getting selected row id and read the data.

Getting the selected item:

protected void approvalsubmit_Click(object sender, EventArgs e)
        {      

           
            foreach (GridViewRow gvrow in orderapproved.Rows)
            {
                //CheckBox chkChild = (CheckBox)gvrow.FindControl("chkChild");
                CheckBox chkChild = (CheckBox)gvrow.FindControl("chkChild");

               
                if (chkChild.Checked == true)
                {
                    string skucode = gvrow.Cells[10].Text;
                    Guid chid = new Guid();//Guid.Empty();
                    chid = new Guid(skucode);


                    ColumnSet colu = new ColumnSet(true);
                    var orderdetails = service.Retrieve("salesorder", chid, colu);
                    orderdetails["new_venderorderstatus"] = "Accepted";
                    service.Update(orderdetails);
                  
                }

            }


for pagination:
give the coding in c # :
 protected void ordershipped_PageIndexChanging(object sender, GridViewPageEventArgs e)
        {

            ordershipped.PageIndex = e.NewPageIndex;
            ordershipped.DataBind();
           
         
        }

<asp:GridView ID="ordershipped" runat="server" AllowPaging="True" 
        OnPageIndexChanging="ordershipped_PageIndexChanging">

getting radgrid data:

foreach (Telerik.Web.UI.GridDataItem dataItem in grdCUGPublic0.MasterTableView.Items)// grd.MasterTableView.Items)
            {
                if (((CheckBox)dataItem.FindControl("Chk1")).Checked == true)
                {
                    // Int32 ID = (Int32)dataItem.GetDataKeyValue("ID");
                    Int32 ID = Convert.ToInt32(dataItem.GetDataKeyValue("Mobile Number"));
                    //return ID;
                }
            }