(adsbygoogle = window.adsbygoogle || []).push({}); So im making a program that requires serial keys.
I got it to read the serial keys but i want it so it reads to see if the key is banned.

the txt file has keys in every line but i want it to be like

    EXAMPLE:

key:NotBanned

1337:Banned

This is my code:

    

private void button3_Click(object sender, EventArgs e)

        {

            if (keyBOX.Text != "")

            {

                if (isValid(keyBOX.Text))

                {

                    MessageBox.Show("Valid key!", title, MessageBoxButtons.OK, MessageBoxIcon.Information);

                }

                else

                {

                    MessageBox.Show("Invalid key!", title, MessageBoxButtons.OK, MessageBoxIcon.Error);

                }

            }

            else

            {

                MessageBox.Show("Enter a key!", title, MessageBoxButtons.OK, MessageBoxIcon.Error);

            }



        }

        

        public bool isValid(string key)

        {

            if(String.IsNullOrEmpty(key)) 

            {

                return false;

            }

            using (WebClient wb = new WebClient())

            {

                foreach (string mKey in wb.DownloadString("the txt file").Split('\n')

                    if (mKey == key) return true;

                return false;

            }

        }

I hope someone can help me with the ban system

Sincerly, MrMods.

Have you tried using the NetSeal system?

Not really sure what you're trying to do here. You're using webclient to read a local file which isn't necessary at all. You should be using File.ReadAllLines, which returns the contents of a txt file in an array for you to sort through.

For example (excuse any syntax errors):

    

bool check(string key) {

    string[] contents = File.ReadAllLines("keys.txt");

    foreach(string the_key in contents) {

        if (key == the_key)

            return true;

    }

}

or are you trying to read a text file off your server? if so, let me know.

NetSeal can be bypassed easily so i have decided not to using it and use my method

its reading a txt from my server

Right, I figured that after I posted that reply. Your best bet is NOT to store your keys in plaintext as, well, anyone who can deobfuscate your program can get access to every key.

What I would do is create a database for your site with a users table to store their username, key and whatever else you want. Then instead of reading a text file, make a PHP script that accepts a GET parameter with a key. In that script just check your users table to see if the key exists and if so, return some success message. Security is non-existent here so you'll have to work on that yourself.

As for banning, if you use what I mentioned above, you can just make a column for is_banned or something, and if it's true then you can have another column for ban_message, although this is completely optional. Just make another check before spitting out the success message to check if they're banned. If so, then just output their ban message.

    public bool isValid(string Key)

            {

                if (String.IsNullOrEmpty(Key)) return false;

                using (WebClient wb = new WebClient())

                {

                    foreach (string mKey in wb.DownloadString("yoursite").Split('\n')

                    {

                        string[] mBits = mKey.Split('|';

                        if(mBits.Length == 2)

                        { 

                            MessageBox.Show("Your key is banned, reason: \n" + mBits[1]); 

                            return false; 

                        }

                        if (mKey == Key) return true;

                    }

                }

                return false;

            }

text file structure e.g.

    3948239845394

4258934485

23423092

example_key

9234309934|ur not cool.

ridksfjdjfgfd

In this example 9234309934 will be invalid key but will show a message saying he's banned. The reason being "ur not cool""

Thanks you bro <3

However Tustin has a point. Even if you obfuscate your program, they can easily run a packet sniffer and figure out the page you are requesting which stores all your keys. In your case they are all stored in plain text so you can easily find a valid key. I suggest you look into some form of encryption which can be used in both PHP and C# (for my past program I used rundael). Then I suggest you use a database to validate the keys or use an array and something like in_array to determine if the key is in the array. To add additional security, I suggest you add a time stamp to the encrypted response, and check this on you c# application as well (as anyone with a valid key can just copy the response and in a matter of create a page and rewrite your page to there own in host file).

I may make something and release in elite section later.

Theres a bug on it.
When the key is banned it says banned but then it says invalid.

    

private void flatButton3_Click(object sender, EventArgs e)

        {

            if (keyBOX.Text != "")

            {

                if (isValid(keyBOX.Text))

                {

                    MessageBox.Show("Valid key!", title, MessageBoxButtons.OK, MessageBoxIcon.Information);

                    this.Visible = false;

                    Form1 main = new Form1();

                    main.Visible = true;

                }

                else

                {

                    MessageBox.Show("Invalid key!", title, MessageBoxButtons.OK, MessageBoxIcon.Error);

                }

            }

            else

            {

                MessageBox.Show("Enter a key!", title, MessageBoxButtons.OK, MessageBoxIcon.Error);

            }

        }

        public bool isValid(string Key)

        {

            if (String.IsNullOrEmpty(Key)) return false;

            using (WebClient wb = new WebClient())

            {

                foreach (string mKey in wb.DownloadString("site").Split('\n')

                {

                    string[] mBits = mKey.Split('|';

                    if (mBits.Length == 2)

                    {

                        MessageBox.Show("Reason for ban:\n\n" + mBits[1]);

                        return false;

                    }

                    if (mKey == Key) return true;

                }

            }

            return false;

        }