You created a custom ASPX page that updates a list. The page is deployed to the _layouts folder.

The page contains the following code segment. (Line numbers are included for reference only.)

01 <form id=”Form1″ runat=”Server”>
02 <asp:Button id=”btnUpdate” runat=”server” Text=”Update”></asp:Button>
03 </form>

A user attempts to update the list by using the page and receives the following error message: “The security validation for this page is invalid”.

You need to prevent the error from occurring.

Which control should you include in Form1?

A.
EncodedLiteral

B.
FormDigest

C.
InputFormCustomValidator

D.
UIVersionedContent

Explanation:
MNEMONIC RULE: “Digest your security”

FormDigest Class
http://msdn.microsoft.com/en-us/library/microsoft.sharepoint.webcontrols.formdigest.aspx