WebRequest.Create throws "Value cannot be null. Parameter name: str" exception
I wrote a wrapper around HttpWebRequest with the constructor :

>         public MyHttpRequest(string requestUrl)
>         {
>             this.webRequest = (HttpWebRequest)WebRequest.Create(requestUrl);
>         }

when I pass a vaild url that works in IE :
>http://www.google.co.il/search?q=%D7%A9%D7%9E%D7%A8+%D7%97%D7%A1%D7%95%D7%9F&ie=utf-8&oe=utf-8&aq=t&rls=org.mozilla:en-US:official&client=firefox-a

I get 

>System.ArgumentNullException occurred
  Message="Value cannot be null.\r\nParameter name: str"
  Source="mscorlib"
  ParamName="str"
  StackTrace:
       at System.Security.Permissions.FileIOPermission.HasIllegalCharacters(String[] str)
       at System.Security.Permissions.FileIOPermission.AddPathList(FileIOPermissionAccess access, AccessControlActions control, String[] pathListOrig, Boolean checkForDuplicates, Boolean needFullPath, Boolean copyPathList)
       at System.Security.Permissions.FileIOPermission..ctor(FileIOPermissionAccess access, String path)
       at System.Uri.ParseConfigFile(String file, IdnScopeFromConfig& idnStateConfig, IriParsingFromConfig& iriParsingConfig)
       at System.Uri.GetConfig(UriIdnScope& idnScope, Boolean& iriParsing)
       at System.Uri.InitializeUriConfig()
       at System.Uri.InitializeUri(ParsingError err, UriKind uriKind, UriFormatException& e)
       at System.Uri.CreateThis(String uri, Boolean dontEscape, UriKind uriKind)
       at System.Uri..ctor(String uriString)
       at System.Net.WebRequest.Create(String requestUriString)
 

Why is that ? how do i fix it ?


WebRequest.Create throws "Value cannot be null. Parameter name: str" exception
===

I wrote a wrapper around HttpWebRequest with the constructor :

>         public MyHttpRequest(string requestUrl)
>         {
>             this.webRequest = (HttpWebRequest)WebRequest.Create(requestUrl);
>         }

when I pass a vaild url that works in IE :
>http://www.google.co.il/search?q=%D7%A9%D7%9E%D7%A8+%D7%97%D7%A1%D7%95%D7%9F&ie=utf-8&oe=utf-8&aq=t&rls=org.mozilla:en-US:official&client=firefox-a

I get 

>System.ArgumentNullException occurred
  Message="Value cannot be null.\r\nParameter name: str"
  Source="mscorlib"
  ParamName="str"
  StackTrace:
       at System.Security.Permissions.FileIOPermission.HasIllegalCharacters(String[] str)
       at System.Security.Permissions.FileIOPermission.AddPathList(FileIOPermissionAccess access, AccessControlActions control, String[] pathListOrig, Boolean checkForDuplicates, Boolean needFullPath, Boolean copyPathList)
       at System.Security.Permissions.FileIOPermission..ctor(FileIOPermissionAccess access, String path)
       at System.Uri.ParseConfigFile(String file, IdnScopeFromConfig& idnStateConfig, IriParsingFromConfig& iriParsingConfig)
       at System.Uri.GetConfig(UriIdnScope& idnScope, Boolean& iriParsing)
       at System.Uri.InitializeUriConfig()
       at System.Uri.InitializeUri(ParsingError err, UriKind uriKind, UriFormatException& e)
       at System.Uri.CreateThis(String uri, Boolean dontEscape, UriKind uriKind)
       at System.Uri..ctor(String uriString)
       at System.Net.WebRequest.Create(String requestUriString)
 

Why is that ? how do i fix it ?

