protected void EmployeesGrid_RowDeleting(object sender, DevExpress.Web.Data.ASPxDataDeletingEventArgs e)
{
int rowindex = EmployeesGrid.FindVisibleIndexByKeyValue(e.Keys[EmployeesGrid.KeyFieldName]);
ASPxGridView grid = (ASPxGridView)sender;
var id = grid.GetRowValues(rowindex, "ID").ToString();
db.D_Grup(Convert.ToInt32(id));
e.Cancel = true;
EmployeesGrid.CancelEdit();
Update();
}