ParseUserLogOutAsync Method Parse
Logs out the currently logged in user session. This will remove the session from disk, log out of linked services, and future calls to CurrentUser will return null.

Namespace: Parse
Assembly: Parse (in Parse.dll) Version: 1.5.5.0 (1.5.5.0)
Syntax

public static Task LogOutAsync()

Return Value

Type: Task
Remarks

This is preferable to using LogOut, unless your code is already running from a background thread.
See Also

Reference