Soap

public class SecureWebService : WebService
 {
  public CredentialSoapHeader Credentials;

protected string VerifyCredentials()
  {
   System.Threading.Thread.Sleep(2000);
   if (this.Credentials == null 
    || this.Credentials.Username == null 
    || this.Credentials.PasswordHash == null)
   {
    throw new SoapException("权限不支持", 
     SoapException.ClientFaultCode, "Security");
   }

   if( this.Credentials.VersionNo != Configuration.Instance.VersionNo )
    throw new SoapException("版本不匹配.", 
     SoapException.VersionMismatchFaultCode, "Security");

     return CheckCredential(this.Credentials);
  }