Changing Text of multiple Button if Pressed Button Text is equal to UI Text

I write that code Butt it is not working plz help me ... i am new developer on unity

using UnityEngine; using System.Collections; using UnityEngine.UI; using System;

public class Guess : MonoBehaviour { public Text mainText; public Button b1; public Button b2; public Button b3; public Button b4; public Button b5; public Button b6; public Button b7; public Button b8;

 String[] array; 
 void Start () {

     mainText = mainText.GetComponent<Text>();
     b1 = b1.GetComponent<Button>();
     b2 = b1.GetComponent<Button>();
     b3 = b1.GetComponent<Button>();
     b4 = b1.GetComponent<Button>();
     b5 = b1.GetComponent<Button>();
     b6 = b1.GetComponent<Button>();
     b7 = b1.GetComponent<Button>();
     b8 = b1.GetComponent<Button>();



     array = new string[8];
     array[0] = "Pakistan";
     array[1] = "India";
     array[2] = "Amarica";
     array[3] = "England";
     array[4] = "Room";
     array[5] = "Itly";
     array[6] = "Turky";
     array[7] = "Rausia";

    
     System.Random rn = new System.Random();
     int answer = rn.Next(8 ) + 1;
     mainText.text = array[answer];




 }
 
 // Update is called once per frame
 void Update () {


 }

 public void buttonRight1()
 {
     
    // String s = mainText.text;
     /*
     //suffle(s);
     if (b1.GetComponentInChildren<Text>().text == s)
     {
         check();

     }
     */
     if (b1.GetComponentInChildren<Text>().text == mainText.text)
     {
         
         b1.GetComponentInChildren<Text>().text = randomName();
         check();

     }


 }
 public void buttonRight2()
 {
     //String s = mainText.text;
     if (b2.GetComponentInChildren<Text>().text == mainText.text)
     {
         //b2.GetComponentInChildren<Text>().text = randomName();
         
         b2.GetComponentInChildren<Text>().text = randomName();
         check();
     }



 }
 public void buttonRight3()
 {
    // String s = mainText.text;
     if (b3.GetComponentInChildren<Text>().text == mainText.text)
     {
         b3.GetComponentInChildren<Text>().text = randomName();
         check();
     }

 }
 public void buttonRight4()
 {
    // String s = mainText.text;
     if (b4.GetComponentInChildren<Text>().text == mainText.text)
     {
         b4.GetComponentInChildren<Text>().text = randomName();
         check();
     }
 }


 public void buttonLeft1()
 {
     //String s = mainText.text;
     if (b5.GetComponentInChildren<Text>().text == mainText.text)
     {
         b5.GetComponentInChildren<Text>().text = randomName();
         check();
     }
 }
 public void buttonLeft2()
 {
    // String s = mainText.text;
     if (b6.GetComponentInChildren<Text>().text == mainText.text)
     {
         b6.GetComponentInChildren<Text>().text = randomName();
        check();
     }
 }
 public void buttonLeft3()
 {
     //String s = mainText.text;
     if (b7.GetComponentInChildren<Text>().text == mainText.text)
     {
         b7.GetComponentInChildren<Text>().text = randomName();
         check();
     }
 }
 public void buttonLeft4()
 {
    // String s = mainText.text;
     if (b8.GetComponentInChildren<Text>().text == mainText.text)
     {
         b8.GetComponentInChildren<Text>().text = randomName();
         check();
     }
 }
 /*
 public void suffle( String s )
 {
    
     if (b1.GetComponentInChildren<Text>().text == s)
     {
         check();
     }
     else if (b2.GetComponentInChildren<Text>().text == s)
     {
         check();
     }
     else if (b3.GetComponentInChildren<Text>().text == s)
     {
         check();
     }
     else if (b4.GetComponentInChildren<Text>().text == s)
     {
         check();
     }
     else if (b5.GetComponentInChildren<Text>().text == s)
     {
         check();
     }
     else if (b6.GetComponentInChildren<Text>().text == s )
     {
         check();
     }
     else if (b7.GetComponentInChildren<Text>().text == s)
     {
         check();
     }
     else if (b8.GetComponentInChildren<Text>().text == s)
     {
         check();
     }
 }
 */
 
 public String randomName()
 {
     
     array[0] = "Pakistan";
     array[1] = "India";
     array[2] = "Amarica";
     array[3] = "England";
     array[4] = "Room";
     array[5] = "Itly";
     array[6] = "Turky";
     array[7] = "Rausia";


     System.Random rn = new System.Random();
     int answer = rn.Next(8 ) + 1;
     return array[answer];
 }

 public void check()
 {
     
     
     while (b1.GetComponentInChildren<Text>().text == b2.GetComponentInChildren<Text>().text
            /* &&
             b2.GetComponentInChildren<Text>().text == b3.GetComponentInChildren<Text>().text
             &&
             b3.GetComponentInChildren<Text>().text == b4.GetComponentInChildren<Text>().text
             &&
             b4.GetComponentInChildren<Text>().text == b5.GetComponentInChildren<Text>().text
             &&
             b5.GetComponentInChildren<Text>().text == b6.GetComponentInChildren<Text>().text
             &&
             b6.GetComponentInChildren<Text>().text == b7.GetComponentInChildren<Text>().text
             &&
             b7.GetComponentInChildren<Text>().text == b8.GetComponentInChildren<Text>().text
             &&
             b8.GetComponentInChildren<Text>().text == b1.GetComponentInChildren<Text>().text

 */
         )
     {
         
         b1.GetComponentInChildren<Text>().text = randomName();
         b2.GetComponentInChildren<Text>().text = randomName();
         b3.GetComponentInChildren<Text>().text = randomName();
         b4.GetComponentInChildren<Text>().text = randomName();
         b5.GetComponentInChildren<Text>().text = randomName();
         b6.GetComponentInChildren<Text>().text = randomName();
         b7.GetComponentInChildren<Text>().text = randomName();
         b8.GetComponentInChildren<Text>().text = randomName();

     }
 }
 

}