how to clear gridview row values in asp.net

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C#

In gridview as follows

Room    Course               Room Course

11     LGTF                 21  EFA
       Edit(link Button)   Edit(link Button)

12     EFA                  22  REO
      Edit(link Button)    Edit(link Button)

for example when i click EDit(link Button) the dropdownlist will be shown in that select the room no from the dropdown and select the course from the dropdown and click the save button.

then in the gridview for the room no 11 selected course is displayed in the gridview for the room no 11. i select the course EFA course in the dropdown. in the gridview for room no 11 EFA is diplayed in the gridview.then in the room 21 EFA course is to be cleared in the gridview.

for that how can i do using csharp.


Rgds,
Narasiman P.