Problem in String Sorting in C#

Question

Sir plzz help me to solve this error, The below code is work fine but when i replace

 

for(i=0; i<size; i++) to

 

for(i=1; i<=size; i++) 

 

it shows exception .why? 

 

using System;

public class ArrName

{

public static void Main()

{

string min,temp;

Console.Write("Enter the no. of Application: ");

int size = Convert.ToInt32(Console.ReadLine());

int loc,i,j;

string[] arr = new string[size];

Console.WriteLine("Enter proper name of each Student: ");

for(i = 0; i<size; i++)

{

Console.Write("{0}. ",i);

arr[i] = Console.ReadLine();

}

Console.WriteLine();

Console.ReadLine();

Console.WriteLine("Name After Arrange them in Alphabetical order: ");

for(i = 0; i<size; i++)

{

min = arr[i];

loc = i;

for(j = i+1; j<size; j++)

{

if((arr[j].CompareTo(min))<0 )

{

min = arr[j];

loc = j;

}

if(loc != i)

{

temp = arr[i];

arr[i] = arr[j];

arr[j] = temp;

}

}

}

for(i = 0; i<size; i++)

{

Console.WriteLine(" {0}", arr[i]);

}

Console.ReadKey();

}

}