Failed To Create Component The Error Message Follows
, .NET Framework > Visual C# Question 0 Sign in to vote I added UserControl1.cs (default User Control) to Class Library. I would like to use this user control in failed to create component constructor on type not found second project (Winforms app). When I'm adding user control to form (using drag&drop) designer failed to create component a reference to the component already exists in the project is showing following error: Failed to create component 'UserControl1'. The error message follows: 'System.NullReferenceException: Object reference not set to an instance of an object. at System.ComponentModel.Design.DesignerHost.CreateSite(IComponent component, String name) at System.ComponentModel.Container.Add(IComponent component, String name) ... Screenshot of full error:http://dl.dropbox.com/u/34289839/error.PNG Feel free to correct my english. I'll be grateful! urban.michal@o2.pl Edited by Michał Urban Sunday, March 04, 2012 10:21 AM Sunday, March 04, 2012 10:20 AM Reply | Quote Answers 0 Sign in to vote Hi Michal, I can add those controls into a form.. amazing problem :D :D Add simple a new Windows Form Aplication to your solution.. and add the reference of the Wizard class library project to the newly project. In that way it works to me :D I guess the problem is something with the Krok folder in your existing project (WizardAplication).. I tried it already to delete then execute a 'clean' command to the project and build.. then I was able to add your controls to the form for further problems don't hesitate with regards Muli :)If some code doesn't work, don't worry help is on the way.. don't forget to mark your thread as solved when done... Marked as answer by Michał Urban Sunday, March 04, 2012 2:15 PM Sunday, March 04, 2012 1:40 PM Reply | Quote All replies 2 Sign in to vote When a User Control won't load into the Visual Studio designer here is what you need to do. These instruction are for vb.net project but c# should be similar. Also, before doing this close all open windows (or at least the source and designer files of the control you are working on.) One last thing. The FIRST thing you should do is ensure that restarting visual studio doesn't fix the problem. If not you can try the steps that follow. These instructions assume that the errant user controls are in control library project in visual studio. If not you should be able to adjust the directions a bit to get it
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