Reset the value of textarea after form submission

Question

1. I want to send a message to userID=3 by going to /MyController/Message/3
2. This executes Message() [get] action, I enter some text in the text area and click on Save to post the form
3. Message() [post] action saves the changes, resets the value of SomeText to empty string and returns to the view.

At this point I expect the text area to be empty because I have set ViewData["SomeText"] to string.Empty.

Why is text area value not updated to empty string after post action?

Here are the actions:

[AcceptVerbs(HttpVerbs.Get)] public ActionResult Message(int ID) {   ViewData["ID"] = ID;   return View(); }  [AcceptVerbs(HttpVerbs.Post)] public ActionResult Message(int ID, string SomeText) {   // save Text to database   SaveToDB(ID, SomeText);    // set the value of SomeText to empty and return to view   ViewData["SomeText"] = string.Empty;   return View(); } 

And the corresponding view:

<%@ Page Title="" Language="C#" MasterPageFile="~/Views/Shared/Site.Master"     Inherits="System.Web.Mvc.ViewPage" %> <asp:Content ID="Content1" ContentPlaceHolderID="MainContent" runat="server"> <% using (Html.BeginForm())     { %>       <%= Html.Hidden("ID", ViewData["ID"])%>       <label for="SomeText">SomeText:</label>       <%= Html.TextArea("SomeText", ViewData["SomeText"]) %>       <input type="submit" value="Save" /> <% } %> </asp:Content> 

Answer 1

The problem is that your ModelState is re-filled with the posted values.

What you can do is clear it on the Action that has the Post attribute :

ModelState.Clear();