How do i make multiple keys for my key login?

Hello! I just made my executor and wanted to add a key login. Everything works, but i only can use one key. Can someone help me please or write me a new script? Thanks


Script:

private void button3_Click(object sender, EventArgs e)

        {

            // the login code:

            if (textBox1.Text == new WebClient().DownloadString("Here is my pastebin") || textBox1.Text == "4892439802938491840983412")

            {

                MessageBox.Show("Thank you for using SeaSploit!");

                this.Hide();

                SeaSploit main = new SeaSploit();

                main.Show();

 

            }

            else

            {

                MessageBox.Show("Sorry the key is invalid. Try again.", "Key Invalid");

                // end

            }

        }