Sorting in Radgrid control on server side

[pankaj]

I am unable to create the Filtering facility in radgrid control on server side with the same option as client side,

Please give me the sample code to apply the all the combination of the selected list of the columns for search criteria display in the radgrid (search option for each columns like contain, Not Contain, IsNull, NotNull etc,)

How to get the Filtering TextBox value with selected criteria(Less than, Greater Than, Contains, Not Contains etc)