использую в signalR

    public class ExampleHub : Hub, ITransientDependency
{
        public override Task OnConnected()
        {
            Storage.ConnStr = WebConfigurationManager.ConnectionStrings["Default"].ConnectionString;
            SqlDependency.Start(Storage.ConnStr);
            Storage.Connection = new SqlConnection(Storage.ConnStr);
            Storage.Connection.Open();
            Storage.Command = new SqlCommand("SELECT [State] FROM[Test].[dbo].[State]", Storage.Connection);
            Storage.Dependency = new SqlDependency(Storage.Command);
            Storage.Dependency.OnChange += Dependency_OnChange;
            Storage.Command.ExecuteReader();
.......

        private void Dependency_OnChange(object sender, SqlNotificationEventArgs e)
        {

        }
......
    public static class Storage
    {
        public static bool IsEnabled;
        public static SqlConnection Connection;
        public static SqlCommand Command;
        public static SqlDependency Dependency;
        public static string ConnStr;
    }

Dependency_OnChange вызывается сразу после ExecuteReader и только 1 раз, во время изменений в базе ничего не происходит