SharePoint 2010 - LDAP membership provider for FBA prefixes “i:0#.f|”

SharePoint 2010 - LDAP membership provider for FBA prefixes “i:0#.f|” .

if you are adding SharePoint user profile with code follow this format

"i:0#.f|lmymembershipprovider|myuserid"

mymembershipprovider : is the name of membership provider you defined in your web.config file
myuserid: "user id"

it is necessary to prefix the userid with membership provider if you defined multiple membership providers in your config file.
If you don't prefix "i:0#.f|" ('f' stands for Form Based Authentication) for an FBA user, Sharepoint won't identify the user when trying access userprofile store and may throw a security exception.

If you are yelling " WHY...???".......it's "SHAREPOINT" :)

Note : for windows authentication, the format is i:0#.w ('w' stands for windows)

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