Hi, I am worried about thread-safety in the following code.
If two threads call GetObject() is it possible they both create a new
AlphaContext object and add it to HttpContext.Items?

Can I avoid this with a lock? (I assum I would need a "static" object to
lock on?)

public class ContextFactory
{
 private const string OBJECT_KEY = "AlphaSContext";
       
 private ContextFactory()
 {
 }

 public static IContext GetObject()
 {
   HttpContext httpContext = HttpContext.Current;
   IContext context = null;

   if (httpContext.Items.Contains(OBJECT_KEY))
   {
     context = (IContext)httpContext.Items[OBJECT_KEY];
   }
   else
   {
     context = new AlphaContext();
     httpContext.Items.Add(OBJECT_KEY, context);
   }
           
   return (IContext)context;
 }
}

Thanks, Peter