Retrieve Selected Field using NAV WebServices

Hello Friends,

I am developing a web application in asp.net with c# .I am making a form of sales order.I place a dropdown

to fill the list of sell to customer no. field. But i am unable to fetch a single field through WebServices. So Tell me how to solve

This. i am using the following code:

List<SalesOrderWS_Filter> S_filter = new List<SalesOrderWS_Filter>();

SalesOrderWS_Filter nameFilter = new SalesOrderWS_Filter();

nameFilter.Field = SalesOrderWS_Fields.Sell_to_Customer_Name;

nameFilter.Criteria = Session["user"].ToString();

S_filter.Add(nameFilter);

SalesOrderWS[] list = SalesService.ReadMultiple(S_filter.ToArray(), null, 100);

foreach (SalesOrderWS c in list)

{



grd_OrderDetails.DataSource = list;

grd_OrderDetails.DataBind();

}

and by use of this code my grid display every field of table but i want tha the selected fields are visible in grid .

Please Help me on both problem..