The IRequiresSessionState is a marker interface which is empty without any methods or elements in it and gives read/write access to Sessions. A Marker interface like this one just informs the runtime that a certain feature is to be enabled.
On the other hand, if you require only a read only access to Session, use the IReadOnlySessionState which is also a marker interface.
C#
public class MyHandler : IHttpHandler, IRequiresSessionState
{
// Use Session now
}
VB.NET
Public Class MyHandler
Implements IHttpHandler, IRequiresSessionState
' Use Session now
End Class
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