Error Creating Control Session State
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.NET with Beth Massi ASP.NET by Scott Hanselman OData Team WPF Platform Development Apps for Windows Bing Edge error creating control failed to create designer Microsoft Azure Office 365 Development Web Data Development SQL Server SQL Server Data Tools DocumentDB .NET Web Development and Tools Blog Your official information source from the .NET Web https://support.microsoft.com/en-us/kb/2024322 Development and Tools group at Microsoft. Another Error Creating Control in the Design View with Object Reference Not Set in Visual Studio 2010 ★★★★★★★★★★★★★★★ May 6, 2010 by Web Development Tools Microsoft // 11 Comments 0 0 0 In a previous blog, Controls State: "Error Creating Control" in the Design View in Visual Studio 2010, I have discussed https://blogs.msdn.microsoft.com/webdev/2010/05/06/another-error-creating-control-in-the-design-view-with-object-reference-not-set-in-visual-studio-2010/ about an Error Creating Control issue related to accessing the Session state in the OnInit() method. Since then, I have discovered that the Error Creating Control will also show in the design view if we try to access any object not being instantiated at the design time inside the OnInit() method. For example, in a web application project, in a code-behind file that is adding controls dynamically to a page, similar to what was discussed in the article How To Dynamically Add Controls to a Web Page , we have code that’s accessing an object that is null at the design time as shown below When you switch to the design view, you would see "Error Creating Control– xxx. Object reference not set to an instance of an object”, where xxx is a control on your page. Screen shot of the error is shown below A simple workaround for this issue would be to check if we are in the design mode at the top of the OnInit() method, below the
here for a quick overview of the site Help Center Detailed answers to any questions you might have Meta Discuss the workings and policies of http://stackoverflow.com/questions/13260670/visual-studio-2010-design-mode-error-creating-control-object-reference-not-set this site About Us Learn more about Stack Overflow the company Business Learn more about hiring developers or posting ads with us Stack Overflow Questions Jobs Documentation Tags Users Badges Ask Question x Dismiss Join the Stack Overflow Community Stack Overflow is a community of 4.7 million programmers, just like you, helping each other. Join them; it only takes a minute: Sign up VIsual error creating Studio 2010 Design Mode Error Creating Control (Object reference not set) up vote 0 down vote favorite Design mode has this problem site-wide since upgrading to .NET 4.0 / VS 2010 from 1.1 / 2003. There's plenty to google on this and I've tried it all. What am I missing? -Trying to debug from another instance of Visual Studio: Error Creating Control vs2010 error creating control MasterPage - there's not a whole lot of detail on how this is supposed to work. I started another empty instance of VS2010 and attached to devenv.exe. Set Debug->Break All. Switched to design mode in the website instance of VS. Ran the website instance of VS in debug mode. Nothing happens. I was hoping this could help because I DO have some user controls in the page. I can't find anything wrong with them though. Can I get more detail on how exactly to do this type of debugging? See the end of this post for the .aspx source. -Commented out some <% =Session["Username"]%> junk in the tag of the page, since apparently accessing session stuff could cause this -Checked the OnInit() method for dynamically adding controls or accessing uninstantiated objects. It's clean: #region Web Form Designer generated code override protected void OnInit(EventArgs e) { // // CODEGEN: This call is required by the ASP.NET Web Form Designer. // InitializeComponent(); base.OnInit(e); } ///