Multiple Column sorting in GridView

I want to do multiple column sorting in Gridview using C#. Suppose if we have sort column A of table in desc order then after i need to sort column B then i want the order of column A will not be changed, it remains the same.

if i sort Col A in descending order then result will be 

but when i sort col B in ascending order i want the result like 

if you can see col A remains the same after col B sorting. Thanks

Regards

Nitin Yadav