---
title: "LocalDBShareInstance Function | Microsoft Docs"
ms.custom: ""
ms.date: "03/06/2017"
ms.prod: sql
ms.prod_service: "database-engine"
ms.reviewer: ""
ms.technology: 
ms.topic: "reference"
apiname: 
  - "LocalDBShareInstance"
apilocation: 
  - "sqluserinstance.dll"
apitype: "DLLExport"
ms.assetid: 21eb3b9a-7d32-455b-89bb-f624198cd202
author: "CarlRabeler"
ms.author: "carlrab"
---
# LocalDBShareInstance Function
[!INCLUDE[appliesto-ss-xxxx-xxxx-xxx-md](../../includes/appliesto-ss-xxxx-xxxx-xxx-md.md)]
  Shares the specified SQL Server Express LocalDB instance with other users of the computer, using the specified shared name.  
  
 **Header file:** sqlncli.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](../../relational-databases/express-localdb-error-messages/localdb-error-not-installed.md)  
 SQL Server Express LocalDB is not installed on the computer.  
  
 [LOCALDB_ERROR_INVALID_PARAMETER](../../relational-databases/express-localdb-error-messages/localdb-error-invalid-parameter.md)  
 One or more specified input parameters are invalid.  
  
 [LOCALDB_ERROR_INVALID_INSTANCE_NAME](../../relational-databases/express-localdb-error-messages/localdb-error-invalid-instance-name.md)  
 The specified instance name is invalid.  
  
 [LOCALDB_ERROR_UNKNOWN_INSTANCE](../../relational-databases/express-localdb-error-messages/localdb-error-unknown-instance.md)  
 The specified instance does not exist.  
  
 [LOCALDB_ERROR_ADMIN_RIGHTS_REQUIRED](../../relational-databases/express-localdb-error-messages/localdb-error-admin-rights-required.md)  
 Administrator privileges are required in order to execute this operation.  
  
 [LOCALDB_ERROR_SHARED_NAME_TAKEN](../../relational-databases/express-localdb-error-messages/localdb-error-shared-name-taken.md)  
 The specified shared name is already taken.  
  
 [LOCALDB_ERROR_INSTANCE_ALREADY_SHARED](../../relational-databases/express-localdb-error-messages/localdb-error-instance-already-shared.md)  
 The specified instance is already shared.  
  
 [LOCALDB_ERROR_INTERNAL_ERROR](../../relational-databases/express-localdb-error-messages/localdb-error-internal-error.md)  
 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](../../relational-databases/sql-server-express-localdb-reference.md).  
  
## See Also  
 [SQL Server Express LocalDB Header and Version Information](../../relational-databases/express-localdb-instance-apis/sql-server-express-localdb-header-and-version-information.md)