كود :
Private Declare Function FindWindow Lib "user32" Alias "FindWindowA" (ByVal lpClassName As String, ByVal lpWindowName As String) As Integer
Private Declare Function FindWindowEx Lib "user32" Alias "FindWindowExA" (ByVal hWnd1 As Long, ByVal hWnd2 As Long, ByVal lpsz1 As String, ByVal lpsz2 As String) As Integer
Private Declare Function SendMessage Lib "user32" Alias "SendMessageA" (ByVal hwnd As Integer, ByVal wMsg As Integer, ByVal wParam As Integer, ByVal lParam As String) As Integer
Private Const WM_SETTEXT As Long = &HC
Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click
Dim WinWnd As Long
Dim BtnWnd As Long
WinWnd = FindWindow("WindowsForms10.Window.8.app.0.378734a", "ملاحظة")
If WinWnd <> 0 Then
BtnWnd = FindWindowEx(WinWnd, 0, vbNullString, "")
If BtnWnd <> 0 Then
SendMessage(BtnWnd, WM_SETTEXT, 0, "OK")
End If
End If
End Sub