SQL 2005 Assembly: System.Security.SecurityException: Request for the permission of type 'System.Net.WebPermission'... failed

[Siberwulf]

I'm trying to fetch an XML document from a website through an assembly
i built and attached to SQL 2005.
Here is my code for the SPROC assembly:

[Microsoft.SqlServer.Server.SqlProcedure]
public static void fetch_FeedData(string m_URL)
{
SqlPipe p = SqlContext.Pipe;

XmlDocument xmlRSS = new XmlDocument();

xmlRSS.Load(m_URL);

p.Send(xmlRSS.OuterXml);
}

Here's the exception:

A .NET Framework error occurred during execution of user defined
routine or aggregate 'fetch_FeedData':
System.Security.SecurityException: Request for the permission of type
'System.Net.WebPermission, System, Version=2.0.0.0, Culture=neutral,
PublicKeyToken=b77a5c561934e089' failed.
System.Security.SecurityException:
at System.Security.CodeAccessSecurityEngine.Check(Obj ect 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(Uri requestUri)
at System.Xml.XmlDownloadManager.GetNonFileStream(Uri uri,
ICredentials credentials)
at System.Xml.XmlDownloadManager.GetStream(Uri uri, ICredentials
credentials)
at System.Xml.XmlUrlResolver.GetEntity(Uri absoluteUri, String role,
Type ofObjectToReturn)
at System.Xml.XmlTextReaderImpl.OpenUrlDelegate(Objec t xmlResolver)
at System.Threading.CompressedStack.runTryCode(Object userData)
at
System.Runtime.CompilerServices.RuntimeHelpers.Exe cuteCodeWithGuaranteedCleanup(TryCode
code, CleanupCode backoutCode, Object userData)
at System.Threading.CompressedStack.Run(CompressedSta ck
compressedStack, ContextCallback callback, Object state)
at System.Xml.XmlTextReaderImpl.OpenUrl()
at System.Xml.XmlTextReaderImpl.Read()
at System.Xml.XmlLoader.Load(XmlDocument doc, XmlReader reader,
Boolean preserveWhitespace)
at System.Xml.XmlDocument.Load(XmlReader reader)
at System.Xml.XmlDocument.Load(String filename)
at StoredProcedures.fetch_FeedData(String m_URL)
..

Thansk for the help in advance!