winform 移动窗体

private void Form1_MouseDown(object sender, MouseEventArgs e)
{
if (e.Button==MouseButtons.Left)
{
this.Opacity = 0.5;
}
}

private void Form1_MouseUp(object sender, MouseEventArgs e)
{
this.Opacity = 1;
}

private void Form2_MouseDown(object sender, MouseEventArgs e)
{
if (e.Button==MouseButtons.Left)
{
this.Opacity = 50;
}
}

private void Form2_MouseUp(object sender, MouseEventArgs e)
{
this.Opacity = 100;
}

is this?