Async in c#, web service Credential

<%@ Page Language="C#" AutoEventWireup="true" CodeFile="SimActivation.aspx.cs"  Async="true" Inherits="SimActivation" %>




com.att.wireless.eod.Provision p = new com.att.wireless.eod.Provision();
p.Credentials = new System.Net.NetworkCredential("xx",
"xx", "costudio.com");

p.Activate_SIM_PPUCompleted +=new com.att.wireless.eod.Activate_SIM_PPUCompletedEventHandler(UpdatePhoneNumber);
p.Activate_SIM_PPUAsync(koreId, "VRG1", activateDate,
"lbt", string.Empty, string.Empty,
string.Empty, string.Empty, string.Empty, string.Empty, 99, string.Empty);




public void UpdatePhoneNumber(object o, com.att.wireless.eod.Activate_SIM_PPUCompletedEventArgs e)
{
if (e.Result.Status_Code.Equals("1"))
dm.ActivateWithPhone(koreId, e.Result.MSISDN);
Response.Write("Status Code: " + e.Result.Status_Code + ", MSISDN:" + e.Result.MSISDN + ", Batch_Identifier:" + e.Result.Batch_Identifier);
Response.End();
}