ASP.NET Source Code Viewer Font Size: 
<%@ Page Language="C#" Trace="True"  %>
<script runat="server">

// Lowercase 'base' is a keyword
public int Factorial(int Base){
    if (Base <=0){
        Trace.Warn("Factorial", "Invalid Base value: " + Base);
        return 0;
    }
    else if(Base == 1){
        Trace.Write ("Factorial", "Exit condition met, returning.");
        return Base;
    }
    else {
        Trace.Write("Factorial","Recursing, new value: " + (Base-1));
        return (Base * Factorial(Base-1));
    }
}
</script>
<html>
<head>
</head>
<body>
<%
    Response.Write(Factorial(-1) + "<br>");
    Response.Write(Factorial(5) + "<br>");
%>
</body>
</html>