C# SetParent and Modal on different executables

I have two executables in C#, lets call them executable A and B, both of them have one form. Executable A gets the MainWindowHandle of B and then calls SetParent(this.Handle, B.M开发者_Go百科ainWindowHandle). How can I set the form of executable B to be a Modal so that the form of executable A wont receive input unless I close the form B. Something like when you do frm.ShowDialog(). Thank you very much.

Well, given AForm and BForm, I've created a test project which references another Winforms project (which contains BForm), and I can do this:

private void button1_Click(object sender, EventArgs e)
{
  var bForm = new WindowsFormApplication2.BForm();
  bForm.ShowDialog(this);
}

With or without passing in an IWin32Window owner property to the ShowDialog function, mine correctly forces modal on my BForm.

Can you show us some code?