Cannot login to Facebook from Windows Phone

Effects:
I connected to https://m.facebook.com/login.php, using my Nokia Lumia 800 with Windows Phone 7.8, but inserting the correct credentials I cannot login: the browser refreshes the page showing the alert “You must login first.”.
I thought I had forgotten my credentials…

Cannot login to Facebook from Windows Phone

Solution:
Go to settings of Internet Explorer and place a tick on “Allow cookies on my phone” check box.

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The name ‘DisplayModes’ does not exist in the current context

The name ‘DisplayModes’ does not exist in the current context

The error above is caused from the following code:

@{
    Layout = "~/Views/Shared/_Layout.cshtml";
    DisplayModes.RequireConsistentDisplayMode = true;
}

Solution:

Replace

DisplayModes.RequireConsistentDisplayMode = true;

with

DisplayModeProvider.Instance.RequireConsistentDisplayMode = true;

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