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C# | Copy the elements of collection over a range of elements in ArrayList

Last Updated : 11 Jul, 2025
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ArrayList.SetRange(Int32, ICollection) Method is used to copy the elements of a collection over a range of elements in the ArrayList. Syntax: 
public virtual void SetRange (int index, System.Collections.ICollection c);
Parameters:
index: It is a zero-based ArrayList index at which to start copying the elements of c. The type of this parameter is System.Int32. c: It is an ICollection whose elements to copy to the ArrayList. The collection itself cannot be null, but it can contain elements that are null.
Exceptions:
  • ArgumentNullException: If the value of c is null.
  • NotSupportedException: If the ArrayList is read-only.
  • ArgumentOutOfRangeException: If the index is less than zero or [index + number of elements in c] > Count.
Below given are some examples to understand the implementation in a better way: Example 1: CSharp 
// C# Program to illustrate the 
// SetRange() Method
using System;
using System.Collections;

class GFG {
    
    // Main method
    public static void Main()
    {
        
        // Create and initialize ArrayList
        ArrayList mylist = new ArrayList();
        mylist.Add("G");
        mylist.Add("e");
        mylist.Add("e");
        mylist.Add("k");
        mylist.Add("s");
        mylist.Add("G");
        mylist.Add("F");
        mylist.Add("G");

        // There are total 4 elements
        string[] str = { "This", "is", "C#", "Tutorial" };
        
        // using SetRange() Method
        // starting from index 0
        mylist.SetRange(0, str);

        Show("ArrayList is", mylist);
    }
    
    // show method to display the result
    static void Show(string arr, ArrayList mylist)
    {
        for (int j = 0; j < mylist.Count; j++) {
            
            Console.WriteLine(arr + "[" + j + "] = " + mylist[j]);
        }
    }
}
Output: 
ArrayList is[0] = This
ArrayList is[1] = is
ArrayList is[2] = C#
ArrayList is[3] = Tutorial
ArrayList is[4] = s
ArrayList is[5] = G
ArrayList is[6] = F
ArrayList is[7] = G
Example 2: CSharp 
// C# Program to illustrate the 
// SetRange() Method
using System;
using System.Collections;

class GFG {
    // Main method
    public static void Main()
    {
        // Create and initialize ArrayList
        ArrayList mylist1 = new ArrayList();
        mylist1.Add("Hello ");
        mylist1.Add("Welcome ");
        mylist1.Add("to ");
        mylist1.Add("online ");
        mylist1.Add("portal ");
        mylist1.Add("of ");
        mylist1.Add("Geeks ");
        mylist1.Add("for ");
        mylist1.Add("Geeks ");

        // Create and initialize new ArrayList
        ArrayList mylist2 = new ArrayList();
        mylist2.Add("This ");
        mylist2.Add("is ");
        mylist2.Add("C# ");
        mylist2.Add("tutorial");
        mylist2.Add(".");

        // Displays the values of 6 
        // elements of mylist1 starting
        // at index 0.
        ArrayList result = mylist1.GetRange(0, 6);
        
        Console.WriteLine("String from index number 0 to 6:");
        {
            foreach(Object obj in result)
                Console.Write("{0}", obj);
            Console.WriteLine();
        }

        // Replace the value of 5 element
        // starting from index 1
        // with the values in mylist2
        mylist1.SetRange(1, mylist2);

        // Display the result
        result = mylist1.GetRange(0, 6);
        Console.WriteLine("After SetRange() Method:");
        {
            foreach(Object obj in result)
                Console.Write("{0}", obj);
            Console.WriteLine();
        }
    }
}
Output: 
String from index number 0 to 6:
Hello Welcome to online portal of 
After SetRange() Method:
Hello This is C# tutorial.
Reference:

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