Question

public partial class Form1 : Form
{
   protected override void  WndProc(ref Message m)
   {
       base.WndProc(ref m);
   }
}

[STAThread]
static void Main()
{
    Application.EnableVisualStyles();
    Application.SetCompatibleTextRenderingDefault(false);
    Application.Run(new Form1());
}

When I ran the above code, it called the method protected override void WndProc(ref Message m)

When I changed the code like below

Form1 form1 = new Form1();
Application.Run();

it didn’t call the method protected override void WndProc(ref Message m)

Can any one explain me why is this happening?

Answer 1

When you call Application.Run() you are running the application without a form.

See
http://msdn.microsoft.com/en-us/library/system.windows.forms.application.run.aspx
for the difference.

The top one you are passing your form as a parameter to the Application.Run function call, which allows it to use your form, the second case it has no idea what form to use.