Another Error Creating Control in the Design View with Object Reference Not Set in Visual Studio 2010
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 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
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Read the complete post at http://blogs.msdn.com/webdevtools/archive/2010/05/06/another-error-creating-control-in-the-design-view-with-object-reference-not-set-in-visual-studio-2010.aspx