Error in owin startup class visual studio 2012

c#, owin, signalr

Solution

Was facing the same problem. Tried adding assembly level attribute, as suggested by @Praburaj

You can try the following.

using Microsoft.AspNet.SignalR;
using Microsoft.Owin.Security;
using Owin;

//add the attribute here
[assembly: OwinStartup(typeof(SignalRTutorials.Startup))]

namespace SignalRTutorials
{
    public class Startup
    {
        public void Configuration(IAppBuilder app)
        {
            app.MapSignalR();
        }

    }
}

Problem

I am new to signal r and I am trying to create a basic chat application in c# visual studio 2012 but i am getting following error. ``` The following errors occurred while attempting to load the app. - No assembly found containing an OwinStartupAttribute. - The discovered startup type 'SignalRTutorials.Startup, SignalRTutorials, Version=1.0.0.0, Culture=neutral, PublicKeyToken=null' conflicts with the type 'Microsoft.VisualStudio.Web.PageInspector.Runtime.Startup, Microsoft.VisualStudio.Web.PageInspector.Runtime, Version=1.0.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a'. Remove or rename one of the types, or reference the desired type directly. To disable OWIN startup discovery, add the appSetting owin:AutomaticAppStartup with a value of "false" in your web.config. To specify the OWIN startup Assembly, Class, or Method, add the appSetting owin:AppStartup with the fully qualified startup class or configuration method name in your web.config. ``` I have created 3 files: 1) first is Letschat.cs class as: ``` using System; using System.Collections.Generic; using System.Linq; using System.Web; using Microsoft.AspNet.SignalR; using Microsoft.AspNet.SignalR.Hubs; namespace SignalRTutorials { [HubName("myChatHub")] public class LetsChat:Hub { public void send(string message) { Clients.All.addMessage(message); } } } ``` 2) second file chat.aspx as ``` <%@ Page Language="C#" AutoEventWireup="true" CodeBehind="Chat.aspx.cs" Inherits="SignalRTutorials.Chat" %> <!DOCTYPE html> <html xmlns="http://www.w3.org/1999/xhtml"> <head runat="server"> <title></title> <script src="Scripts/jquery-1.6.4.min.js"></script> <script src="Scripts/jquery-1.6.4-vsdoc.js"></script> <script src="Scripts/jquery-1.6.4.min.js"></script> <script src="Scripts/jquery.signalR-2.0.0.js"></script> <script src="Scripts/jquery.signalR-2.0.0.min.js"></script> </head> <body> <form id="form1" runat="server"> <script type="text/javascript"> $(function() { var IWannaChat=$.connection.myChatHub; IWannaChat.client.addMessage=function(message){ $('#listMessages').append('<li>'+message+'</li>'); }; $("#SendMessage").click(function(){ IWannaChat.server.send($('#txtMessage').val()); }); $.connection.hub.start(); }); </script> <div> <input type="text" id="txtMessage" /> <input type="text" id="SendMessage" value="broadcast" /> <ul id="listMessages"> </ul> </div> </form> </body> </html> ``` 3) class Named as Startup.cs ``` using System; using System.Collections.Generic; using System.Linq; using System.Net; using System.Threading.Tasks; using System.Web; using System.Web.Routing; using Microsoft.AspNet.SignalR; using Microsoft.Owin.Security; using Owin; namespace SignalRTutorials { public class Startup { public void Configuration(IAppBuilder app) { app.MapSignalR(); } } } ``` I dont know where i am doing wrong any help in this regard will be appreciated.

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