Get used chars

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//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 Ext_GetUsedChars(this string iString)
{
IList vList = new List();
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; } } } [/csharp]

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