spread sheet in VB.NET. I got a table named CostTypes with column names [CostTypeID, CostType] and values [1,External] and [2,Internal] (These are constant but more values can be added to table). I want to create columns with names of the values[External , Internal] in DataGridView. If I use databiding directly I get columns [CostTypeID,CostType] which is not what I am looking for. If some one could explain how to create columns at runtime in datagridview or how to retrieve data from data base using LINQ so that [External , Internal] turn out to be columns that would be great. Thanks in advance.

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• Displaying list of objects as single column in a bound gridview (Winforms)?

  - by Carrie Nelson

  I have a gridview that is bound to a datasource on a Windows Form (VB.NET). The grid displays a list of "certifications", and each "certification" can be associated with many languages. So in the grid, I'd like to display "languages" as a column, and display a comma delimited list of the language names for each "certification". In the "certification" class, one of the properties is a list of "language" objects, and each "language" has an ID (guid), name (string), and value (integer). So in the datasource, I have the list of "languages", but I can't figure out how to display them in a column on the grid. The gridview won't let me add the language list property as a column. So is the ONLY way to add a new property on the "certification" class, which returns a string that contains the comma delimited list, and show THAT on the grid? Or is there a way to display that list of "languages"?

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• Is there a buffer size attached to stdout?

  - by jameswelle

  I am trying to find some information on data limits related to stdout on Windows. I can't seem to find the information on MSDN. Is there a limit to how much data can be written to stdout? If so, what happens if the limit is reached? Is the data lost? If stdout is redirected (for example, by launching the process from .Net and using the ProcessStartInfo.RedirectStandardOutput property), does that have any effect on how much data can be written? As I read from the stdout stream in the calling process, does that affect the limitations? Are these limits related in any way to named pipes?

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• Fire only one Custom Validator at a time

  - by Lijo

  I have two Custom Validators attached to a textbox. The textbox is to enter comma separated list of emails. The first validator checks that there is not duplicate email address. The second custom validator checks that all the email addresses are in valid format. I have following code and it works fine. However, when both the failure criteria is met both of them are firing and I get two * at the right side of my textbox. What is the best approach to show only one * at a time? CODE <asp:CustomValidator ID="valEmailRecipients" runat="server" ControlToValidate="txtEmailRecipients" ClientValidationFunction="isUniqueElements" OnServerValidate="IsUniqueEmail_Validate" Text="*" ErrorMessage="There should be no duplicate email address for a report" ValidationGroup="Save"> </asp:CustomValidator> <asp:CustomValidator ID="valEmailFormat" runat="server" ControlToValidate="txtEmailRecipients" ClientValidationFunction="checkEmailFormat" OnServerValidate="IsValidEmailFormat_Validate" Text="*" ErrorMessage="Entries should be valid email addresses separated by comma" ValidationGroup="Save"> </asp:CustomValidator> REFERENCES: Validating with a Custom Function for ASP.NET Server Controls

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