Add a formaction demo

Pages/Demos/FormAction.cshtml

@@ -0,0 +1,14 @@
+@page
+@model DemoWeb.Pages.Demos.FormAction
+
+
+@{
+    Layout = "Shared/_Layout";
+}
+
+<partial name="Shared/_StatusMessage" model="Model.StatusMessage"/>
+
+<form method="post">
+    <input type="submit" value="Submit" asp-page-handler="Submit" />
+    <input type="submit" value="Save" asp-page-handler="Save"/>
+</form>

Pages/Demos/FormAction.cshtml.cs

@@ -0,0 +1,25 @@
+using Microsoft.AspNetCore.Mvc;
+using Microsoft.AspNetCore.Mvc.RazorPages;
+
+namespace DemoWeb.Pages.Demos;
+
+public class FormAction : PageModel
+{
+    [TempData]
+    public string? StatusMessage { get; set; }
+
+
+    public IActionResult OnPostSubmitAsync()
+    {
+        StatusMessage = "Submit button clicked";
+
+        return RedirectToPage();
+    }
+
+    public IActionResult OnPostSave()
+    {
+        StatusMessage = "Save button clicked";
+
+        return RedirectToPage();
+    }
+}

Pages/Index.cshtml

@@ -10,6 +10,7 @@
     <li><a asp-page="Demos/SubmitButton">Submit Button</a></li>
     <li><a asp-page="Demos/RemovedInputs">Removed Inputs</a></li>
     <li><a asp-page="Demos/SelectInput">Select Input and Validation Summary</a></li>
+    <li><a asp-page="Demos/FormAction">Form Action</a></li>
 </ul>
 
 @if (Model.StatusMessage != null) {