Insert node at specific position..

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insert Code Snippet

    static SinglyLinkedListNode insertNodeAtPosition(SinglyLinkedListNode llist, int data, int position)
    {
        var temp = llist;
        var i=0;
        while(i < position-1)
        {
            temp=temp.next;
            i++;
        }
        var prev = temp.next;
        temp.next= new SinglyLinkedListNode(data);
        temp.next.next=prev;
        return llist;
    }

Full Code Snippets

Since there is no any instance of Result class created inside Main method so,

I have removed class result and make insertNodeAtPosition method not public

using System;
using System.Collections.Generic;
using System.IO;
using System.Linq;
class Solution {

    class SinglyLinkedListNode {
        public int data;
        public SinglyLinkedListNode next;

        public SinglyLinkedListNode(int nodeData) {
            this.data = nodeData;
            this.next = null;
        }
    }

    class SinglyLinkedList {
        public SinglyLinkedListNode head;
        public SinglyLinkedListNode tail;

        public SinglyLinkedList() {
            this.head = null;
            this.tail = null;
        }

        public void InsertNode(int nodeData) {
            SinglyLinkedListNode node = new SinglyLinkedListNode(nodeData);

            if (this.head == null) {
                this.head = node;
            } else {
                this.tail.next = node;
            }
            
            this.tail = node;
        }
    }

    static void PrintSinglyLinkedList(SinglyLinkedListNode node, string sep, TextWriter textWriter) {
        while (node != null) {
            textWriter.Write(node.data);

            node = node.next;

            if (node != null) {
                textWriter.Write(sep);
            }
        }
    }
    static SinglyLinkedListNode insertNodeAtPosition(SinglyLinkedListNode llist, int data, int position)
    {
        var temp = llist;
        var i=0;
        while(i < position-1)
        {
            temp=temp.next;
            i++;
        }
        var prev = temp.next;
        temp.next= new SinglyLinkedListNode(data);
        temp.next.next=prev;
        return llist;
    }

    static void Main(string[] args) {
        TextWriter textWriter = new StreamWriter(@System.Environment.GetEnvironmentVariable("OUTPUT_PATH"), true);

        SinglyLinkedList llist = new SinglyLinkedList();

        int llistCount = Convert.ToInt32(Console.ReadLine());

        for (int i = 0; i < llistCount; i++) {
            int llistItem = Convert.ToInt32(Console.ReadLine());
            llist.InsertNode(llistItem);
        }

        int data = Convert.ToInt32(Console.ReadLine());

        int position = Convert.ToInt32(Console.ReadLine());

        SinglyLinkedListNode llist_head = insertNodeAtPosition(llist.head, data, position);

        PrintSinglyLinkedList(llist_head, " ", textWriter);
        textWriter.WriteLine();

        textWriter.Flush();
        textWriter.Close();
    }
}