void buttonPassword_Click(object sender, EventArgs e)
        {
            this.widgetEmailFeedback.Reset();
            this.widgetPasswordFeedback.Reset();

            FormChecker checker = new FormChecker();
            string password = checker.GetStringValue(new ControlReference(this.textPassword, "Password"), true);
            string confirm = checker.GetStringValue(new ControlReference(this.textConfirm, "Confirm"), true);

            // check...
            if (!(checker.HasErrors))
            {
                // match?
                if (password == confirm)
                {
                    // set...
                    this.CurrentUser.SetPassword(password, true);

                    // show...
                    this.widgetPasswordFeedback.SetInfo("Your password has been changed.");
                }
                else
                    checker.AddError("The passwords do not match.");
            }

            // show...
            if (checker.HasErrors)
                this.widgetPasswordFeedback.SetError(checker);
        }
        void buttonReset_Click(object sender, EventArgs e)
        {
            this.widgetFeedback.Reset();

            // get...
            FormChecker checker = new FormChecker();
            string email = checker.GetStringValue(new ControlReference(this.textEmail, "Email"), true);

            // not...
            if(!(checker.HasErrors))
            {
                // find...
                ApiKey key = ApiKey.GetByEmail(email);
                if (key != null)
                {
                    // reset...
                    string password = key.ResetPassword();

                    // send...
                    IDictionary values = CollectionsUtil.CreateCaseInsensitiveHashtable();
                    values["password"] = password;
                    EmailHelper.SendEmail(EmailKeys.ForgotPassword, key, values);

                    // show...
                    this.widgetFeedback.SetInfo("Your new password has been sent.");
                }
                else
                    checker.AddError(string.Format("An account for email address '{0}' was not found.", email));
            }

            // show...
            if (checker.HasErrors)
                this.widgetFeedback.SetError(checker);
        }
        void buttonLogon_Click(object sender, EventArgs e)
        {
            this.widgetFeedback.Reset();

            // get...
            FormChecker checker = new FormChecker(this);
            string username = checker.GetStringValue(new ControlReference(this.textUsername, "Username"), true);
            string password = checker.GetStringValue(new ControlReference(this.textPassword, "Password"), true);

            // not...
            if (!(checker.HasErrors))
            {
                // find...
                ApiKey key = ApiKey.GetByUsername(username);
                if (key != null)
                {
                    if (key.IsActive)
                    {
                        // password...
                        string hashed = EncryptionHelper.HashPasswordToBase64String(password, key.PasswordSalt);
                        if (hashed == key.PasswordHash)
                        {
                            // logon...
                            RememberUserFlags flags = RememberUserFlags.DoNotRememberUsers;
                            if(this.checkRemember.Checked)
                                flags = RememberUserFlags.UsernameAndPassword;
                            this.Logon(key, flags, new TimeSpan(90, 0, 0, 0));

                            // go...
                            this.Response.Redirect("~/default.aspx");
                        }
                        else
                            checker.AddError("The password is invalid.");
                    }
                    else
                        checker.AddError("The API account is not active.");
                }
                else
                    checker.AddError("The username is invalid.");
            }

            // show...
            if (checker.HasErrors)
                this.widgetFeedback.SetError(checker);
        }
        void buttonEmail_Click(object sender, EventArgs e)
        {
            this.widgetEmailFeedback.Reset();
            this.widgetPasswordFeedback.Reset();

            FormChecker checker = new FormChecker();
            string email = checker.GetStringValue(new ControlReference(this.textEmail, "Email"), true);

            // check...
            if (!(checker.HasErrors))
            {
                // get...
                ApiKey existing = ApiKey.GetByEmail(email);
                if (existing == null)
                {
                    // set...
                    this.CurrentUser.Email = email;
                    this.CurrentUser.SaveChanges();

                    // show...
                    this.widgetEmailFeedback.SetInfo("The email address has been changed.");
                }
                else
                {
                    // us?
                    if(CurrentUser == null)
	                    throw new InvalidOperationException("'CurrentUser' is null.");
                    if (existing.ApiKeyId == this.CurrentUser.ApiKeyId)
                        checker.AddError("Please enter a new email address.");
                    else
                        checker.AddError("Another account is already using this email address.");
                }
            }

            // show...
            if (checker.HasErrors)
                this.widgetEmailFeedback.SetError(checker);
        }
        void buttonSave_Click(object sender, EventArgs e)
        {
            this.widgetFeedback.Reset();

            // get...
            FormChecker checker = new FormChecker();
            string username = checker.GetStringValue(new ControlReference(this.textUsername, "Username"), true);
            string password = checker.GetStringValue(new ControlReference(this.textPassword, "Password"), true);
            string confirm = checker.GetStringValue(new ControlReference(this.textConfirm, "Confirm"), true);
            string firstName = checker.GetStringValue(new ControlReference(this.textFirstName, "First name"), true);
            string lastName = checker.GetStringValue(new ControlReference(this.textLastName, "Last name"), true);
            string company = checker.GetStringValue(new ControlReference(this.textCompany, "Company"), true);
            string address1 = checker.GetStringValue(new ControlReference(this.textAddress1, "Address 1"), true);
            string address2 = checker.GetStringValue(new ControlReference(this.textAddress2, "Address 2"), false);
            string address3 = checker.GetStringValue(new ControlReference(this.textAddress3, "Address 3"), false);
            string city = checker.GetStringValue(new ControlReference(this.textCity, "City/town"), true);
            string region = checker.GetStringValue(new ControlReference(this.textRegion, "Region/county"), false);
            string postalCode = checker.GetStringValue(new ControlReference(this.textPostalCode, "Postal code/postcode"), true);
            Country country = (Country)checker.GetEntity(new ControlReference(this.listCountry, "Country"), typeof(Country), true);
            string email = checker.GetStringValue(new ControlReference(this.textEmail, "Email"), true);

            // not...
            if (!(checker.HasErrors))
            {
                // check...
                if (password == confirm)
                {
                    // find...
                    ApiKey existing = ApiKey.GetByUsername(username);
                    if (existing == null)
                    {
                        // check email...
                        ApiKey byUser = ApiKey.GetByEmail(email);
                        if(byUser == null)
                        {
                            // create...
                            ApiKey key = new ApiKey();
                            key.Username = username;
                            key.SetPassword(password, false);
                            key.FirstName = firstName;
                            key.LastName = lastName;
                            key.Company = company;
                            key.Address1 = address1;
                            key.Address2 = address2;
                            key.Address3 = address3;
                            key.City = city;
                            key.Region = region;
                            key.PostalCode = postalCode;
                            key.Country = country;
                            key.Email = email;
                            key.Subscribe = this.checkSubscribe.Checked;
                            key.IsActive = true;

                            // save...
                            key.SaveChanges();

                            // send...
                            EmailHelper.SendEmail(EmailKeys.NewRegistration, key);

                            // logon...
                            this.Logon(key, RememberUserFlags.DoNotRememberUsers, TimeSpan.MinValue);
                            
                            // redirect...
                            this.Response.Redirect("~/");
                        }
                        else
                            checker.AddError(string.Format("The email address '{0}' has already been used.", email));
                    }
                    else
                        checker.AddError(string.Format("The username '{0}' already exists.", username));
                }
                else
                    checker.AddError("Passwords do not match.");
            }

            // not...
            if (checker.HasErrors)
                this.widgetFeedback.SetError(checker);
        }