How do I add my new User Control to the Toolbox or a new Winform

Question

I have an existing library  not a Winforms application  that supplies some Winforms to a bona-fide Windows application   Within this library  I would like to create a User Control to group some controls together   To accomplish this  I right-clicked  Add  User Control and dragged some controls onto the new User Control     So far  so good   The User Control even has the requisite User Control icon   But dragging the new User Control from the Solution Explorer to a new blank Winform does not work  I get a circle with a line through it   and dragging it over to the Toolbox doesn t work either  even though I get a   sign when I drag it over the Toolbox    Is there some sort of XML magic or something else I m missing to make this work     Note  I had some problems with Visual Studio 2008 that I managed to fix by following the workarounds that can be found here   I am now able to get User Controls I added to my existing project into the toolbox by simply rebuilding the project

User · Answer

One way to get this error is trying to add a usercontrol to a form while the project is set to compile as x64. Visual Studio throws the unhelpful: "Failed to load toolbox item . It will be removed from the toolbox."

Workaround is to design with "Any CPU" and compile to x64 as necessary.

Reference: https://support.microsoft.com/en-us/kb/963017

User · Answer

Assuming I understand what you mean    If your UserControl is in a library you can add this to you Toolbox using   Toolbox -  right click -  Choose Items -  Browse  Select your assembly with the UserControl  If the UserControl is part of your project you only need to build the entire solution  After that  your UserControl should appear in the toolbox    In general  it is not possible to add a Control from Solution Explorer  only from the Toolbox

User · Answer

I found that user controls can exist in the same project  As others have mentioned  AutoToolboxPopulate must be set to True  Create the desired user control  Select Build Solution  If the new user control doesn t show up in the toolbox  close open Visual Studio  If the user controls still aren t showing up in the toolbox  right click on the toolbox and select Reset Toolbox  Then select Build Solution  If they still aren t there  restart Visual Studio   There must not be any build errors when the solution is built  otherwise new toolbox items will not be added to the toolbox

User · Answer

One user control can t be applied to it ownself  So open another winform and the one will appear in the toolbox

[c#] How do I add my new User Control to the Toolbox or a new Winform?

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