changing backround vb 2005

IDE : VS 2005
Platform : .NET 2.0
BackColor DataGridView Columns
I'm trying to set the backcolor of the columns of a datagridview based on the text entered into a textbox(txtPosit). First of all, this code works:
Code:
For Each column As DataGridViewColumn In Me.dgvMaster.Columns
If column.HeaderText = Me.txtPosit.Text Then
column.DefaultCellStyle.BackColor = Color.LightGray
End If
Next

The problem I'm having is formatting multiple columns based on the text that is NOT the name of one of the columns (This is a program to filter positions of a baseball database). One of the filter options is "Middle", and when this is selected, I would like to set the backcolor of the 2B and SS columns in the datagridview. Here's what I thought would work:

Code:
If Me.txtPosit.Text = "Middle" Then
For Each column As DataGridViewColumn In Me.dgvMaster.Columns
If column.HeaderText = "2B" Or column.HeaderText = "SS" Then
column.DefaultCellStyle.BackColor = Color.LightGray
End If
Next
End If