WebRequest.Create抛出System.NullReferenceException

Question

I am trying to create the instance of WebRequest but it throws the exception.

Code:

WebRequest request = WebRequest.Create("somURL");

Error:

System.NullReferenceException: Object reference not set to an instance of an object.

This code is working on local environment but failed on client production server.

Note: client has recently change the hosting. .Net Framework is 3.5.

Full Exception:

System.Security.SecurityException: Request for the permission of type 'System.Net.WebPermission, System, Version=2.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089' failed. at System.Security.CodeAccessSecurityEngine.Check(Object demand, StackCrawlMark& stackMark, Boolean isPermSet) at System.Security.CodeAccessPermission.Demand() at System.Net.HttpWebRequest..ctor(Uri uri, ServicePoint servicePoint) at System.Net.HttpRequestCreator.Create(Uri Uri) at System.Net.WebRequest.Create(Uri requestUri, Boolean useUriBase) at System.Net.WebRequest.Create(String requestUriString) at 

Answer 1

Looking at the exception, it look like the Code Access Security has raise this. I see a similar thread, please take a look.

Security Exception of WebRequest

About Code Access Security