I can't see a referenced class of another namespace in C#

Question

I have 2 projects:

• ConstrainedScheduleInterfaces
• ConstrainedSchedule that has a folder (Testing) with my class that need the reference, here's the code:

Tests.cs:

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using 
using NUnit.Framework;
using Ninject;
using ConstrainedScheduleInterfaces;

namespace ConstrainedSchedule.Testing
{
    internal static class Configuration
    {
      ...........
    }
}

I added the reference to the ConstrainedSchedule project, but the using ConstrainedScheduleInterfaces; is marked red as not found. Both the project has destination framework set .NET Framework 4.5 Any help? Thanks

Answer 1

Does the project contain a reference to the other project? You can't just add the namespace, the project itself needs an assembly reference to the other project which has that namespace.

In Visual Studio, open the Solution Explorer. Right-click on the ConstrainedSchedule project and select something along the lines of "Add Reference." In the dialog, select project references (depending on the version of Visual Studio it may be a tab or some other interface indicating projects as part of the solution). Select the ConstrainedScheduleInterfaces project and add the reference.

More information here.

Answer 2

For other people who have this problem, who have already added the reference to the dll and have made sure you have the right namespace at the top, I've found another thing that can cause this.

Select-click the file in visual studio and choose properties. In the Advanced part of properties, look for Build Action. Change it to compile if it's not already on that, and try to build again.