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Get used chars

//The MIT License (MIT) //http://arolibraries.codeplex.com/license using System; using System.Collections.Generic; using System.Linq; using System.Text; using System.Text.RegularExpressions; namespace AroLibraries.ExtensionMethods.Strings {     public static class StringExt     {         public static IList<char> Ext_GetUsedChars(this string iString)         {             IList<char> vList = new List<char>();             for (int i = 0; i < iString.Length; i++)             {                 char vChar = iString[i];                 char cCharLower = Char.ToLower(vChar);                 if (!vList.Contains(cCharLower) && Char.IsLetter(cCharLower))                 {                     vList.Add(cCharLower);                 }             }             return vList;         }     } }