prevent error when clicking on control buttons

app/DD_Clipboard_Searcher/ctrlApplicationAssignment.vb

@@ -7,10 +7,10 @@ Imports DigitalData.Controls.RegexEditor
 Imports DigitalData.Modules.Windows.Window
 
 Public Class ctrlApplicationAssignment
-    Public SelectedProfileId As Integer = 0
-    Public SelectedProcessId As Integer = 0
-    Public SelectedWindowId As Integer = 0
-    Public SelectedControlId As Integer = 0
+    Public Property SelectedProfileId As Integer = 0
+    Public Property SelectedProcessId As Integer = 0
+    Public Property SelectedWindowId As Integer = 0
+    Public Property SelectedControlId As Integer = 0
 
     Private Sub ctrlApplicationAssignment_Load(sender As Object, e As EventArgs) Handles Me.Load
         TBCW_PROFILE_PROCESSTableAdapter.Connection.ConnectionString = MyConnectionString
@@ -352,6 +352,7 @@ Public Class ctrlApplicationAssignment
         MyDataset.TBCW_PROF_REL_WINDOW.Clear()
 
         If e.FocusedRowHandle < 0 Then
+            SelectedProcessId = 0
             Exit Sub
         End If
 
@@ -377,17 +378,18 @@ Public Class ctrlApplicationAssignment
     Private Sub GridView_Window_FocusedRowChanged(sender As Object, e As Views.Base.FocusedRowChangedEventArgs) Handles GridView_Window.FocusedRowChanged
         Try
             If e.FocusedRowHandle < 0 Then
+                SelectedWindowId = 0
                 Exit Sub
             End If
 
             Dim oSelectedRow As DataRow = GridView_Window.GetDataRow(e.FocusedRowHandle)
             Dim oWindowId As String = oSelectedRow.Item("GUID")
 
+            SelectedWindowId = oWindowId
+
             If Control_Load() = False Then
                 MsgBox($"Error while loading controls for window {oWindowId}", vbCritical, "")
             End If
-
-            SelectedWindowId = oWindowId
         Catch ex As Exception
             MsgBox(ex.Message, MsgBoxStyle.Critical)
         End Try
@@ -395,7 +397,7 @@ Public Class ctrlApplicationAssignment
 
     Private Sub GridView_Control_FocusedRowChanged(sender As Object, e As Views.Base.FocusedRowChangedEventArgs) Handles GridView_Control.FocusedRowChanged
         If e.FocusedRowHandle < 0 Then
-            SelectedControlId = Nothing
+            SelectedControlId = 0
             Exit Sub
         End If
 

app/DD_Clipboard_Searcher/frmAdministration.vb

@@ -679,6 +679,10 @@ Public Class frmAdministration
     End Sub
 
     Private Sub BarButtonItem24_ItemClick(sender As Object, e As DevExpress.XtraBars.ItemClickEventArgs) Handles BarButtonItem24.ItemClick
+        If CtrlApplicationAssignment1.SelectedControlId = 0 Then
+            Exit Sub
+        End If
+
         If MsgBox($"Wollen Sie die Feld-Zuordnung löschen?", MsgBoxStyle.Exclamation Or MsgBoxStyle.YesNo, Text) = MsgBoxResult.No Then
             Exit Sub
         End If
@@ -691,6 +695,10 @@ Public Class frmAdministration
     End Sub
 
     Private Sub BarButtonItem25_ItemClick(sender As Object, e As DevExpress.XtraBars.ItemClickEventArgs) Handles BarButtonItem25.ItemClick
+        If CtrlApplicationAssignment1.SelectedControlId = 0 Then
+            Exit Sub
+        End If
+
         If CtrlApplicationAssignment1.Control_SaveAssignment() = False Then
             MsgBox("Error while saving control", MsgBoxStyle.Critical, Text)
         Else
@@ -699,6 +707,10 @@ Public Class frmAdministration
     End Sub
 
     Private Sub BarButtonItem27_ItemClick(sender As Object, e As DevExpress.XtraBars.ItemClickEventArgs) Handles BarButtonItem27.ItemClick
+        If CtrlApplicationAssignment1.SelectedControlId = 0 Then
+            Exit Sub
+        End If
+
         If CtrlApplicationAssignment1.Control_EditAssignment() = False Then
             MsgBox("Error while saving control", MsgBoxStyle.Critical, Text)
         Else
@@ -716,8 +728,4 @@ Public Class frmAdministration
             MsgBox("Profile has been duplicated. Please check the dependencies!", MsgBoxStyle.Information)
         End If
     End Sub
-
-    Private Sub GridViewProfiles_FocusedRowChanged(sender As Object, e As DevExpress.XtraGrid.Views.Base.FocusedRowChangedEventArgs) Handles GridViewProfiles.FocusedRowChanged
-
-    End Sub
 End Class