ASP.net Gridview or Detailsview Get index number of column from header text

The following function will return the index number of a column in a gridview or detailsview control based on it's header text.  Just pass in the control and header text as parameters.

          ' Get field index by Header Text, works with both gridview and detailsview

Public Shared Function GetFieldIndexByHeader(ByVal _Control As Object, ByVal _HeaderText As String) As Integer
 
                If _HeaderText <> "" Then
 
                    Dim _Field As DataControlField
 
                    Select Case _Control.GetType.ToString
                        Case "System.Web.UI.WebControls.DetailsView"
 
                            For Each _Field In _Control.Fields
                                If _Field.HeaderText.ToLower = _HeaderText.ToLower Then
                                    Return _Control.Fields.IndexOf(_Field)
                                End If
                            Next
 
                        Case "System.Web.UI.WebControls.GridView"
 
                            For Each _Field In _Control.Columns
                                If _Field.HeaderText.ToLower = _HeaderText.ToLower Then
                                    Return _Control.columns.IndexOf(_Field)
                                End If
                            Next
 
                    End Select
 

                Else
 
                    Return -1
 
                End If
 
            End Function