C sharp generieren jede 10 Sec wiederholen

private void button1_Click(object sender, EventArgs e)
        {

            do
            {
            
                //System.Threading.Thread.Sleep(500);
                // int passwordLength = 8;
                bool strongPassword = true;

                Random rnd = new Random();
                int seed = rnd.Next(1, int.MaxValue);

                //const string allowedChars = "ABCDEFGHJKLMNOPQRSTUVWXYZ0123456789"; 
                const string allowedChars = "abcdefghijkmnopqrstuvwxyzABCDEFGHJKLMNOPQRSTUVWXYZ0123456789";  
                const string specialCharacters = @"!#$%&'()*+,-./:;<=>?@[\]_";  

                var chars = new char[passwordLength];
                var rd = new Random(seed);

                for (var i = 0; i < passwordLength; i++)
                {
                    // If we are to use special characters
                    if (strongPassword && i % rnd.Next(3, passwordLength) == 0)
                    {
                        chars[i] = specialCharacters[rd.Next(0, specialCharacters.Length)];
                    }
                    else
                    {
                        chars[i] = allowedChars[rd.Next(0, allowedChars.Length)];
                    }
                }

                //sKey = chars.ToString();
                sKey = string.Join("", chars);  

                textBoxKey.Text = sKey;

               
            } while (s == t);
            
        }