Cannot declare instance members in a static class

Cannot declare instance members in a static class

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!

 

Cannot declare instance members in a static class - Article on SQLNetHub

 

 

 

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Reference: SQLNetHub (https://www.sqlnethub.com)

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Artemakis Artemiou
Artemakis Artemiou is a Senior SQL Server and Software Architect, Author, and a 9 Times Microsoft Data Platform MVP (2009-2018). He has over 15 years of experience in the IT industry in various roles. Artemakis is the founder of SQLNetHub and TechHowTos.com. Artemakis is the creator of the well-known software tools Snippets Generator and DBA Security Advisor. Also, he is the author of many eBooks on SQL Server. Artemakis currently serves as the President of the Cyprus .NET User Group (CDNUG) and the International .NET Association Country Leader for Cyprus (INETA). Artemakis's official website can be found at aartemiou.com.