Как в DataAdapter (Oracle) добавить параметры?

string strSQL = "SELECT FAM, IM, OT, STATUS, LIMIT, CREDIT, DATECREDIT, DATE_SEND FROM ANKETAR WHERE CLIENTEMAIL=:CLIENTEMAIL";
			
			if (sortExpression != null) strSQL += string.Format(" ORDER BY {0}", sortExpression);
			else strSQL += string.Format(" ORDER BY DATE_SEND ASC");

			OracleConnection con = new OracleConnection(conStr);
			OracleDataAdapter da = new OracleDataAdapter(strSQL, conStr);
			da.SelectCommand.Parameters.Add(":CLIENTEMAIL", OracleDbType.Char, 30);
			da.SelectCommand.Parameters[":CLIENTEMAIL"].Value = WhoIs(conStr);
			DataSet ds = new DataSet();
			da.Fill(ds, "ANKETAR");
			ClientsDataGrid.DataSource = ds;
			ClientsDataGrid.DataMember = "ANKETAR";
			ClientsDataGrid.DataBind();

da.SelectCommand.Parameters[":CLIENTEMAIL"].Value = WhoIs(conStr);

string tmpValue = WhoIs(conStr);
			da.SelectCommand.Parameters[":CLIENTEMAIL"].Value = tmpValue;