5+ C Sharp Password Validator Programs

This post contains a total of 5+ C Sharp Password Validator Program Examples with Source Code. All these programs to Validate Passwords are made using C Sharp.

You can use the source code of these examples with credits to the original owner.

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C Sharp Password Validator Programs

1. By Anon Fox

Made by Anon Fox. Password Validator With LinQ and Extension Methods. Source

Hello%$World12 : is Strong 
Am : is Weak
$Still : is Weak

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

namespace Tests
{
    class Program
    {

        static void Main(string[] args)
        {
            
            string input = @"Hello%$World12";
            string input1 = @"Am";
            string input2 = @"$Still";
            
            
            Validate(input);
            Validate(input1);
            Validate(input2);
        }


        public static void Validate(string password)
        {
            string input = Regex.Replace(password, @"\s", "");
            if (
        input.HasConvenientLength() &&
        input.CapturedMatches(@"\W")>= 2 && 
        input.CapturedMatches(@"\d")>=2
                )
            {
                Console.WriteLine("{0} : is Strong ",password);
                return;
            }

            Console.WriteLine("{0} : is Weak",password);
            
        }
    }
    
    public static class StringExtension
    {
        public static bool HasConvenientLength(this string input)
        {
            return input.Length >= 7 ;
        }
        
        public static int CapturedMatches(this string input, string pattern)
        {
            var list = input.Where(c => Regex.IsMatch(c + "", pattern));
            return list.Count();
        }
        

    }
    
    
}

2. By Piotr

Made by Piotr. Simple C Sharp Password validator Program. Source

Password is incorrect
Password is incorrect
Password is correct

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;


namespace PasswordValidator
{
    class Program
    {
        static void Main(string[] args)
        {
            List <string> passwords = new List<string>(){"Password","Password123","$psword1"};
            string numbers = "1234567890";
            string special = "";
            var j = Enumerable.Range(33,70);
            foreach(var x in (from int k in j where (k<=48||(k>57&&k<65)) select k).ToList())
            {
                special+=Convert.ToChar((int)x);
            }
            foreach(string pass in passwords){ 
                Console.WriteLine((pass.Length>=5&&pass.Length<=10&&(pass.Count(i=>numbers.IndexOf(i)!=-1||special.IndexOf(i)!=-1)>=2)&&(!pass.Contains(' ')))?"Password is correct":"Password is incorrect");
            }
        }
    }
}

3. By Jingga Sona

Made by Jingga Sona. Source

qwerty is not a valid password

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


namespace Sololearn
{
    class Program
    {
        static void Main(string[] args)
        {
            
            
            Regex rgx = new Regex(@"\w\W");
            string b = Console.ReadLine();
            if (b.Length >= 5 && b.Length <=10){
               Console.WriteLine("{0} {1} a valid password",b,rgx.IsMatch(b) ? "is" : "is not");
               }
            else{
                Console.Write("Character Length Must Be Between 5 and 10");
            }
            
        }
    }
}

4. By Cyrus Ornob Corraya

Made by Cyrus Ornob Corraya. Basic Password validator program. Source

Qwerty123##
Valid

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;


namespace SoloLearn
{
    class Program
    {
        static void Main(string[] args)
        {
            string input = Console.ReadLine();
            
            if(validate (input))
            {
                Console.WriteLine("Valid");
            }
            else
            {
                Console.WriteLine("Invalid") ;
            }
        }
        
        static bool validate(string pw)
        {
            if(pw.Length < 8 || pw.Length > 12) return false;
            
            if(pw.Contains("/")) return false;
            if(pw.Contains("\\")) return false;
            if(pw.Contains(" ")) return false;
            
            string digits = "0123456789";
            
            if(digits.Contains(pw[0])) return false;
            
            bool con_digit = false;
            
            foreach (char d in digits){
                if(pw.Contains(d)){ con_digit=true; break;} 
            }
            
            string uppercase = "ABCDEFGHIJKLMNOPQRSTUVWXYZ";
            
            bool con_uppercase = false;
            
            foreach (char u in uppercase){
                if(pw.Contains(u)){ con_uppercase=true; break;} 
            }
            
            return con_uppercase && con_digit;
        }
    }
}

5. By Donkey I

Made by Donkey I. Program to checks if the user input is a valid password or not. Source

Pass123
False

using System;
using System.Linq;


namespace SoloLearn
{
    class Program
    {
        static void Main(string[] args)
        {
            string pass = Console.ReadLine();
            Console.Write(pass.Any(c => Char.IsDigit(c)) &&
                pass.Any(c => "&[email protected]$#%".Contains(c)) &&
                pass.Length >= 5 &&
                pass.Length <= 10 &&
                !pass.Contains(' '));
        }
    }
}

6. By MR Programmer

Made by MR Programmer. Source

123pass
Invalid Password

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace SoloLearn
{
    class Program
    {
        static void Main(string[] args)
        {		
        	bool cNum=false,cCalpha=false,cAlpha=false,cChar=false,cSnum=false;
			var inputPass = Console.ReadLine();
			if(inputPass.Length >= 8){
				cNum = inputPass.All(char.IsDigit);
				cCalpha = inputPass.All(char.IsUpper);
				cAlpha = inputPass.All(char.IsLetter);
				cChar = inputPass.Contains("\\") || inputPass.Contains(" ") || inputPass.Contains("/");
				cSnum = char.IsDigit(inputPass[0]);
				if(!cSnum && cCalpha && cAlpha && !cChar && cNum)
					Console.WriteLine("Valid Password");
				else Console.WriteLine("Invalid Password");
				
			}else Console.WriteLine("Invalid Password Less Than * digit");
            
        }
    }
}