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[DllImport("User32.dll", EntryPoint = "SendMessage")]
private static extern int SendMessage(IntPtr hWnd, int Msg, IntPtr wParam, string lParam);
const int WM_GETTEXT = 0x000D;
const int WM_SETTEXT = 0x000C;
StringBuilder ret = new StringBuilder(256);
SendMessage(hWnd32, WM_GETTEXT, 100, ret);
MessageBox.Show(ret.ToString());