or
<telerik:RadGrid ID="rgCampaignSelect" runat="server" AllowPaging="True" PageSize="10" AllowSorting="true" AllowFilteringByColumn="true" EnableEmbeddedSkins="False" Skin="GatorLayout" FilterMenu-Skin="Metro" FilterMenu-EnableEmbeddedSkins="True">


protected void Page_Load(object sender, EventArgs e) { SPSite site = new SPSite("http://abcdev"); using (SPWeb web = site.OpenWeb()) { try { SPList clientlist = web.Lists.TryGetList("clientmatter"); if (clientlist != null) { SPListItemCollection clientitems = clientlist.Items; DataGrid dg = new DataGrid(); dg.DataSource = clientlist.Items.GetDataTable(); foreach (SPListItem clientitem in clientitems) { string clientddlvalue = clientitem["clientid"].ToString(); //myselect.Items.Add(clientddlvalue); } if ( !IsPostBack ) { GridBoundColumn boundColumn; //Important: first Add column to the collection boundColumn = new GridBoundColumn(); this.RadGrid1.MasterTableView.Columns.Add(boundColumn); //Then set properties boundColumn.DataField = "clientid"; boundColumn.HeaderText = "clientid"; } } } catch { } { web.Dispose(); } } }<%@ Register Tagprefix="telerik" Namespace="Telerik.Web.UI" Assembly="Telerik.Web.UI, Version=2012.3.1205.35, Culture=neutral, PublicKeyToken=121fae78165ba3d4" %><%@ Register Tagprefix="telerik" Namespace="Telerik.Web.Design" Assembly="Telerik.Web.Design, Version=2012.3.1205.35, Culture=neutral, PublicKeyToken=121fae78165ba3d4" %>