> ## Documentation Index
> Fetch the complete documentation index at: https://devdocs.xbox.com/llms.txt
> Use this file to discover all available pages before exploring further.

# XblMultiplayerManagerLobbySessionSetLocalMemberProperties

> XblMultiplayerManagerLobbySessionSetLocalMemberProperties

# XblMultiplayerManagerLobbySessionSetLocalMemberProperties

Set a custom property for a local member to the specified JSON string.

## Syntax

```cpp theme={null}
HRESULT XblMultiplayerManagerLobbySessionSetLocalMemberProperties(  
         XblUserHandle user,  
         const char* name,  
         const char* valueJson,  
         void* context  
)  
```

### Parameters

*user*   \_In\_\
Type: XblUserHandle

The user you want to set the property for.

*name*   \_In\_z\_\
Type: char\*

The name of the property to set.

*valueJson*   \_In\_z\_\
Type: char\*

Optional. The JSON value to assign to the property.

*context*   \_In\_opt\_\
Type: void\*

Optional. The application-defined data to correlate the [XblMultiplayerEvent](/reference/live/xsapi-c/multiplayer_manager_c/structs/xblmultiplayerevent) to the initiating call.

### Return value

Type: HRESULT

HRESULT return code for this API operation.

## Remarks

This function sets the value, represented as a JSON string, of a custom property for a local member in the lobby session. Custom properties can be changed at any time. Changes are batched and written to the service when [XblMultiplayerManagerDoWork](/reference/live/xsapi-c/multiplayer_manager_c/functions/xblmultiplayermanagerdowork) is called. <br />The result of this function is delivered as a multiplayer event with an event type set to `XblMultiplayerEventType::LocalMemberPropertyWriteCompleted`. You can call [XblMultiplayerManagerDoWork](/reference/live/xsapi-c/multiplayer_manager_c/functions/xblmultiplayermanagerdowork) to retrieve multiplayer events.

## Requirements

**Header:** multiplayer\_manager\_c.h

**Library:** Microsoft.Xbox.Services.14x.GDK.C.lib

## See also

[multiplayer\_manager\_c](/reference/live/xsapi-c/multiplayer_manager_c/multiplayer_manager_c_members)\
[XblMultiplayerManagerGameSessionSetSynchronizedHost](/reference/live/xsapi-c/multiplayer_manager_c/functions/xblmultiplayermanagergamesessionsetsynchronizedhost)\
[XblMultiplayerEvent](/reference/live/xsapi-c/multiplayer_manager_c/structs/xblmultiplayerevent)


## Related topics

- [XblMultiplayerManagerLobbySessionDeleteLocalMemberProperties](/reference/live/xsapi-c/multiplayer_manager_c/functions/xblmultiplayermanagerlobbysessiondeletelocalmemberproperties.md)
- [XblMultiplayerManagerLobbySessionSetLocalMemberConnectionAddress](/reference/live/xsapi-c/multiplayer_manager_c/functions/xblmultiplayermanagerlobbysessionsetlocalmemberconnectionaddress.md)
- [Multiplayer Manager API overview](/services/xbox-services/multiplayer/mpm/concepts/live-multiplayer-manager-api-overview.md)
- [XblMultiplayerEventType](/reference/live/xsapi-c/multiplayer_manager_c/enums/xblmultiplayereventtype.md)
- [XblMultiplayerManagerLobbySessionAddLocalUser](/reference/live/xsapi-c/multiplayer_manager_c/functions/xblmultiplayermanagerlobbysessionaddlocaluser.md)