public IEnumerable<CustOrderHist> CustOrderHist(string customerid)
{
ObjectParameter customeridParameter = null;
if (customerid != null) { customeridParameter = new ObjectParameter("CustomerID", customerid); }
else { customeridParameter = new ObjectParameter("CustomerID", typeof(string)); }
var retval = base.ExecuteFunction<CustOrderHist>("CustOrderHist", customeridParameter).ToList();
return retval;
}