C# Online Compiler | .NET Fiddle

<no name> by Anonymous

using System;
using System.Linq;
using System.Collections.Generic;
					
public class Program
{
	public static void Main()
	{
		var test = "ABC123";

            for (var i = 0; i < 1000; i++)
            {
                Console.WriteLine(test = Increment2(test));
            }

	}
		
	static string Increment(string source)
	{
		var chars = "0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZ";
		
		var last = source[source.Length - 1];
		if (last == chars[chars.Length - 1])
		{
			last = '0';
			return Increment(source.Substring(0, source.Length - 1)) + last;
		}
		else
		{
			return source.Substring(0, source.Length - 1) + chars[chars.IndexOf(last) + 1];
		}
	}
	
	static string Increment2(string source) {
		var builder = new char[6];
		int i;
		for (i = source.Length; i > 0;)
		{ 
			--i; 
			char ch = (char) ((int) source[i] + 1); 
			if (ch == '9' + 1) 
				ch = 'A'; 
			else if (ch == 'Z' + 1) {
				ch = '0';
			} 
			builder[i] = ch;
			if (ch == '0') continue;
			break; 
		}
		while (i > 0) { --i; builder[i] = source[i]; }
		return new String(builder);
	}
}

​x
 
using System;
using System.Linq;
using System.Collections.Generic;
                    
public class Program
{
    public static void Main()
    {
        var test = "ABC123";
​
            for (var i = 0; i < 1000; i++)
            {
                Console.WriteLine(test = Increment2(test));
            }
​
    }
        
    static string Increment(string source)
    {
        var chars = "0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZ";
        
        var last = source[source.Length - 1];
        if (last == chars[chars.Length - 1])
        {
            last = '0';
            return Increment(source.Substring(0, source.Length - 1)) + last;
        }
        else
        {
            return source.Substring(0, source.Length - 1) + chars[chars.IndexOf(last) + 1];
        }
    }
    
    static string Increment2(string source) {
        var builder = new char[6];
        int i;
        for (i = source.Length; i > 0;)
        { 
            --i; 
            char ch = (char) ((int) source[i] + 1); 
            if (ch == '9' + 1) 
                ch = 'A'; 
            else if (ch == 'Z' + 1) {
                ch = '0';
            } 
            builder[i] = ch;
            if (ch == '0') continue;
            break; 
        }
        while (i > 0) { --i; builder[i] = source[i]; }
        return new String(builder);
    }
}
​
​
​

Unhandled exception. System.TypeInitializationException: The type initializer for 'System.Data.Entity.DbContext' threw an exception.
---> System.TypeInitializationException: The type initializer for 'Z.EntityFramework.Classic.EntityFrameworkManager' threw an exception.
---> System.TypeInitializationException: The type initializer for '' threw an exception.
---> System.IO.FileNotFoundException: Could not load file or assembly 'System.Configuration.ConfigurationManager, Version=8.0.0.0, Culture=neutral, PublicKeyToken=cc7b13ffcd2ddd51'. The system cannot find the file specified.

File name: 'System.Configuration.ConfigurationManager, Version=8.0.0.0, Culture=neutral, PublicKeyToken=cc7b13ffcd2ddd51'
   at Z.Expressions.CompilerManager..cctor()
   at Z.Expressions.CompilerManager.LoadEntityFrameworkClassicConfiguration()
   at Z.Expressions.ExceptionMessage.ThrowLicenseException()
   at ..cctor()
   --- End of inner exception stack trace ---
   at .()
   at Z.EntityFramework.Classic.EntityFrameworkManager..cctor()
   --- End of inner exception stack trace ---
   at Z.EntityFramework.Classic.EntityFrameworkManager.Initialize()
   at System.Data.Entity.DbContext..cctor()
   --- End of inner exception stack trace ---
   at System.Data.Entity.DbContext..ctor(String nameOrConnectionString)
   at Program.EntityContext..ctor()
   at Program.Main()
Command terminated by signal 6

Last Run:	11:34:49 pm
Compile:	0.048s
Execute:	0.16s
Memory:	11.66Mb
CPU:	0.208s

View IL Code