Improve DataGrid.RowHeaderStyle samples (#899)

* Update window1.xaml.cs

* Update window1.xaml.vb

* Update window1.xaml.vb

* Update window1.xaml.cs

Author: MSDN-WhiteKnight

snippets/csharp/VS_Snippets_Wpf/datagrid_rowheader/csharp/datagrid_rowheader/window1.xaml.cs

@@ -53,13 +53,11 @@ public object Convert(object value, Type targetType, object parameter, System.Gl
         {
             try
             {
-                //Get the DataRowView that is being passed to the Converter
-                System.Data.DataRowView drv = (System.Data.DataRowView)value;
                 //Get the CollectionView from the DataGrid that is using the converter
                 DataGrid dg = (DataGrid)Application.Current.MainWindow.FindName("DG1");
                 CollectionView cv = (CollectionView)dg.Items;
-                //Get the index of the DataRowView from the CollectionView
-                int rowindex = cv.IndexOf(drv)+1;
+                //Get the index of the item from the CollectionView
+                int rowindex = cv.IndexOf(value)+1;
 
                 return rowindex.ToString();
             }

snippets/visualbasic/VS_Snippets_Wpf/datagrid_rowheader/vb/datagrid_rowheader_vb/window1.xaml.vb

@@ -28,13 +28,11 @@ Public Class ConvertItemToIndex
 
     Public Function Convert(ByVal value As Object, ByVal targetType As System.Type, ByVal parameter As Object, ByVal culture As System.Globalization.CultureInfo) As Object Implements System.Windows.Data.IValueConverter.Convert
         Try
-            'Get the DataRowView that is being passed to the Converter 
-            Dim drv As System.Data.DataRowView = DirectCast(value, System.Data.DataRowView)
             'Get the CollectionView from the DataGrid that is using the converter 
             Dim dg As DataGrid = DirectCast(Application.Current.MainWindow.FindName("DG1"), DataGrid)
             Dim cv As CollectionView = DirectCast(dg.Items, CollectionView)
-            'Get the index of the DataRowView from the CollectionView 
-            Dim rowindex As Integer = cv.IndexOf(drv) + 1
+            'Get the index of the item from the CollectionView 
+            Dim rowindex As Integer = cv.IndexOf(value) + 1
 
             Return rowindex.ToString()