How to rowFilter datagridview

See more:

C#

WinForms

Hi,
I have a combobox and a datagridview which i want to filter. In the combobox i have [Luft]and [Bus] But in the datagridview the column i want to filter looks like this:

[ColumnOne]
 AB
 AD
 AZ
 YA
 YD
 YZ

My thought is to group them like this
[AB,AD,AZ] = Luft and [YA,YD,YZ] = Bus
That means if i select Luft in the combobox, it should look through the datagridview and filter it like this:

Combobox           ColumnOne
[Luft]                AB
                      AD
                      AZ

That's my rowFilter code so far:

if (combobox1.SelectedItem != null)
   {
     try
       {
         //Check an see what's in the dgv
          DataView dv = new DataView(dt);
          dv.RowFilter = "[ColumnOne]  LIKE 'AB,AD,AZ" + combobox1.Text.Trim() + "%'";
                   datagridview1.DataSource = dv;
        }
    }

BUT it isn't working :(