Server Error in '/' Application.

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Line 74:     {
Line 75:         System.Net.WebClient wc = new System.Net.WebClient();
Line 76:         byte[] data = wc.DownloadData(url);
Line 77:         return data;
Line 78:     }

[DllNotFoundException: Unable to load DLL 'rasapi32.dll': 动态链接库(DLL)初始化例程失败。 (Exception from HRESULT: 0x8007045A)]
   System.Net.RasHelper.RasEnumConnections(RASCONN[] lprasconn, UInt32& lpcb, UInt32& lpcConnections) +0
   System.Net.RasHelper.GetCurrentConnectoid() +237
   System.Net.AutoDetector.Initialize() +161
   System.Net.AutoDetector.get_CurrentAutoDetector() +37
   System.Net.AutoWebProxyScriptEngine..ctor(WebProxy proxy, Boolean useRegistry) +86
   System.Net.WebProxy.UnsafeUpdateFromRegistry() +61
   System.Net.WebProxy..ctor(Boolean enableAutoproxy) +51
   System.Net.Configuration.DefaultProxySectionInternal..ctor(DefaultProxySection section) +1932
   System.Net.Configuration.DefaultProxySectionInternal.GetSection() +203

[ConfigurationErrorsException: Error creating the Web Proxy specified in the 'system.net/defaultProxy' configuration section.]
   System.Net.Configuration.DefaultProxySectionInternal.GetSection() +324
   System.Net.WebRequest.get_InternalDefaultWebProxy() +137
   System.Net.HttpWebRequest..ctor(Uri uri, ServicePoint servicePoint) +249
   System.Net.HttpRequestCreator.Create(Uri Uri) +51
   System.Net.WebRequest.Create(Uri requestUri, Boolean useUriBase) +582
   System.Net.WebRequest.Create(Uri requestUri) +98
   System.Net.WebClient.GetWebRequest(Uri address) +40
   System.Net.WebClient.DownloadDataInternal(Uri address, WebRequest& request) +164

[WebException: An exception occurred during a WebClient request.]
   System.Net.WebClient.DownloadDataInternal(Uri address, WebRequest& request) +428
   System.Net.WebClient.DownloadData(Uri address) +196
   System.Net.WebClient.DownloadData(String address) +108
   ASP.global_asax.get_data(String url) in d:\wwwroot\gtyl\wwwroot\global.asax:76
   ASP.global_asax.Session_Start(Object sender, EventArgs e) in d:\wwwroot\gtyl\wwwroot\global.asax:27
   System.Web.SessionState.SessionStateModule.RaiseOnStart(EventArgs e) +177
   System.Web.SessionState.SessionStateModule.OnStart(EventArgs e) +37
   System.Web.SessionState.SessionStateModule.CompleteAcquireState() +375
   System.Web.SessionState.SessionStateModule.BeginAcquireState(Object source, EventArgs e, AsyncCallback cb, Object extraData) +1444
   System.Web.AsyncEventExecutionStep.System.Web.HttpApplication.IExecutionStep.Execute() +238
   System.Web.HttpApplication.ExecuteStep(IExecutionStep step, Boolean& completedSynchronously) +194