Decrypt for password with formsauthentication

with the article
http://www.devasp.net/net/articles/display/247.html

it uses FormsAuthentication.HashPasswordForStoringInConfigFile
to encrypt password,
but to decrypt it,
i attempt to use

FormsAuthenticationTicket faticket = FormsAuthentication.Decrypt(txtShowValue.Text);
lblresults.Text = faticket.Name.ToString();

getting the error : Unable to validate data
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doramail05Asked:
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Umar TopiaConnect With a Mentor .Net Full Stack DeveloperCommented:
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rajvjaCommented:
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doramail05Author Commented:
i guess most of the post were saying unable to decrypt else security breach.
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