C # Use APIs to change the program name

[DllImport ("user32.dll", EntryPoint = "FindWindow")]
Public static extern int FindWindow (
String lpClassName,
String lpWindowName
);

[DllImport ("user32.dll", EntryPoint = "SendMessage")]
Public static extern int SendMessage (
Int hwnd,
Int wMsg,
IntPtr wParam,
String lParam
);
Public const int WM_SETTEXT = 0xC;

Int hwnd = FindWindow (null, "untitled-Notepad ");
String s = "name to be modified ";
If (hwnd! = 0)
{
SendMessage (hwnd, WM_SETTEXT, IntPtr. Zero, s );
}
Else
{
MessageBox. Show ("Notepad is not running ");
}