CODEWITHSUNDEEP
c#asp.net
Matthew2468
Matthew2468

Reputation: 71

CS0234 - Cannot Instantiate C# class in ASP.NET

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!

Upvotes: 1

Views: 604

Answers (3)

Hans Kesting
Hans Kesting

Reputation: 39284

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.

Upvotes: 1

Tim Booker
Tim Booker

Reputation: 2789

If these are both in the same project, please check that both files are included in the project and have the "Build Action" property set to "Compile". Please also check that all of these namespaces have exactly matching spelling and casing.

Upvotes: 0

user1919730
user1919730

Reputation:

You need to refer the projects to each other, if you haven't done so yet. I'm guessing that you don't get the intellisense to show the class in the other namespace, right?

You can see the References on the right side (most cases) under your project view. You can right click there and choose to Add reference. Then you browse to the binaries from the pther projects. (You might be able to point to the project itself too - I don't have VS in front of me at the moment.)

Also, It's a convention to use camel case for namespaces, so it should be MyNameSpace.

If the classes are in the same project, you might want to skip using mynamespace and refer to the class by Test intead of mynamespace.Test.

Upvotes: 1

Related Questions