Getting state value from auth0 response using Auth0.OidcClient

Hello I hope this would be the right place to ask, currently I have the implementation of passing a state value in my application as such;

        var extraParams = new Dictionary<string, string>
            { "state=", stateValue.ToString() }
        var client = await Authentication.Client.LoginAsync(extraParameters: extraParams);

Where statevalue is rng and stored, however is there no way to retrieve this value to confirm using this lib?