private void button1_Click_1(object sender, EventArgs e) { curd_functions curd1 = new curd_functions(); string sql = "SELECT username, password FROM user_account"; MySqlDataReader data = curd1.SelectQ(sql); string server_username = ""; string server_password = ""; while (data.Read()) { server_username = data.GetString("username"); server_password = data.GetString("password"); } string entered_username = username.Text; string entered_password = password.Text; if (entered_username == server_username && entered_password == server_password) { loading_screen LS = new loading_screen(); LS.Show(); this.Hide(); } else { MessageBox.Show("Password or username is invalid", "Authentication Error", MessageBoxButtons.OK, MessageBoxIcon.Error); username.Clear(); password.Clear(); username.Focus(); } }