How do you create a key system?

For the "get key" you can use this code: Process.Start("Insert your link here");

Now for the key system:

if (TEXTBOXNAMEHERE.Text == "Key in here")

{

    MessageBox.Show("Thanks for using this exploit");

    this.Hide();

    Form2 main = new Form2();

    main.Show();

}

else

{

    MessageBox.Show("Invalid key, please try again.");

}

you will make a get key button which will open a link where the key is there to copy it

after that use this code

private void Login_Button_Click(object sender, EventArgs e)

        {

            string dir = Directory.GetCurrentDirectory();

            WebRequest wr = WebRequest.Create(new Uri("your pastebin raw url"));

            WebResponse ws = wr.GetResponse();

            StreamReader sr = new StreamReader(ws.GetResponseStream());

            string KeyFromServer = sr.ReadToEnd();

            string eneterdkey = (yourtextbox).Text;

            if (eneterdkey.Contains(KeyFromServer))

            {

                MessageBox.Show("Thanks for using my exploit!");

                this.Hide();

                Exploit exploit = new Exploit();

                exploit.Show();

            }

            else

            {

                MessageBox.Show("Invalid, Try again!");

            }

        }

of course you will need to make a pastebin and you can update the key daily

@53926

I was considering that, however what if someone finds the link to your pastebin and shares the key? 

@53926 ik but i am too lazy to code it again and make it more simple