protected void Button1_Click1(object sender, EventArgs e) { UserRegisterBusiness userReg = new UserRegisterBusiness(); string validateResult = userReg.RegisterValidation(txtUsername.Value.Trim(), txtNickname.Value, txtPassword.Value, txtConfirmPassword.Value, txtMail.Value.Trim()); if (string.IsNullOrEmpty(validateResult)) { int i = userReg.CheckUserExist(txtUsername.Value.Trim()); if (i > 0) { RegisterErrorMessageshtml += "Username already exists,please register again"; } else { userReg.CreateUser(txtUsername.Value.Trim(), txtNickname.Value, txtPassword.Value, txtMail.Value.Trim()); Response.Redirect("Login.aspx"); } } else { RegisterErrorMessageshtml += validateResult; } }