foo.cs

// avoid duplicate primitives, use an object instead
// Func<string, string, bool, bool, bool> becomes Func<Foo, bool>

public class Foo
{
   public string ErrorMessage {get;set;}
   public string SuccessMessage {get;set;}
}

public static bool dynamicMethodGeneration(Func<Foo, bool> success, Func<Foo, bool> onError)
{
   //dostuff
   if(doStuff()){
      success(new Foo())
   } 
   else
   {
      onError(new Foo())

   }
}

gistfile1.cs

dynamicMethodGeneration(
                                //normal processing lambda
                                (stringParam1, stringParam2, boolParam1, boolParam1) =>
                                {
                                    Console.WriteLine(stringParam1);
                                    Console.WriteLine(stringParam2);
                                     return true;
                                },
                                //error processing lambda
                                (stringParam1, stringParam2, boolParam1, boolParam1) => 
                                {
                                    Console.WriteLine(stringParam1);
                                    Console.WriteLine(stringParam2);
                                    return false;
                                },
                                true , false);


public static bool dynamicMethodGeneration(Func<String, String, bool, bool, returnBool> normalProcessing,
            Func<String, String, bool, bool, returnBool> errorProcessing, bool error, bool normal)
        {
            IWebElement returnElement = null;

            if (error)//PROCESSING ON ERROR
                {        
                    return errorProcessing(new String("Hello World Normal 1."), new String("Hello World Normal 2."), true, false);
                }//NORMAL PROCESSING
                else if (normal)
                {
                    return normalProcessing(new String("Hello World Error 1."), new String("Hello World Error 2."), true, false);
                }
        }

gistfile1.txt

dynamicMethodGeneration(
                                //normal processing lambda
                                (stringParam1, stringParam2, boolParam1, boolParam1) =>
                                {
                                    Console.WriteLine(stringParam1);
                                    Console.WriteLine(stringParam2);
                                     return true;
                                },
                                //error processing lambda
                                (stringParam1, stringParam2, boolParam1, boolParam1) => 
                                {
                                    Console.WriteLine(stringParam1);
                                    Console.WriteLine(stringParam2);
                                    return false;
                                },
                                true , false);


public static bool dynamicMethodGeneration(Func<String, String, bool, bool, returnBool> normalProcessing,
            Func<String, String, bool, bool, returnBool> errorProcessing, bool error, bool normal)
        {
            IWebElement returnElement = null;

            if (error)//PROCESSING ON ERROR
                {        
                    return errorProcessing(new String("Hello World Normal 1."), new String("Hello World Normal 2."), true, false);
                }//NORMAL PROCESSING
                else if (normal)
                {
                    return normalProcessing(new String("Hello World Error 1."), new String("Hello World Error 2."), true, false);
                }
        }