how to create an ajax enabled auto filled textbox using ibmdb2 database

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C#

ASP.NET

DB2

i am trying to run a autofill textbox using db2 database
it is running fine with sql server but how can i do it with ibmdb2
the code is :
aspx:

<asp:TextBox ID="txtSourceSystem" runat="server"  style="background-color: #3e89d7; color: #FFFFFF;"></asp:TextBox>

                            <cc1:AutoCompleteExtender ServiceMethod="SearchCountry" MinimumPrefixLength="1" CompletionInterval="100"
                                EnableCaching="false" CompletionSetCount="1" TargetControlID="txtSourceSystem"
                                ID="AutoCompleteExtender1" runat="server" FirstRowSelected = "false">
                           </cc1:AutoCompleteExtender>

cs page is:

public static List<string> SearchCountry(string prefixText, int count)
        {
            // DB2Connection conn = new DB2Connection("Server=DEV4131;Database=FTEDB;UID=db2admin;PWD=db2admin;");
            using (DB2Connection conn = new DB2Connection())
            {

                conn.ConnectionString = ConfigurationManager.ConnectionStrings["DB2ConnectionString"].ConnectionString;

                using (DB2Command cmd = new DB2Command())
                {

                    cmd.CommandText = "select JOB_NAME from FTELOG.TRANSFER where " + "JOB_NAME like @SearchText + '%'";
                    cmd.Parameters.Add("@SearchText", prefixText);

                    cmd.Connection = conn;
                    conn.Open();
                    List<string> country = new List<string>();
                    using (DB2DataReader db2dr = cmd.ExecuteReader())
                    {
                        while (db2dr.Read())
                        {
                            country.Add(db2dr["JOB_NAME"].ToString());
                        }
                    }
                    conn.Close();
                    return country;
                }
            }
        }

and it is showing error is db2Exception unhandled by usercode