LocalDBShareInstance Function
Applies to: 
SQL Server
Shares the specified SQL Server Express LocalDB instance with other users of the computer, using the specified shared name.
Header file: msoledbsql.h
Syntax
HRESULT LocalDBShareInstance(
PSID pOwnerSID,
PCWSTR pInstancePrivateName,
PCWSTR pInstanceSharedName,
DWORD dwFlags
);
Parameters
pOwnerSID
[Input] The SID of the instance owner.
pInstancePrivateName
[Input] The private name for the LocalDB instance to share.
pInstanceSharedName
[Input] The shared name for the LocalDB instance to share.
dwFlags
[Input] Reserved for future use. Currently should be set to 0.
Returns
S_OK
The function succeeded.
LOCALDB_ERROR_NOT_INSTALLED
SQL Server Express LocalDB is not installed on the computer.
LOCALDB_ERROR_INVALID_PARAMETER
One or more specified input parameters are invalid.
LOCALDB_ERROR_INVALID_INSTANCE_NAME
The specified instance name is invalid.
LOCALDB_ERROR_UNKNOWN_INSTANCE
The specified instance does not exist.
LOCALDB_ERROR_ADMIN_RIGHTS_REQUIRED
Administrator privileges are required in order to execute this operation.
LOCALDB_ERROR_SHARED_NAME_TAKEN
The specified shared name is already taken.
LOCALDB_ERROR_INSTANCE_ALREADY_SHARED
The specified instance is already shared.
LOCALDB_ERROR_INTERNAL_ERROR
An unexpected error occurred. See the event log for details.
Remarks
For a code sample that uses LocalDB API, see SQL Server Express LocalDB Reference.