private void button4_Click(object sender, EventArgs e)
{
Rect rect = new Rect
{
left = 50,
top = 50,
right = 110,
bottom = 110
};
bool result = Win32API.AdjustWindowRect(ref rect, WndStyle.WS_CAPTION | WndStyle.WS_BORDER | WndStyle.WS_SYSMENU, false);
}