静态方法无法访问实例字段

我读过很多关于静态字段的文章

静态方法无法访问实例字段字段，因为实例字段仅存在于该类型的实例上。

但是我们可以在静态类中创建和访问实例字段。

请在下面找到代码，

class Program
{
    static void Main(string[] args)
    {
      
    }
}
class clsA
{
    
    int a = 1;
    // Static methods have no way of accessing fields that are instance fields, 
    // as instance fields only exist on instances of the type.
    public static void Method1Static()
    {
        // Here we can create and also access instance fields
        // which we have declared inside the static method
        int b = 1;
        // a = 2; We get an error when we try to access instance variable outside the static method
        // An object reference is required for the non-static field, method, or property
        
        Program pgm = new Program();
        // Here we can create and also access instance fields by creating the instance of the concrete class
        clsA obj = new clsA();
        obj.a = 1;
    }
}

这是真的"我们可以访问静态方法中的非静态字段"吗？

另一个问题如果我们将类clsA声明为静态类，即使在那时，如果我们在静态方法中声明实例字段，我们也不会收到任何编译错误？

我哪里错了？