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.