Retrieve cell value

I have populated my grid with a dataset from a web service.
Now suppose if my customer double-clicks on a cell i want that cell value to be again passed to my database and retrieve another dataset on the other page.
I cannot even find a method to retrieve the cell value(i guess must be something like cell[i][j].getValue )
I am using asp.net

{object}.onCellClicked=function(event,c,r){

c=column
r=row

after that you can do a
{data}[c][r].value
to retrieve the content.