Assigning tag on runtime break loop in C# unity3D 4.3.

Hi, I am working on 2D game in unity 4.3. I have a single red and blue ball and I want to create their clones on runtime and adding into different array with different tag but what happen when I try to assign tag then its break loop and just run code on above of assigning tag code. Below is my code to create 5 5 red and blue balls.

     int i =0;
     int tag=1;
     float differenceX = 0.25f;
     float differenceY = 0.25f;
     while(i<5){

         Vector3 position = new Vector3(blueBall.transform.position.x+differenceX,blueBall.transform.position.y,blueBall.transform.position.z);
         GameObject redBall1 = Instantiate(redBall,position,Quaternion.identity) as GameObject;
         tag = tag+i;
         redBall1.gameObject.tag = "RedBall"+tag;

         Vector3 positionBlue = new Vector3(blueBall.transform.position.x+differenceX,blueBall.transform.position.y-differenceY,blueBall.transform.position.z);
         GameObject blueBall1 = Instantiate(blueBall,positionBlue,Quaternion.identity) as GameObject;
         blueBall1.gameObject.tag = "BlueBall"+tag;
         redBallsArray[i] = redBall1;
         blueBallsArray[i] = blueBall1;

         differenceX =differenceX+0.25f;
         i++;
     }

Code break from "redBall1.gameObject.tag = "RedBall"+tag;" and not execute code after that and when I block this line then it works fine and create all ball otherwise its just show only only one ball. I also tried with "blueBall1.transform.tag" and "blueBall1.tag". Kindly tell me any other approach to assigning tag or other technique to store each object with different identity in array. Thanks in advance.