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Form1:
private void button1_Click(object sender, EventArgs e)
{
new Form2().ShowDialog();
}
Form2:
[DllImport("user32.dll")]
public static extern bool ReleaseCapture();
[DllImport("user32.dll")]
public static extern IntPtr SetCapture(IntPtr h);
private void Form2_Load(object sender, EventArgs e)
{
SetCapture(this.Handle);
}
private void Form2_FormClosing(object sender, FormClosingEventArgs e)
{
ReleaseCapture();
}
private void Form2_MouseUp(object sender, MouseEventArgs e)
{
Close();
}