how to add about form

Select Add New Item (right click on your project and select Add > Windows Form. Choose About Box from the installed templates (rename it from AboutBox1.cs to AboutBox.cs). Click Add.

To open it, add a menu item to your main form under Help > About. Double click the menu to create an event handler, and in that event handler enter the following code:

using (AboutBox dlg = new AboutBox())
{
  dlg.ShowDialog(this);
}

There you go, you've now got an About box - and it cleans up after itself as well.