Controller websockets

public class DatabaseNotificationController : ApiController
{
public HttpResponseMessage Get()
{
HttpContext.Current.AcceptWebSocketRequest(new ChatWebSocketHandler());
return Request.CreateResponse(HttpStatusCode.SwitchingProtocols);
}
class ChatWebSocketHandler : Microsoft.Web.WebSockets.WebSocketHandler
{
public ChatWebSocketHandler()
{
SetupNotifier();
}
protected void SetupNotifier()
{
using (var connection = new SqlConnection(ConfigurationManager.ConnectionStrings["DefaultConnection"].ConnectionString))
{
connection.Open();
using (SqlCommand command = new SqlCommand(@"SELECT [FullName],[experiance_nYears] FROM [dbo].[t_Doctor]", connection))
{
command.Notification = null;
SqlDependency dependency = new SqlDependency(command);
dependency.OnChange += new OnChangeEventHandler(dependency_OnChange);
if (connection.State == ConnectionState.Closed)
{
connection.Open();
}
var reader = command.ExecuteReader();
                        reader.Close();
                    }
                }
            }

            private static WebSocketCollection _chatClients = new WebSocketCollection();

            public override void OnOpen()
            {
                _chatClients.Add(this);
            }

            public override void OnMessage(string msg)
            {

            }

            private void dependency_OnChange(object sender, SqlNotificationEventArgs e)
            {
                _chatClients.Broadcast(string.Format("Data changed on {0}", DateTime.Now.ToString("yyyy-MM-dd HH:mm:ss")));
                SetupNotifier();
            }
        }

    }