Radgrid Excel Export In Loop

See more:

C#

ASP.NET

Telerik

I tried to export the data to excel using radgrid option, it's working fine on single export. but I tried to export in for each loop, last file data's only exported. Is possible to export in loop?

protected void btnexport_Click(object sender, EventArgs e)
{
    string selectedimportfilesid = "";
    IList<radlistboxitem> collection = ListBoxFileNames.CheckedItems;
    string selectedfilename = "";
    DataTable dtselect = new DataTable();
    foreach (RadListBoxItem item in collection)
    {
        Label filename = (Label)item.FindControl("lblfilename");
        Label Importfileid = (Label)item.FindControl("lblimportfileid");
        selectedfilename = filename.Text;
        selectedimportfilesid = Importfileid.Text;
        dtselect = selectedexportfilelist(selectedimportfilesid);
        testgrid.DataSource = dtselect; 
        testgrid.DataBind();
        testgrid.ExportSettings.IgnorePaging = true;
        testgrid.ExportSettings.FileName = selectedfilename 
        testgrid.ExportSettings.OpenInNewWindow = true;
        testgrid.ExportSettings.Excel.FileExtension = "xls";
        testgrid.MasterTableView.ExportToExcel();
    }
}