Member '' cannot be accessed with an instance reference

Question

I am getting into C# and I am having this issue:

namespace MyDataLayer
{
    namespace Section1
    {
        public class MyClass
        {
            publ         


        

Answer 1

cannot be accessed with an instance reference

It means you're calling a STATIC method and passing it an instance. The easiest solution is to remove Static, eg:

public static void ExportToExcel(IEnumerable data, string sheetName) {