Formatting server side jQuery Datatable

public class TableParameter
{
    public string sEcho { get; set; }
    public int iDisplayStart { get; set; }
    public int iDisplayLength { get; set; }
    public int iSortingCols { get; set; } 
    public int iSortCol_0 { get; set; } // the first (and usually only) column to be sorted by
    public string sSortDir_0 { get; set; } // the direction of the first column sort (asc/desc)
    public int iSortCol_1 { get; set; } // the second column to be sorted by
    public string sSortDir_1 { get; set; } // the direction of the second column sort
    // etc
}

...
{ "sName": "category_image",
  "bSearchable": false,
  "bSortable": false,
  "mRender": function(data, type, full) {
     return '<img src="'+data+'" width="50" height="50" />'
  }
}
...