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The MembershipProvider.ApplicationName property value is stored in the data source with related user information to associate a user with a particular application. This property is read/write and defaults to the System.Web.HttpRequest.ApplicationPath property value if not specified explicitly.
Because membership providers store user information uniquely for each application, multiple ASP.NET applications can use the same data source without running into a conflict if duplicate user names are created. Alternatively, multiple ASP.NET applications can use the same user data source by specifying the same MembershipProvider.ApplicationName.
In your membership provider implementation, you will need to ensure that your data schema includes the MembershipProvider.ApplicationName and that data source queries and updates also include the MembershipProvider.ApplicationName.