System.Security.Policy (mscorlib.dll)sealed class
public sealed class Url : IIdentityPermissionFactory, IBuiltInEvidence {
// Public Constructors
   public Url(string name);
// Public Instance Properties
   public string Value{get; }
// Public Instance Methods
   public object Copy(  );
   public IPermission CreateIdentityPermission(Evidence evidence);
 // implements IIdentityPermissionFactory
   public override bool Equals(object o);        
// overrides object
   public override int GetHashCode(  );    
// overrides object
   public override string ToString(  );    
// overrides object

The Url evidence class identifies the URL from where an assembly was loadedfor example, https://www.oreilly.com:8080/SomeFile.exe. The source URL is passed as a System.String argument to the Url constructor and is accessible later through the Value property.

During policy resolution, the UrlMembershipCondition class uses Url evidence to determine if code qualifies for membership of a code group. The ApplicationDirectoryMembershipCondition class also uses Url evidence in conjunction with ApplicationDirectory evidence to determine code group membership.

Because the Url class implements the IIdentityPermissionFactory interface, an assembly or application domain with Url evidence will contain an appropriately configured System.Security.Permissions.UrlIdentityPermission object in its grant set.

    Part V: API Quick Reference