[02/03] Problem selecting first row in DataGrid

[amerif]

Good morning, all! Here's my problem: I have a normal datagrid that when a user selects a row, it will open up another form w/ details about the selected row. It all works fine except when I click on the very top of the datagrid (where the column names are displayed) - it gives me an error on my next form because current row index = 0. I can add an if to catch this, but then if the first data row is selected, it will not actually select the row. What am I doing wrong?

I would like for the users to click at the top of the datagrid to sort the data and also be able to select the first row in the datagrid. I can't seem to get both functions working properly.

Here's my code:

Private Sub productlist_MouseUp(ByVal sender As Object, ByVal e As System.Windows.Forms.MouseEventArgs) 
Handles productlist.MouseUp
If numclicks > 498 Then
            MessageBox.Show("You have selected too many items.")
        Else
            Try
 
                Dim pt = New Point(e.X, e.Y)
 
                Dim hti As DataGrid.HitTestInfo = productlist.HitTest(pt)
 
                If hti.Type = DataGrid.HitTestType.Cell Then
 
                    productlist.CurrentCell = New DataGridCell(hti.Row, hti.Column)
 
                    productlist.Select(hti.Row)
 
                    ProdID = Me.productlist.Item(Me.productlist.CurrentRowIndex, 0).ToString
                    
                End If
 
            Catch ex As Exception
                MessageBox.Show(ex.ToString)
 
            End Try
        End If
 
        'If productlist.CurrentRowIndex = 0 Then '= "" Then ' Then
        'productlist.CurrentRowIndex = 1
        'ProdID = ""
        'MessageBox.Show("Please select an item inside the grid.")
        'Else
            Dim myform As New productdetailform
            myform.Show()
        'End If
 
 
    End Sub

I can uncomment different parts of the if statement to get different behaviors in the datagrid, but I can not get it to where I can sort by clicking at the top AND select the first row of data.

Thanks for any and all help you folks can provide!