# TlsOptions.LocalClientCertificateSelector

[Type overview](/orleans/docs/api/csharp/microsoft.orleans.connections.security/orleans.connections.security.tlsoptions/) | [Properties](/orleans/docs/api/csharp/microsoft.orleans.connections.security/orleans.connections.security.tlsoptions/properties/)

[Source](https://github.com/dotnet/orleans/blob/b7a9e3e1c9c54b3cec3a467c5734bf7744541bcf/src/Orleans.Connections.Security/Security/TlsOptions.cs)

```csharp
public Func<object, string, X509CertificateCollection, X509Certificate?, string[], X509Certificate2?>? LocalClientCertificateSelector
```

A callback that will be invoked to dynamically select a local client certificate. This is higher priority than LocalCertificate.

If the certificate has an Extended Key Usage extension, the usages must include Client Authentication (OID 1.3.6.1.5.5.7.3.2).