I dont have the title bar in my winform, so i need to code drag and drop for the entire form. I am using the below code to do it, which works fine. I have two panels in my form, PanelA and PanelB. During the startup i show PanelA where the drag and drop works perfectly. Later when the user clicks the button in PannelA, i need to make PanelA visible false and show the PanelB My drag and drop is not working when the PanelB is loaded in form. Whats the problem here ?

private void SerialPortScanner_MouseUp(object sender, MouseEventArgs e) { this.drag = false; }

    private void SerialPortScanner_MouseDown(object sender, MouseEventArgs e)
    {
        this.drag = true;
        this.start_point = new Point(e.X, e.Y);
    }

    private void SerialPortScanner_MouseMove(object sender, MouseEventArgs e)
    {
        if (this.drag)
        {
            Point p1 = new Point(e.X, e.Y);
            Point p2 = this.PointToScreen(p1);
            Point p3 = new Point(p2.X - this.start_point.X,
                                 p2.Y - this.start_point.Y);
            this.Location = p3;
        }
    }