Failed to load toolbox item 'Label'

Question

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()  
        {  
            InitializeComponent();  
        }  
    }  
}  
  

Answer 1

@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">
   <DependentUpon>BaseForm.cs</DependentUpon>
   </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,
Jack

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