Изменение свойств чужого окна

......................
[DllImport("User32.dll")]
public static extern Int32 FindWindow(String lpClassName,String lpWindowName);
[DllImport("User32.dll")]
public static extern Boolean EnumChildWindows(int hWndParent,Delegate lpEnumFunc,int lParam);
[DllImport("User32.dll")]
[DllImport("user32.dll", CharSet = CharSet.Auto)]
 static extern int SendMessageA(IntPtr hwnd, int wMsg, int wParam, uint lParam);
 [DllImport("user32.dll", CharSet = CharSet.Auto)]
 public static extern IntPtr GetDlgItem(int hwnd, int childID);
...............
int hWnd;
public delegate int Callback(int hWnd,int lParam);
Callback myCallBack = new Callback(EnumChildGetValue);
hWnd = Win32.FindWindow(null,"CallingWindow");
EnumChildWindows(hWnd,myCallBack,0);
.........
public int EnumChildGetValue(int hWnd,int lParam)
{
IntPtr ptrTest = GetDlgItem(hwnd, intCID);
        SendMessageA(..............);
 
return 1;
}

            System.Diagnostics.Process[] process = System.Diagnostics.Process.GetProcesses();
            System.Diagnostics.Process target_proc = process.First(p => p.ProcessName == "Твой процесс");
            Text = target_proc.MainWindowTitle;