diff --git a/Expression.cs b/Expression.cs
index b35a72d..6e3f22f 100644
--- a/Expression.cs
+++ b/Expression.cs
@@ -31,7 +31,24 @@ namespace ln.templates
             return TopEval.Evaluate(context);
         }
 
-
+        public bool IsTrue(Context context)
+        {
+            try
+            {
+                object v = Evaluate(context);
+                if ((v is bool) && ((bool)v))
+                    return true;
+                if ((v is string) && (!String.Empty.Equals(v)))
+                    return true;
+                if ((v is int) && ((int)v != 0))
+                    return true;
+                return false;
+            }
+            catch (Exception e)
+            {
+                return false;
+            }
+        }
 
 
         private void Compile()