I have a gridview...I want to add a subtotal row to the gridview.....is there a way to do this?

Hello K,

In short, yes you can. Please take a look at our examples application --> RadGridView --> Group Summaries section. Don't hesitate to write me back if you have further questions.
 

Sincerely yours,
Nick
the Telerik team

How to show subtotal on each columns down.
I will have grouping on the down data.
For example
                        User                Tax                           Amount                            Sum Amount
                        ------                 ---                           ---------                             ---------------
                       Binesh             100                          10000                               10100
                       Suresh             200                          50000                               50100
                       Sreenath          100                          20000                               20100
                       ----------------------------------------------------------------------------------------------------
                                             TotTax:500             Tot Amount= 80000               Net Amount =80300