ALTER PROCEDURE [dbo].[SEL] 
	@fio varchar( 30 ),
	@tel varchar( 10 )
AS
BEGIN
 SELECT @fio = RTRIM(@fio) + '%';
 SELECT @tel = RTRIM(@tel) + '%';
 SELECT FIO, ORG, OTDEL, DOLGN, TEL, EMAIL 
  FROM TELEFON 
  WHERE FIO like @fio
  or TEL like @tel;
END

protected void btn_search_Click(object sender, EventArgs e)
    {
        SqlDataSource1.SelectCommand = "sel";
        SqlDataSource1.SelectParameters.Clear();
        ControlParameter param1 = new ControlParameter("fio", "txt_fio");
        SqlDataSource1.SelectParameters.Add(param1);
        ControlParameter param2 = new ControlParameter("tel", "txt_tel");
        SqlDataSource1.SelectParameters.Add(param2);
    }