or
if (!Page.IsPostBack){ //set up an initial group by base var baseExpression = new GridGroupByExpression(); var selectField = new GridGroupByField {FieldAlias = "Base", FieldName = "Dest_Name", HeaderValueSeparator = " "}; baseExpression.SelectFields.Add(selectField); var groupField = new GridGroupByField() {FieldName = "Dest_Name"}; baseExpression.GroupByFields.Add(groupField); Grid.MasterTableView.GroupByExpressions.Add(baseExpression);}