Public Static Class in same namespace as web form can't be resolved

Question

I have a Webform MVP project and have some extensions methods declared in a class at App_Code folder that are not resolved in my webform code behind. both Webform and Static Class are in same namespace but something seems to not be working...

I did a quick sample to show you the issue...

Class at App_Code:

namespace ecommerce.mvp
{
    public static class Class1
    {
        public static void Test1()
        {

        }

    }
}

Code Behind:

using System;
using System.Collections.Generic;
using System.Web.UI;
using System.Web.UI.HtmlControls;
using System.Web.UI.WebControls;


namespace ecommerce.mvp
{
    public partial class pdp : System.Web.UI.Page
    {
        protected void Page_Load(object sender, EventArgs e)
        {
            Class1.Test1(); // <--- This symbol can't be resolved

Notice that both are at same namespace...but for some reason Class1 is not resolved at code behind...

I really will appreciate any help on that one. Thanks.

Answer 1

Right click on your Class1.cs class in the App_Code folder and check its properties. Build Action must be set to Compile . (Sometimes it is set to Content )

Answer 2

Just because 2 classes share the same namespace does not mean they are automatically visible to each other if they are in different assemblies/projects .

The only way I can see you having this problem is if Class1 is in assembly/project "Foo" (a made up name), and class pdp is in assembly/project "Bar" (another made up name).

To resolve this you'd need to add a reference to the assembly holding Class1 to the assembly holding pdp .

Answer 3

I faced similar problem, however, it was a different 'Project' that was complaining. In my case, I found out that there were some .cs files which were included as 'link', and I did not include my new .cs file as 'link' in the project that was complaining. Hope this might help someone who stumbles upon this. So, a word of advice: When error is listed in 'Error list', also check the 'Project' column as well.