Jon Gallant's Blog : asp.net

Solution to the “You tried to assign the Null value to a variable that is not a Variant data type.” Exception

jongallant — Sun, 03 May 2009 04:15:00 GMT

By default the DataSource wizard passes parameters for AutoNumber primary keys. If you are getting this error: You tried to assign the Null value to a variable that is not a Variant data type. Then you need to remove that default parameter. This is what...(read more)

Solution to “Operation must use an updateable query” Exception when writing to an Access Database from ASP.NET

jongallant — Mon, 06 Apr 2009 20:58:00 GMT

Could be a couple of things: The file is marked as read-only. Right click on file, uncheck “read only”. The application pool identity doesn’t have write permissions to the folder that contains the MDB. Find the identity of the application pool (using...(read more)

Mobile Browser Detection in ASP.NET

jongallant — Sat, 04 Apr 2009 02:10:18 GMT

Before last week the only two viable Mobile Browser Detection options were: WURFL – Great for non-.NET solutions. .NET APIs lack support DeviceAtlas – Great for .NET solutions, but it’s starts at $99/server/year. DeviceAtlas claims to have...(read more)

Access Database Membership, Profile, Role and Personalization Providers for ASP.NET

jongallant — Sat, 14 Mar 2009 01:44:30 GMT

ASP.NET doesn’t ship with Membership, Profile, Role or Personalization providers out of the box. Imar Spaanjaars has a great article on how to setup a site using the “Sample Access Providers” provided by Microsoft. http://imar.spaanjaars.com/ http://imar.spaanjaars.com/QuickDocId.aspx?quickdoc=404...(read more)

The simplest DataSet to Excel solution

jongallant — Wed, 04 Mar 2009 09:51:58 GMT

Tim Mackey has a very simple method for converting DataSets to Excel spreadsheets. http://tim.mackey.ie/HowtoExportADatasetToExcelCAspnet.aspx Thanks Tim!...(read more)

Binding Hierarchical DataSets to TreeView Controls

jongallant — Tue, 24 Feb 2009 10:59:44 GMT

OOB the ASP.NET TreeView control doesn’t support binding to Hierarchical DataSets. Ralph Varjabedian created a HierarchicalDataSet class to help with this. Read more about it here . Here’s a snippet…it’s simple to implement: TreeView1.DataSource...(read more)

How to reuse TreeNodeCollection in Windows Forums apps

jongallant — Fri, 20 Feb 2009 00:30:21 GMT

I’m creating an app and need the same data set for two tree views. Nodes.AddRange only works with a TreeNode[] and the TreeNodeCollection is read-only and doesn’t have a ctor. I first tried something like this: TreeNode[] nodes = new TreeNode[treeView1.Nodes.Count];...(read more)

PDC Wrapup - My fav sessions

jongallant — Thu, 06 Nov 2008 02:54:00 GMT

PDC was great this year! Here's a quick list of my favorite sessions of technologies and products that Social Bookmarking will use soon... Stuff we'll use this year: Velocity ADO.NET Data Services Visual Studio 2010 C# 4.0 j Query MVC ASP.NET 4.0 ....Next...(read more)

Short and Sweet "Silverlight 2.0, LINQ and WCF in 5 Minutes" Video

jongallant — Thu, 17 Apr 2008 19:39:44 GMT

Download Source This is the first video in my new "Short and Sweet" video series. I'm going to continue with Silverlight, LINQ and WCF path for the series. Please ping me if you have an idea for a future video. This video takes you through the minimum...(read more)

LINQ and Web Application Connection Strings

jongallant — Sun, 25 Nov 2007 23:52:00 GMT

It's usually a good idea to seperate Biz Layer Objects and Data Access Objects into seperate assemblies, but when you do that and use LINQ to SQL (.dbml) files the DataContext object default ctor uses the Settings file that is automattically generated...(read more)

Binding Complex Properties to GridView

jongallant — Fri, 31 Aug 2007 01:12:00 GMT

Binding simple (int/string, etc) type properties to a TemplateColumn in a GridView is easy, but when you need to bind the Grid to an object that has properties that aren't simple types it gets a bit more complex. The Bind method only works with simple...(read more)

MSDN/TechNet is looking for senior Web Developers

jongallant — Wed, 13 Jun 2007 00:12:00 GMT

My team, MSDN/TechNet, is looking for 3 senior developers. This is a great opportunity to come help us innovate using latest Microsoft technologies. Please send your resume to ideodevj@microsoft.com to be considered for this position. MSDN and TechNet...(read more)

Running two different versions of ASP.NET on the same server

jongallant — Thu, 24 May 2007 21:15:00 GMT

I just installed Orcas and was getting this error when running a performance test: Event Type: Error Event Source: ASP.NET 2.0.50727.0 Event Category: None Event ID: 1062 Date: 5/24/2007 Time: 11:11:12 AM User: N/A Description: It is not possible to run...(read more)

Embedded MasterPage with VirtualPathProvider and Resource files

jongallant — Tue, 27 Mar 2007 19:35:00 GMT

Piyush Shah , a dev on my team, developed a way to embed MasterPages in assemblies using VirtualPathProvider and Resource files. It's a really slick way of reusing master pages for multiple applications. Read more here: http://blogs.msdn.com/shahpiyush/archive/2007/03/09/Sharing-Master-Pages-amongst-Applications-by-Embedding-it-in-a-Dll_2E00_.aspx...(read more)

Web Application Projects do not support dynamic Profile class generation

jongallant — Sun, 25 Mar 2007 21:45:00 GMT

I found out the hard way that Web Application Projects do not support dynamic class generation for profile providers. For now you need to use the "WebSite" type project instead of WAP or you can use this ASP.NET WebProfile Generator add-in . I'm trying...(read more)