private void sign_up_Click(object sender, EventArgs e) { string login = username_box.Text.ToUpper(); if ((password_box.Text == "") || (confirm_box.Text == "") || (username_box.Text == "")) { error_sign_up.Text = "Each fields are required"; error_sign_up.Visible = true; } else if ((dB.Query("Select ID from accounts_list where login = '******'") != "")) { error_sign_up.Text = "Username is not unique!"; error_sign_up.Visible = true; } else if ((password_box.Text != confirm_box.Text) || (password_box.Text == "")) { error_sign_up.Text = "Passwords do not match!"; error_sign_up.Visible = true; } else { dB.CreateNewUser(login, password_box.Text); error_sign_up.Visible = false; error_login.Text = "Your account is created"; error_login.Visible = true; username_box.Text = ""; panel2.Visible = false; panel1.Visible = true; back_button.Visible = false; } password_box.Text = ""; confirm_box.Text = ""; }