how to find row index of drop down column value

[shanker bangari]

Hi

this shanker  am doing one project my requirement is I catcth the dropdowncloumn value of rowindex in itemcommand my sample code 

how to find that 

please let me it's argent

 if (e.CommandName == "Insert")

            {

                XElement xmlDoc = new XElement("process_bulk_load");

                long IDNO = 1;

                for (int i = 0; New_Fee_payment_grid.Items.Count > i; i++)

                {

                    CheckBox chk = New_Fee_payment_grid.Items[i].Cells[0].FindControl("allcheck") as CheckBox;

                    if (chk != null)

                    {

                        if (chk.Checked == true)

                        {

                            DropDownList student_name = ((DropDownList)New_Fee_payment_grid.Items[i].cells[1.control[0]]) as DropDownList;

                            if (student_name != null)

                            {

                            }

                        }

                    }

                }

            }

how to fine it's very argent I face this error 

Unable to cast object of type 'System.Web.UI.LiteralControl' to type 'Telerik.Web.UI.RadComboBox'.

thanks and regards

shanker.b

[O'Man]

Hi,
This Oman,
I am doing not project,
It is argent to read this link:

http://www.telerik.com/help/aspnet-ajax/grdaccessingcellsandrows.html

Thankings,
Oman