.net windows application

private Boolean dragInProgress = false;
int MouseDownX = 0;
int MouseDownY = 0;

private void label1_MouseUp(object sender, MouseEventArgs e)
        {
            if (e.Button == MouseButtons.Left)
            {
                this.dragInProgress = false;
            }
            return;
        }

private void label1_MouseDown(object sender, MouseEventArgs e)
        {
            if (!this.dragInProgress)
            {
                this.dragInProgress = true;
                this.MouseDownX = e.X;
                this.MouseDownY = e.Y;
            }
            return;

        }


private void label1_MouseMove(object sender, MouseEventArgs e)
       {
           if (dragInProgress)
           {
               Point temp = new Point();
               temp.X = this.label1.Location.X + (e.X - MouseDownX);
               temp.Y = this.label1.Location.Y + (e.Y - MouseDownY);
               this.label1.Location = temp;
           }
           return;
       }