MVC4 validation summary not showing

Question

Have created a model and with required fields and used to create a form like so:

Model:

public class formModel {
    [Required]
    public string name {get;set;}
    [Required]
    public string Add1 {get;set;}
    etc....
}

View:

@model myProj.Models.formModel

@using (BeginForm("Action", "Controller", FormMethod.Post))
{
    @Html.TextBoxFor(f => f.name)
    @Html.TextBoxFor(f => f.Add1)
    etc...

    @Html.ValidationSummary()
    <button type="submit" value="submit">Submit</button>
}

Controller:

[HttpPost]
public ActionResult Action(formModel f)
{
    if (ModelState.IsValid)
    {
        // Do Stuff here
        return RedirectToAction("Result");
    }
    return RedirectToAction("Form", new { id = "showForm" });
 }

Problem is the validation summary is being displayed if the model is in valid. Have used same approach on lots of other forms and has been fine.

Any ideas?

Answer 1

When the model is invalid, do not use

return RedirectToAction("Form");

But

return View(f); // or return View("ViewName", f);