How to access the top-level statement variable in a class in C#?

I have a simple code below. I want to access the variable x in the class Program. As x is a global variable, I should be able to access it, Is there a way to access the top-level variable apart from the top level?

int x = 0;

namespace ConsoleApp1
{
    internal class Program
    {

        public void TestMethod()
        {
            int y = x;
        }
    }
}

Error message:

CS8801 Cannot use local variable or local function ‘x’ declared in a
top-level statement in this context

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Is the below only allowed? I mean to access at the top level only?

int x = 0;
int z = x; //no compilation error?

Edit: int y = global::x; also gives compilation error

>Solution :

Is the below only allowed? I mean to access at the top level only?

Yes, top-level statements actually generate a method and all declared variables are local to it. I.e. your code will be translated to something like the following (@sharplab, also note that actual generated class/method names can depend on the framework version, cause in .NET 6 the generational pattern changed to support unit tests in minimal hosting model):

[CompilerGenerated]
internal class Program
{
    private static void <Main>$(string[] args)
    {
        int num = 0;
    }
}

namespace ConsoleApp1
{
    internal class Program
    {
        public void TestMethod()
        {
        }
    }
}

More info about the generation patterns can be found in the docs.