Hashtable problem c#

I have a hashtable with A lot of words , when i introduce the words manually into the hashtable*[hashtable.add(id,"name")]it works perfectly with [hashtable.ContainsValue(InputField)]*, but somehow, when I introduce data in the hastable via automation, like

     int i = 0;
     foreach (string s in LinesDiccionaryD)
     {
         Tabla.Add(i, s.ToLower());
         i++;
     }
     foreach (string s in LinesDiccionaryS)
     {
         Tabla.Add(i, s.ToLower());
         i++;
     }

it just stop working with [hashtable.ContainsValue(InputField)], how can i solve that, sorry for my english , and thx btw, I hope someone can help me

 using System.Collections;
 using System.Collections.Generic;
 using System.IO;
 using System.Linq;
 using UnityEngine;
 using UnityEngine.UI;
 using UnityEditor;
 
 
 public class DiccionaryReader : MonoBehaviour
 {
     private string LastLine;
     private string line;
     public int currentLine = 0;
     public int CurrentLine3;
     public int CurrentLine4;
 
     Hashtable Tabla;
 
     private string[] lines;
     private string[] LinesDiccionaryS;
     public string[] LinesDiccionaryD;
     private string content;
     private string contentDiccionaryS;
     private string contentDiccionaryD;
     private string[] tokens;
     public Text Palabra;
     public Text Conjugacion;
     public Text Tipo;
     public Text Traduccion;
 
     public bool SearchingForWord;
 
     public bool UpdatingDiccionaries;
     public bool UpdatingDiccionaryD;
     public bool UpdatingDiccionaryS;
 
     public InputField SearchWord;
 
     public TextAsset file;
     public TextAsset FileDiccionaryS;
     public TextAsset FileDiccionaryD;
 
     public void Start()
     {
         FileDiccionaryD = Resources.Load("Info/DiccionaryD") as TextAsset;
         FileDiccionaryS = Resources.Load("Info/DiccionaryS") as TextAsset;
         file = Resources.Load("Info/Diccionary") as TextAsset;
 
         content = file.text;
         contentDiccionaryD = FileDiccionaryD.text;
         contentDiccionaryS = FileDiccionaryS.text;
 
         lines = content.Split('\n');
         LinesDiccionaryD = contentDiccionaryD.Split('\n');
         LinesDiccionaryS = contentDiccionaryS.Split('\n');
 
         Tabla = new Hashtable();
         NewWord();
 
         int i = 0;
         foreach (string s in LinesDiccionaryD)
         {
             Tabla.Add(i, s.ToLower());
             i++;
         }
         foreach (string s in LinesDiccionaryS)
         {
             Tabla.Add(i, s.ToLower());
             i++;
         }
         foreach (var key in Tabla.Keys)
         {
             Debug.LogWarningFormat("{0}: {1}", key, Tabla[key]);
         }
     }
 
     public void NewWord()
     {
         {
             var r = new System.Random();
             int randomNumber = r.Next(0, lines.Length);
 
             // Read the random line
             line = lines.Skip(randomNumber - 1).Take(1).First();
 
             string Output = line;
             LastLine = line;
 
             string MainString = Output;
             tokens = MainString.Split('&');
 
             Palabra.text = tokens[0];
             Tipo.text = tokens[1];
             Conjugacion.text = tokens[2];
             Traduccion.text = tokens[3];
         }
     }
 
     public void Update()
     {
         if (Tipo.text == "V")
         {
             Tipo.text = "Verbo";
         }
         else if (Tipo.text == "S")
         {
             Tipo.text = "Sustantivo";
         }
         else if (Tipo.text == "O")
         {
             Tipo.text = "Oracion";
         }
         else if (Tipo.text == "A")
         {
             Tipo.text = "Otro";
         }
     }
 
     public void SearchForWord()
     {
         Debug.Log(Tabla.Count);
         Debug.Log(SearchWord.text);
 
         if (Tabla.ContainsValue("ab"))
         {
             Debug.Log("la encontre");
         }
         else if (Tabla.ContainsKey(SearchWord.text))
         {
             var key = Tabla[SearchWord.text];
             Debug.Log(key);
         }
         else
         {
             Debug.Log("Ni Fruta idea que estas buscando");
         }
     }
 }