C# PictureBox Mouse Move

private bool click_ = false;

private Point click_point_ = new Point();

public void PictureBox_MouseDown(object sender, MouseEventArgs e)

{

if (e.Button == MouseButtons.Left && click_ == false)

{

click_ = true;

click_point_.X = e.X;

click_point_.Y = e.Y;

}

}

public void PictureBox_MouseUp(object sender, MouseEventArgs e)

{

click_ = false;

click_point_.X = 0; click_point_.Y = 0;

}

public void PictureBox_MouseMove(object sender, MouseEventArgs e)

{

if ( e.Button == MouseButtons.Left && click_ == true)

{

this.Left += e.X - click_point_.X;

this.Top += e.Y - click_point_.Y;

}

}

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