Error Creating Control Session State Can
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Web Development and Tools Blog Your official information source from the .NET Web Development and Tools group at Microsoft. Another Error Creating Control in the Design View with Object Reference Not Set in Visual https://support.microsoft.com/en-us/kb/2024322 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 will also show in the 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/ 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.Net ASP.NET Forums Web Developer Checklist ASP.NET User Voice .NET Meetups Relamode Threaded Flat - newest to oldest Flat - oldest to newest Member chris.percival-oakwood-dc - 6/17/2010 6:16:51 AM https://devnet.kentico.com/forums/f47/fp15/t14917/error-creating-control-fix Error Creating Control - Fix I have recently converted my Kentico Web Site to a web application project (well worth doing BTW). One issue I started having after I converted is I would get an error on controls in the designer:Error Creating Control - Session state can only be used when error creating enableSessionState is set to ture.... etc.If you're building a template aspx page and you're deriving from CMS.UIControls.TemplatePage (as you should be), then you will get this error as TemplatePage is derived from AbstractCMSPage which accesses the session on init. The work around is to add the following code in your error creating control page:protectedoverridevoidOnInit(EventArgse){if(!DesignMode)base.OnInit(e);}This would be worth adding to the AbstractCMSPage code for Kentico v6.. :) Member chris.percival-oakwood-dc - 6/17/2010 6:18:44 AM RE:Error Creating Control - Fix Here's the microsoft blog entry on the issue:http://blogs.msdn.com/b/webdevtools/archive/2010/04/15/rendering-issue-in-visual-studio-2010-when-accessing-the-session-state-in-the-oninit-method.aspx Member chris.percival-oakwood-dc - 6/17/2010 6:19:25 AM RE:Error Creating Control - Fix Note this is a Visual Studio 2010 issue only.. Kentico Support kentico_jurajo - 6/17/2010 8:11:47 AM RE:Error Creating Control - Fix Hi,Thank you for sharing with this experience. I forwarded it to our developers so they can consider it for the next version.Best regards,Juraj Ondrus Top Sitemap Articles Authors Questions & Answers Download Documentation Support Marketplace Forums (Obsolete) Newsletter Archive Kentico Suite of Solutions Web Content Management solution E-Commerce solution Online Communities solution Intranet & Collaboration solution Online Marketing Solution Stay Connected Facebook Twitter Google+ RSS Feeds Developer Newsletter Your email Kentico Software Powered by Kentico, Copyright © 2004-2016 | Privacy