Why current user is not updating?

Cant able to update the current user? why? CV is just a string field,not only cv,if I set firstname or lastname,still cant able to update it.Why?

UserInfo currentUser = UserInfoProvider.GetUserInfo(CurrentUser.UserID);
currentUser.SetValue("CV", file);
currentUser.Update();

membership user userinfo

Can you verify that the user obj isn't null and that the field CV exists on the user table?

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When you add custom fields, I believe they all go to the UserSettings object. Have you tried currentUser.UserSettings.SetValue("CV", file");

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Try UserInfoProvider.SetUserInfo(currentUser);

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