The PRG (Post-Redirect-Get) pattern is a common web development design pattern used to handle form submissions in a user-friendly and consistent way. It is especially helpful when dealing with form submissions to avoid issues like double form submissions due to page refresh or back button clicks.

In ASP.NET MVC, the PRG pattern can be implemented as follows:

  1. POST Action: When the user submits a form, it is typically handled by a POST action in the controller. This action processes the form data, performs any necessary operations (e.g., saving data to the database), and then redirects the user to another action using the RedirectToAction method.

    [HttpPost] public ActionResult SubmitForm(FormModel model) { // Process form data and perform necessary operations // Save data to the database, etc. // Redirect to another action using the PRG pattern return RedirectToAction("Success"); }
  2. Redirected GET Action: After processing the form submission, the POST action redirects the user to another GET action, typically used to display a success message or a thank-you page. This is the action that the user will see after the form submission, and it helps avoid form resubmission issues.

    public ActionResult Success() { // You can perform any necessary data retrieval or other logic here // before rendering the view. return View(); }
  3. Success View: Create a view for the "Success" action that displays the success message or any relevant information to the user.

    <!-- Success.cshtml --> <h2>Form Submitted Successfully</h2> <p>Thank you for submitting the form.</p>

By using the PRG pattern in ASP.NET MVC, you can ensure that form submissions are properly handled, and users are redirected to a separate GET action after a successful form submission. This helps avoid form resubmission issues when users refresh the page or click the back button in their browsers.

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