How to programmatically click on cross button X c#

Question

i searched google lot to know how can i programmatically click on cross button X using c#. i got the below code which is used for different purpose.
private void Form1_FormClosing(object sender, FormClosingEventArgs e) {
if (string.Equals((sender as Button).Name, @"CloseButton"))
// Do something proper to CloseButton.
else
// Then assume that X has been clicked and act accordingly.
so anyone can tell me How to programmatically click on cross button for closing form. thanks

Answer 1

this is the code which i was looking for to close any sdi window programmatically.
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Hi MM2,
After I tested all of the following WM_XXX messages, I found one that works.
Code Snippet
public partial class Form1 : Form
private int WM_IME_NOTIFY = 0x0282;
private int WM_DESTROY = 0x0002;
private int WM_NCDESTROY = 0x0082;
private int WM_CLOSE = 0x0010;
private int IMN_CLOSESTATUSWINDOW = 0x0001;
private int WM_KILLFOCUS = 0x0008;
private int WM_COMMAND = 0x0011;
[DllImport("user32.dll", SetLastError = true)]
static extern IntPtr FindWindow(string lpClassName, string lpWindowName);
[DllImport("user32.dll", CharSet = CharSet.Auto)]
private static extern int SendMessage(IntPtr hwnd, int wMsg, int wParam, int lParam);
private void closeYesNoMBButton_Click(object sender, EventArgs e)
IntPtr handle = FindWindow(null, "YesNoMessageBox");
SendMessage(handle, WM_KILLFOCUS, 0, 0);
SendMessage(handle, WM_IME_NOTIFY, IMN_CLOSESTATUSWINDOW, 0);
SendMessage(handle, WM_COMMAND, 0, 0);
SendMessage(handle, WM_DESTROY, 0, 0);
SendMessage(handle, WM_NCDESTROY, 0, 0);