Create contact from ASP.Net page

 ServicePointManager.SecurityProtocol = SecurityProtocolType.Tls12
        Dim service As CrmServiceClient = New CrmServiceClient(ConfigurationManager.ConnectionStrings("CRM").ConnectionString)
        Dim contact As Entity = New Entity("contact")
        Dim lang As String = "7ed34d80-5755-e511-80e9-3863bb34ea78" ' us english
        Dim langGuid As Guid = New Guid(lang)


        contact("firstname") = "Stuie"
        contact("lastname") = "Green"
        contact("emailaddress1") = "stuapitest@xxx.com"
        contact("tri_sitelanguageid") = langGuid
        contact("tri_al_atpcampaign") = "test Form"
        contact("tri_al_country") = "USA"
        contact("tri_al_enquiry") = "testing"
        contact("new_testid") = langGuid

        Try
            service.Create(contact)
        Catch ex As Exception
            Response.Write(ex.Message)
            Response.End()
        End Try