Hi,
I have tried the following code to replicate your scenario and it worked as expected on my end.
C#:
protected void RadGrid1_ItemDataBound(object sender, Telerik.Web.UI.GridItemEventArgs e)
{
if (e.Item is GridDataItem)
{
GridDataItem dataItem = e.Item as GridDataItem;
GridGroupByExpression exp = new GridGroupByExpression();
GridGroupByField expfield = new GridGroupByField();
expfield = new GridGroupByField();
expfield.FieldName = "OrderID";
expfield.HeaderText = "Order count ";
expfield.FormatString = "<strong>{0:0.00}</strong>";
expfield.Aggregate = GridAggregateFunction.Count;
exp.SelectFields.Add(expfield);
expfield = new GridGroupByField();
expfield.FieldName = "Discount";
exp.GroupByFields.Add(expfield);
this.RadGrid1.MasterTableView.GroupByExpressions.Add(exp);
int fieldValue = int.Parse(dataItem["OrderID"].Text);
total += fieldValue;
}
if (e.Item is GridGroupFooterItem)
{
GridGroupFooterItem itm = e.Item as GridGroupFooterItem;
itm["OrderID"].Text = "Total :" + total.ToString();
total = 0;
}
}
Hope this will help.
Thanks,
Princy.