SelectCommand Dynamic Column Names?

Feb 8, 2011

I have a database with two columns: Retailers or Traders. A row can have only one of them with values while the other must be 'Null'. Both are nvarchars kinds. What I am trying to do is to show data if a radio button is selected for either Retailer or Trader. So I constructed a SelectCommand statement which is getting column names of either 'Retailers' or 'Traders' as a parameter but the SelectCommand statement still returns all records. What can I do?

<asp:SqlDataSource ID="dsSearchResults" runat="server" ConnectionString="<%$ ConnectionStrings:AdoFabricsConnection %>"
SelectCommand="SELECT Name,Address1,City,State,Zip, Telephone, Email_Address, TO_THE_Trade, Retailer,

[code]...

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