C# method missing

main.cs

public class Person : Gemini
{
    //define a method called MethodMissing taking in one parameter
    dynamic MethodMissing(dynamic callInfo)
    {
        //check to see if the method being called ends in Html
        if(callInfo.Name.EndsWith("Html"))
        {
            //if it does, add a method on the fly that returns
            //the html encoded version of the parsed property
            var member = callInfo.Name.Replace("Html", "");
            SetMember(callInfo.Name,
                new DynamicFunction(() =>
                {
                    return System.Web.HttpUtility.HtmlEncode(GetMember(member));
                });

            //return the value of the method
            return GetMember(callInfo.Name)();
        }

        //if the pattern isn't there, throw an exception defined in Gemini
        throw (Exception)MemberDoesntExistException(callInfo.Name);
    }
}

dynamic person = new Person();

person.FirstName = "Jane<>"; //set the FirstName Property
person.FirstName; //this would return Jane<>

/*
attempt to call FirstNameHtml()
calling this the first time will execute the 
method missing block with the following callInfo
this (Gemini)
  Name (String): FirstNameHtml
    Parameters (IEnumerable<dynamic>)
    ParameterNames (IEnumerable<dynamic>)
  Instance (Person)
    MethodMissing (DynamicFunctionWithParam)
    SetMembers (DynamicFunctionWithParam)
    FirstName (String): Jane<>
  Parameter (Gemini)
    SetMembers (DynamicFunctionWithParam)
  SetMembers (DynamicFunctionWithParam)
*/
//this would print Jane&lt;&gt;
Console.WriteLine(person.FirstNameHtml());

//method missing will not get called again because now the method exists :-)
//this would print Jane&lt;&gt;
Console.WriteLine(person.FirstNameHtml());