In my DatagridView, Disable sorting of (id/ Sl.no) column when Sorting any column?

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WinForms

C#4.0

DataColumn SlCol = new DataColumn("#", typeof(System.Int32));
dtGetList.Columns.Add(SlCol);
SlCol.AutoIncrement = true;
SlCol.AutoIncrementSeed = 1;
Ex: Grid On FormLoad
sl.No Name
1 A
2 B
3 C
4 D
5 E
6 F

After Sorting Name Column

sl.No  Name
6       f
5       e
4       d
3       c
2       b
1       a

my required o/p is

sl.No  Name
1       f
2       e
3       d
4       c
5       b
6       a