Windows Forms
A set of .NET Framework managed libraries for developing graphical user interfaces.
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same as the question
You can do :
Form2 myForm2 = new Form2();
myForm2.StartPosition = FormStartPosition.Manual;
myForm2.Location = new Point(this.Bounds.Right, this.Bounds.Top);
myForm2.Show();
(there is a space between the 2 Forms because of DWM (DWM APIs otherwise...))