BordlessForm

//MADE BY PAREX |PEOPLE GIVING U THIS LINK IS COPY RIGHT
Mouse Move Event
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if (e.Button == MouseButtons.Left)
            {
                this.Left += e.X - lastPoint.X;
                this.Top += e.Y - lastPoint.Y;
            }

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Mouse Down Event
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lastPoint = new Point(e.X, e.Y);

Declare variable as shown in the video
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Point lastPoint;