how to create an autocomplete textbox which procedure possessed three parameters, namely the textbox / parameter field, select query, and connection?

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C#

ASP.NET

how to create an autocomplete textbox which procedure possessed three parameters, namely the textbox / parameter field, select query, and connection?
so far I am using ajax auto complete, but the parameter field (prefixText) it can not be replaced..

public static List<string> GetNama(string prefixText)
   {
       SqlConnection conn = new SqlConnection(connStr);
       conn.Open();
       SqlCommand cmd = new SqlCommand("select * from report where nama like @nama+'%' or report_id like @report_id+'%'", conn);
       cmd.Parameters.AddWithValue("@nama", prefixText);
       cmd.Parameters.AddWithValue("@report_id", prefixText);

       List<string> ReportNama = new List<string>();
       using (SqlDataReader sdr = cmd.ExecuteReader())
       {
           while (sdr.Read())
           {
               ReportNama.Add(sdr[0].ToString());
               ReportNama.Add(sdr[1].ToString());
           }
       }
       return ReportNama;
   }

how to make auto complete text as I was getting on?
do not use ajax auto complete does not matter..
thanks if you can help me :)