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Check the Form’s Inheritance
Make sure your form class inherits from System.Windows.Forms.Form. Open the .vb file (e.g., FrmLog.vb) and verify the class declaration looks like this:
Public Class FrmLog
Inherits System.Windows.Forms.Form
- If
Inherits System.Windows.Forms.Formis missing, add it manually. - Save the file and rebuild the project.
Ensure Designer File Exists
Check that the .Designer.vb file is present and correctly named:
- It should be named
FrmLog.Designer.vband located under the main form file in Solution Explorer. - If it's missing, you can:
- Right-click the form → Add → New Item → Windows Form → name it exactly as your form.
- Then copy your existing code into the new form Verify Project Target Framework The Windows Forms Designer in VS2022 works best with .NET Framework or .NET 6/7/8 (not .NET Core below 6):
- Right-click the project → Properties → check the Target Framework.
- If it's below .NET 6, consider upgrading to .NET 6 or higher. **Clean and Rebuild the Solution
- Close Visual Studio.
- Delete the
bin,obj, and.vsfolders from your project directory.- Reopen Visual Studio and rebuild the solution. **Check File Properties
- Right-click the form file → Properties.
- Ensure Build Action is set to
Compile.- Ensure Custom Tool is set to
VbMyFormGenerator(for VB.NET forms). Try Opening Designer Manually
- Right-click the
.vbfile → Open With → select Form Designer. - If it's not listed, click Add → browse to
devenv.exe(Visual Studio executable) and try opening it that way. **Create a New Form and Compare
- Compare its structure, inheritance, and file layout with the problematic form.
- This can help identify missing or misconfigured elements
- Ensure Custom Tool is set to
- Then copy your existing code into the new form Verify Project Target Framework The Windows Forms Designer in VS2022 works best with .NET Framework or .NET 6/7/8 (not .NET Core below 6):