using System;

using System.Collections.Generic;

using System.Linq;

​

public class Program

{

    Program(){

​

​

    }

    public static void Main()

    {

        //Console.WriteLine("Hello World");

        //searchName="Name1";

Dictionary<int, string> _namePositionDictionary = new Dictionary<int, string>();

​

_namePositionDictionary.Add(1, "Name1");

_namePositionDictionary.Add(2, "Name2");

_namePositionDictionary.Add(4, "Name4");

_namePositionDictionary.Add(3, "Name4");

        var nameIndex=0;

  var searchName = "Name1";

  var index = (from a in _namePositionDictionary where a.Value == searchName select a.Key).FirstOrDefault();

        Console.WriteLine(index);

  if (index != 0)

  {

      var maxValue=_namePositionDictionary.Keys.Max();

      Console.WriteLine("Max Key Value:"+maxValue);

      var last = _namePositionDictionary.Keys.Last();

      var val1=maxValue+1;

      Console.WriteLine(val1);

     _namePositionDictionary.Add(val1, searchName );

  }

  else

  {

      var maxValue=_namePositionDictionary.Keys.Max();

      Console.WriteLine("Max Key Value:"+maxValue);

      var last = _namePositionDictionary.Keys.Last();

      var val1=maxValue+1;

      Console.WriteLine(val1);

     _namePositionDictionary.Add(val1, searchName );

  }

​

try

{

   // _namePositionDictionary.Add("5", "winword.exe");

}

catch (ArgumentException)

{

    Console.WriteLine("An element with Key = \"txt\" already exists.");

}

​

foreach (KeyValuePair<int, string> kvp in _namePositionDictionary)

{

    //textBox3.Text += ("Key = {0}, Value = {1}", kvp.Key, kvp.Value);

    Console.WriteLine(string.Format("Key = {0}, Value = {1}", kvp.Key, kvp.Value));

}

    }

​

​

}