C#

private bool Draged = false;
private int clickOffsetX;
private int clickOffsetY;

private void Sensor_MouseDown(object sender, MouseEventArgs e)
{
    if (e.Button == MouseButtons.Left)
    {
        this.Draged = true;
        clickOffsetX = e.X;
        clickOffsetY = e.Y;
    }
}

private void Sensor_MouseMove(object sender, MouseEventArgs e)
{
    if (this.Draged && e.Button.Equals(MouseButtons.Left))
    {
        this.Left += e.X - this.clickOffsetX;
        this.Top += e.Y - this.clickOffsetY;

    }
}

private void Form2_MouseDown(object sender, MouseEventArgs e)
{
    Button button1 = new System.Windows.Forms.Button();
    this.SuspendLayout();
    this.Controls.Add(button1);
    button1.MouseMove += new System.Windows.Forms.MouseEventHandler(this.button1_MouseMove);
    this.Capture = false; //Force the form to Release the Mouse!
    this.ResumeLayout(false);
}