or

<telerik:RadAsyncUpload runat="server" ID="radAsyncUpload1" MultipleFileSelection="Disabled" HideFileInput="true" Localization-Select="Import" OnClientFilesUploaded="clientFilesUploaded" OnFileUploaded="radAsyncUpload1_FileUploaded" TemporaryFolder="~/Logs" />protected override void OnInit(EventArgs e) { base.OnInit(e); AddGrid(); } private void AddGrid() { _grid = new RadGrid { ID = "TestGrid", PageSize = 30, ShowGroupPanel = false, AllowSorting = false, AllowPaging = true, AutoGenerateColumns = false, GridLines = GridLines.Vertical, VirtualItemCount =0 }; _grid.ClientSettings.AllowDragToGroup = false; _grid.ClientSettings.AllowColumnsReorder = false; _grid.ClientSettings.AllowColumnHide = true; _grid.ClientSettings.Animation.AllowColumnReorderAnimation = false; _grid.ClientSettings.Animation.AllowColumnRevertAnimation = false; _grid.MasterTableView.DataKeyNames = new[] { "Id" }; _grid.MasterTableView.ShowHeadersWhenNoRecords = true; _grid.MasterTableView.UseAllDataFields = true; _grid.MasterTableView.Name = "Master"; _grid.ItemDataBound += GridItemDataBound; _grid.PageIndexChanged += new GridPageChangedEventHandler_grid_PageIndexChanged);_grid.NeedDataSource += new GridNeedDataSourceEventHandler(_grid_NeedDataSource); var countryTemplate= new GridTemplateColumn { UniqueName = "ADDCountry", HeaderText = "Country Field", Resizable = true, }; countryTemplate.HeaderStyle.Font.Bold = true; countryTemplate.ItemTemplate = new Templateclass(countryTemplate.UniqueName, ExcelColumns); _grid.MasterTableView.Columns.Add(sourceTemplate); var stateTemplate = new GridTemplateColumn { UniqueName = "ADDState", HeaderText = "state Column Field", }; stateTemplate .HeaderStyle.Font.Bold = true;stateTemplate .ItemTemplate = new Templateclass(stateTemplate .UniqueName, null); _grid.MasterTableView.Columns.Add(stateTemplate ); var CityTemplate = new GridTemplateColumn { UniqueName = "ADDCity", HeaderText = "Mapping Rule", }; CityTemplate .HeaderStyle.Font.Bold = true; CityTemplate .ItemTemplate = new Templateclass(CityTemplate .HeaderText, null); _grid.MasterTableView.Columns.Add(CityTemplate); Content.Controls.Add(_grid); }void _grid_NeedDataSource(object sender, GridNeedDataSourceEventArgs e) { ((RadGrid)sender).MasterTableView.VirtualItemCount = bindingObject.Count; ((RadGrid)sender).CurrentPageIndex = ((RadGrid)sender).MasterTableView.CurrentPageIndex; ((RadGrid)sender).DataSource = bindingObject; }void _grid_PageIndexChanged(object sender, GridPageChangedEventArgs e) { ((RadGrid)sender).MasterTableView.CurrentPageIndex = ((RadGrid)sender).CurrentPageIndex; } void GridItemCreated(object sender, GridItemEventArgs e) { if (e.Item is GridDataItem) { GridDataItem dataItem = (GridDataItem)e.Item; DropDownList ddlCountry= (DropDownList)dataItem.FindControl("ddlCountry"); if (ddlCountry!= null) { ddlCountry.AutoPostBack = true; ddlCountry.SelectedIndexChanged += new EventHandler(ddlCountry_SelectedIndexChanged); } } }public class Templateclass: ITemplate {public Templateclass(string colNames,List<string> CountryNames) { colName = colNames; countryNames= CountryNames; }public void InstantiateIn(Control container) {//create a drop down controls for template columns}<asp:CheckBox runat="server" ID="chk_box" AutoPostBack="True"/>