inheritance generic form cannot be shown in designer

Question

I meet a problem today. As following.
I create a generic Form ,
public class Form1:Form
Then I create another inheritance form,
public class From2:Form1.

Answer 1

I had like to give a more concrete answer on as addition to the post of Adam.

BaseForm is the name of your generic form, GenericClass one of the possible type parameters.

BaseForm could look like this:

public class BaseForm : Form
{ }

First, you need the above base class. In fact this is the part you'd probably already used before bumping into this question.

Then you use this intermediate implementation.

public class SampleFormIntermediate : BaseForm
{
    public SampleFormIntermediate()
    {
        InitializeComponent();
    }
}

And you need to use this class for the Visual Studio designer. And only that. I would recommend to decorate this with a compiler directive so it only gets used in Debug mode:

public partial class SampleForm : SampleFormIntermediate
{
}

Using this Visual Studio 'understands' what to open in the designer and how to open it.