Please Answer as a vector NOT an array in C# language, I have the input and output file path I just need the code

Design a program that reads an ASCII text file (provided) one byte at a time and produces an output file that contains the frequency count of how many times each character appears in the input file. Do not sort the output. A character frequency class instance must be used to represent each unique character in the file (see below). For this exercise, the character frequency objects must be processed and stored using a Vector (or equivalent). Reading the entire file into memory is prohibited. C++ and Java programs are expected to use the Vector data structure and C# and VB programs are expected to use the ArrayList data structure. Vector Documentation C++ http://msdn.microsoft.com/en-us/library/9xd04bzs.aspx Java http://docs.oracle.com/javase/7/docs/api/java/util/Vector.html C#/VB(.NET) http://msdn.microsoft.com/en-us/library/vstudio/system.collections.arraylist