public static SinglyLinkedListNode? deleteNode(SinglyLinkedListNode? llist, int position) { if(llist == null) { return null; }

    if(position == 0)
    {
        return llist.next;
    }

    int currentPosition =0;
    SinglyLinkedListNode? current = llist;
    while( current !=null && current.next != null && currentPosition < position-1)
    {
        current = current.next;
        currentPosition++;
    }

    if (current == null || current.next == null)
    {
       return llist;
    }        

    current.next = current.next.next;       
    return llist;     
}

it show: error CS0103: The name 'deleteNode' does not exist in the current context....