Error Creating Control Object Reference In Visual Studio 2010
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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 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 error creating control unknown server tag 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 base.OnInit() call.
This is a bug in VS 2010 that we’re now calling the OnInit() method at the design time; we are considering a fix for this in a future release of Visual Studio. Thank you, -Anh Visual Web Developer Team Back totop Search this blog Search all blogs ASP.NET Resources www.ASP.Nehere for a quick overview of the site Help Center Detailed answers to any questions you might have Meta Discuss the workings and policies of this site About Us Learn more
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about Stack Overflow the company Business Learn more about hiring developers or posting ads error creating control gridview1 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 Studio 2010 Design Mode Error Creating Control (Object reference not set) 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/ 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 MasterPage - there's not a whole lot of detail on how this is supposed to work. I started http://stackoverflow.com/questions/13260670/visual-studio-2010-design-mode-error-creating-control-object-reference-not-set 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); } ///
ASP.NET Community Standup Forums Help Home/ASP.NET Forums/General ASP.NET/Visual Studio and Visual Web Developer Express/Yet another "Error Creating Control - Object reference not set to an... Yet another "Error Creating Control - Object reference not set to an instance of an http://forums.asp.net/t/1555967.aspx?Yet+another+Error+Creating+Control+Object+reference+not+set+to+an+instance+of+an+object+problem object" problem RSS 1 reply Last post May 09, 2010 04:15 AM by gerardvandeven https://www.mojoportal.com/Forums/Thread.aspx?pageid=5&t=8198~-1 ‹ Previous Thread|Next Thread › Print Share Twitter Facebook Email Shortcuts Active Threads Unanswered Threads Unresolved Threads Support Options Advanced Search Related Links Guidance Reply gerardvandev... Member 11 Points 28 Posts Yet another "Error Creating Control - Object reference not set to an instance of an object" probl... May 08, 2010 07:29 PM|gerardvandeven|LINK Hi, I have just migrated from VS error creating 2008 to VS 2010 and have converted a couple of mysolutions to VS2010. On allpages ofall projects on theseASP.NET webpages I am gettingthe "Error Creating Control" errors.These are just simple static controlslike
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