OneAwayString, C# - rextester

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//Rextester.Program.Main is the entry point for your code. Don't change it.
//Compiler version 4.0.30319.17929 for Microsoft (R) .NET Framework 4.5

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text.RegularExpressions;

namespace Rextester
{
    public class Program
    {
        public static void Main(string[] args)
        {
            /*isOneAway("abcde", "abcd");  // should return true
            isOneAway("abde", "abcde");  // should return true
            isOneAway("a", "a");  // should return true
            isOneAway("abcdef", "abqdef");  // should return true
            isOneAway("abcdef", "abccef");  // should return true
            isOneAway("abcdef", "abcde");  // should return true
            isOneAway("aaa", "abc");  // should return false
            isOneAway("abcde", "abc");  // should return false
            isOneAway("abc", "abcde");  // should return false
            isOneAway("abc", "bcc");  // should return false*/
            Console.WriteLine(isOneAway("abqde", "abcdf"));
        }
        
        public static bool isOneAway(string a, string b){
           if( a.Length - b.Length >=2 || b.Length - a.Length >=2 ) return false;
           else if( a.Length == b.Length ) return isSameLength(a, b);
           else if ( a.Length > b.Length ) return isDifferentLength( a, b);
           else return isDifferentLength ( b, a);
        }
        
        public static bool isSameLength( string a, string b) {
            int count = 0;
            for (int i=0; i< a.Length; i++) {
                if( a[i] != b[i] ) {
                    count += 1;
                    if (count > 1) return false;
                }
            }
            
          return true;
        }
        
        public static bool isDifferentLength( string a, string b) {
            int i = 0, count = 0;
            while ( i < b.Length ) {
                if( a[i+count] == b[i] ) i +=1 ;
                else
                    count += 1;
                    if (count > 1) return false;
            
            }
            return true;
            
        }
    }
}

Show compiler warnings [ + ] Show input
Compilation time: 0,16 sec, absolute running time: 0,08 sec, cpu time: 0,09 sec, average memory usage: 13 Mb, average nr of threads: 3