Cannot declare instance members in a static class

This short post examines the error message “Cannot declare instance members in a static class” when developing in C# in Visual Studio.

This article provides useful information such as how you can reproduce the error message in order to better understand its root cause, as well as how you can resolve the issue.

Reproducing the Error

Consider the below example:

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace Test
{

    static class testClass
    {
        string sampleString = "Hello World!";
    }
}

If you try to compile the above code, you will get the error message:

CS0708 ‘testClass.sampleString’: cannot declare instance members in a static class

 

How to Resolve the Issue

If you see this error message, don’t worry. The solution is very simple.

You just need to specify as static the string declaration within the class. So, the correct code for this example would be the below:

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace Test
{

    static class testClass
    {
        static string sampleString = "Hello World!";
    }
}

So, you just compile and that’s it! No errors!

 

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