Why Do I keep Getting An Infinite Loop? Speech Dialogue

Hi Everyone, I am trying to use the legacy textfield function to do dialogue in my 3D game. I have the npc set to Trigger, as I collide with it, but I am trying to have a Do While Loop where when I press the F key, it goes to the next text. But I assume that it is not working because the talkcount++ is in an if statement and therefore goes into an infinite loop because it cannot increment the value of talkcount unless that is called. Please help me understand how I can Fix this or if there is a better way of doing Speech Dialogue that I do not know of. Thanks for your help! SwipeFastStudios

using UnityEngine; using System.Collections; public class Player : MonoBehaviour {

 bool mousedown = false;
 bool talk  = false;
 bool next = false;
 int talkcount = 0;
 string[] talking = {"Hello, My Name is Prof. Dungbeatle", "You are now in the Realm of Adventure", "test"};
 // Use this for initialization
 void Start () {
 
 }
 
 // Update is called once per frame
 void Update () {
 
 }

 void OnMouseDown(){
     mousedown = true;
 }

 void OnTriggerEnter(Collider other){
     if (other.name == "Capsule") {
         if (mousedown == true){
         
         Destroy(other.gameObject);
         }

     }
     if (other.name == "npc") {

         talk = true;

     
     }

 }

 void OnGUI(){

     if (talk == true){
         GUI.enabled = true;

         do {
         GUI.TextField (new Rect(300,10,400,200),talking[talkcount]);
             if (Input.GetKeyDown(KeyCode.F)){
                 talkcount++;
             }
         }while ( talkcount < talking.Length);


     }


 }

}