or
protected void RadGrid1_ExcelExportCellFormatting(object source, ExcelExportCellFormattingEventArgs e)
{
GridDataItem item = e.Cell.Parent as GridDataItem;
e.Cell.Style["border"] = "solid 0.1pt #000000";
}
protected void RadGrid1_ItemCreated(object sender, GridItemEventArgs e)
{
if (e.Item is GridHeaderItem && bIsExport)
{
GridHeaderItem item = e.Item as GridHeaderItem;
item.Style["border"] = "solid 0.1pt #000000";
}
}