Question

I made the same ASP.NET C# project in both VS2010 and MonoDevelop using these two classes among the standard files (Site.Master, Web.Config, Default.aspx, etc.) and recieve this same error (CS0234) seen at the bottom.

Login.cs:

using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.UI;
using System.Web.UI.HtmlControls;
using mynamespace;

namespace mynamespace
{
    public partial class Logon 
    {
        public void btnClicked(object sender, EventArgs e)
        {

            //ERROR IS HERE:
        mynamespace.Test session = new mynamespace.Test();

            //Obviously, this doesn't work either:
            Response.Write(session.echoUser());

        }
    }

}

Test.cs:

using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using mynamespace;

namespace mynamespace
{
    public class Test
    {
        public string echoUser()
        {
            return "foobar";
        }
    }
}

I recieve the same error in both IDEs, here is the MonoDevelop error:

The type or namespace ‘Test’ does not exist in the namespace ‘mynamespace’ (are you missing an assembly reference?) (CS0234) Logon.cs

Basically, the class Test refuses to instantiate. Any input is appreciated!

Answer 1

If you have that Test class in an ASP.Net web project, then you need to place it in the App_Code folder, not just anywhere in the site.