How to get VaultProperties.NetworkAcls property from Azure Key Vault

Question

I need to extract Firewalls and virtual networks properties of a azure key vault and it look like the property I'm after is VaultProperties.NetworkAcls

This is documented at https://docs.microsoft.com/en-us/dotnet/api/microsoft.azure.management.keyvault.models.vaultproperties.networkacls?view=azure-dotnet#Microsoft_Azure_Management_KeyVault_Models_VaultProperties_NetworkAcls

However I do not understand how to extract this property.

I'm using VS 2017 c# .net core 2.1

I already have Azure SKR installed and I have Microsoft.Azure.Management.Fluent 1.19.0 installed

I cannot find Microsoft.Azure.Management.KeyVault.Models.VaultProperties However what I can find is this

VaultProperties

Thanks Eranga