I am working on QuickSort Console Application as i made quicksort function

public static void Main(string[] args) { ****************************************
int[] arr;
int hi, lo = 0;
getArray(arr);
Sort(lo, hi,arr);
//The problem lies here it is giving error on variable "hi" as how to determine its the last number in array. *********************************** }
public static void getArray(int [] arr)
{
try {
int i;
for (i = 0; i <= arr.Length; i++)
{
Console.WriteLine("Enter the numbers to sort:" +arr[i]);
}
} catch(Exception e)
{ Console.WriteLine("{0} Exception caught.", e);
}
displayArr(arr);
}
public static void displayArr(int [] arr)
{
for (int i = 0; i <= arr.Length; i++)
{
Console.Write("Sorted:" +arr[i]); } }

Please help me in this. Can any body try to make a small fix to it or explain
Thanks,
regards,

int hi, lo = 0;
getArray(arr);
hi = arr.Length - 1;



//www.fformula.net//

Thanks a million for reply now i am getting error on
getArray(arr); // its giving error "Use of unassigned local variable arr"

Any solution for that?

Thanks,
Regards

This has been sorted out. Thanks