Greeting everyone,

I have recently started working with asp.net , and deceided to jump to asp.net mvc. I am familiar with MVC and I used it to make application alot more robust.

I took time to get familiarise with MVC , and decided to make changes to the system to fit my needs. I donot prefer to have an extra click to login, so i decided to have loginform in LogOnUserControl.ascx . Please note that all the code I am using so far is provided by MVC application itself. I have just make teeny tiny adjustment. Following is my LogOnUserControl.ascx

<%@ Control Language="C#" Inherits="System.Web.Mvc.ViewUserControl" %>
<%
    if (Request.IsAuthenticated)
    {
%>
Welcome <b>
    <%= Html.Encode(Page.User.Identity.Name) %></b>! [
<%= Html.ActionLink("Log Off", "LogOff", "Account") %>
]
<%
    }
    else
    {
%>
<%= Html.ValidationSummary("Login was unsuccessful. Please correct the errors and try again.") %>
<% using (Html.BeginForm("LogOn", "Account"))
   { %>
<div id="loginForm">
    <fieldset>
        <legend>Login</legend>
        <p>
            <label for="username">
                Username:</label>
            <%= Html.TextBox("username")%>
            <%= Html.ValidationMessage("username")%>
        </p>
        <p>
            <label for="password">
                Password:</label>
            <%= Html.Password("password")%>
            <%= Html.ValidationMessage("password")%>
        </p>
        <p>
            <%= Html.CheckBox("rememberMe")%>
            <label class="inline" for="rememberMe">
                Remember me?</label>
        </p>
        <p>
            <input type="submit" value="Log On" />
        </p>
    </fieldset>
    
</div>
<%
   } 
        %>
<div id="registerHere">
    <fieldset>
        <legend>Register</legend>
        <p>
            Please enter your username and password.
            <%= Html.ActionLink("Register","Register","Account") %>
            if you don't have an account.
        </p>
    </fieldset>
</div>
<%
    
    }
%>

Now the problem is that is the I can't login from this form. I get following error:

Server Error in '/' Application. Validation of viewstate MAC failed. If this application is hosted by a Web Farm or cluster, ensure that <machineKey> configuration specifies the same validationKey and validation algorithm. AutoGenerate cannot be used in a cluster.

I am not sure why I am getting error regarding it. I tried googling but solution provided didn't help much. Solution including removing form tags from site.master.

Your help is alot appreciated.

Thanks

With Regards

-Umang

uniqueumang:

Validation of viewstate MAC failed

<pages enableEventValidation="false" viewStateEncryptionMode ="Never" />

 http://blogs.msdn.com/tom/archive/2008/03/14/validation-of-viewstate-mac-failed-error.aspx

http://aspadvice.com/blogs/joteke/archive/2006/02/02/15011.aspx