Editing javascript datatable in asp.net

See more:

.NET

DataTable

I have generated javascript datatable in asp.net. I have brought data using webservice. It is displaying perfectly. I have made the cells editable. But I don't know how to write code for editing. My code is as follows

$('#showData').dataTable().makeEditable({
            "bDestroy": true,
            "sPaginationType": "full_numbers",
            sUpdateURL: "UpdateData.cs"
    "aoColumns": [
                   null,
                   null,
                   null,
                   {
                       indicator: 'Saving Payment Clearance Date...',
                       tooltip: 'Click to edit platforms',
                       type: 'textarea',
                       submit: 'Save changes',
                   }
            ]
        });

I just want to update last column on save button click. Now my question is where to impelement UpdateData.cs? Shall I make a class file? How to pass value and row id in that function? Google shows links about php and .net MVC only.
Please help