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BenTam asked BenTam commented

Failed to load toolbox item 'Label'

Hi All,

I create a BaseControlLibrary.csproj and try to subclass all controls. However, when I move my user control 'Label' to a form. Visual Studio tells me that

"Failed to load toolbox item 'Label'. It will be removed from the toolbox."


Label Source Code

 using System;
 using System.Collections.Generic;
 using System.ComponentModel;
 using System.Data;
 using System.Drawing;
 using System.Linq;
 using System.Text;
 using System.Threading.Tasks;
 using System.Windows.Forms;
 namespace BaseControlLibrary
     public partial class Label : UserControl
         public Label()

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@BenTam, Welcome to Microsoft Q&A, based on my test, it works well for me. Could you tell me which template you used for the BaseControlLibrary class? I used the following template:

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BenTam avatar image BenTam JackJJun-MSFT ·

Hi @JackJJun-MSFT

The template that I used is "Windows Forms Control Library (.NET Framework)".

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BenTam avatar image BenTam JackJJun-MSFT ·

Hi @JackJJun-MSFT

Any new ideas about my question?

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@BenTam, Sorry for the late response, I think that maybe that our Control library is different. Could you upload your project to github and share the link here?

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JackJJun-MSFT avatar image
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JackJJun-MSFT answered BenTam commented

@BenTam, you could try the following steps to solve the unloaded problem first of all.

  1. Please open your NewTims.csproj and find the line 69.

  2. Please add the closed tag </Compile to the correct place.

    <Compile Include="BaseForm.Designer.cs">
    </Compile> -> Please add it

  3. Please open the solution NewTims and you find NewTims is normal.


Also, I find some errors when I rebuild the solution, you could make some changes.

First, Please add using Library; in the Student_Form class.

Second, Please add another parameter to avoid the error:

    Surname_textBox.Text = Lib.Item(s_Name, 1,"");
    GivenName_textBox.Text = Lib.Item(s_Name, 2,"");

Then, the project will rebuild without the problem.

As for the question Failed to load toolbox item 'Label', based on my test, I could not reproduce the problem. When I drag the label , button and label from the toolbox to the BaseForm, it will not show any errors.

Best Regards,

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Hi @JackJJun-MSFT

Thanks for your reply. It works!

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