C# | ArrayList.InsertRange() Method
Last Updated :
11 Jul, 2025
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ArrayList.InsertRange(Int32, ICollection) Method in C# is used to insert the elements from a collection into the ArrayList at a specified index. That is the inserted element belongs to a collection(i.e. queue etc).
Syntax:
csharp
csharp
public virtual void InsertRange (int index, ICollection element);Parameters:
- index: It is the index, where the new elements to be inserted.
- element: It is the ICollection whose elements are going to be inserted into the ArrayList at a specified index.
- ArgumentNullException: If the element is null.
- ArgumentOutOfRangeException: If the index is less than zero or index is greater than counter.
- NotSupportedException: If the ArrayList is read-only or the ArrayList has a fixed size.
// C# program to demonstrate the
// ArrayList.InsertRange(Int32,
// ICollection) Method
using System;
using System.Collections;
class GFG {
// Main Method
public static void Main()
{
// initializes a new ArrayList
ArrayList ArrList = new ArrayList();
// adding values in the
// ArrayList using "Add"
ArrList.Add("A");
ArrList.Add("D");
ArrList.Add("E");
ArrList.Add("F");
// initializes a new Stack
// as collection
Stack s = new Stack();
// pushing values in the stack
// values are pop as B, C
s.Push("C");
s.Push("B");
// Displays the ArrayList and the Queue
Console.WriteLine("The ArrayList initially has:");
Display(ArrList);
Console.WriteLine("The collection initially has:");
Display(s);
// Copies the elements of the stack
// to the ArrayList at index 1.
ArrList.InsertRange(1, s);
// Displays the ArrayList.
Console.WriteLine("After insert the collection in the ArrList:");
Display(ArrList);
}
// Display function
public static void Display(IEnumerable ArrList)
{
foreach(Object a in ArrList)
{
Console.Write(" " + a);
}
Console.WriteLine();
}
}
// C# program to demonstrate the // ArrayList.InsertRange(Int32, // ICollection) Methodusing System;using System.Collections;class GFG { // Main Method public static void Main() { // initializes a new ArrayList ArrayList ArrList = new ArrayList(); // adding values in the // ArrayList using "Add" ArrList.Add("A"); ArrList.Add("D"); ArrList.Add("E"); ArrList.Add("F"); // initializes a new Stack // as collection Stack s = new Stack(); // pushing values in the stack // values are pop as B, C s.Push("C"); s.Push("B"); // Displays the ArrayList and the Queue Console.WriteLine("The ArrayList initially has:"); Display(ArrList); Console.WriteLine("The collection initially has:"); Display(s); // Copies the elements of the stack // to the ArrayList at index 1. ArrList.InsertRange(1, s); // Displays the ArrayList. Console.WriteLine("After insert the collection in the ArrList:"); Display(ArrList); } // Display function public static void Display(IEnumerable ArrList) { foreach(Object a in ArrList) { Console.Write(" " + a); } Console.WriteLine(); }}
Output:
Example 2:+
The ArrayList initially has: A D E F The collection initially has: B C After insert the collection in the ArrList: A B C D E F
// C# program to demonstrate the
// ArrayList.InsertRange(Int32,
// ICollection) Method
using System;
using System.Collections;
class GFG {
// Main Method
public static void Main()
{
// initializes a new ArrayList
ArrayList ArrList = new ArrayList();
// adding values in the ArrayList
// using "Insert" method
ArrList.Insert(0, "A");
ArrList.Insert(1, "D");
ArrList.Insert(2, "E");
ArrList.Insert(3, "G");
// Initializes a new Stack
// as collection
Stack s = new Stack();
// pushing values in the stack
// values are pop as B, C
s.Push("C");
s.Push("B");
// Displays the ArrayList and the Queue.
Console.WriteLine("The ArrayList initially has:");
Display(ArrList);
Console.WriteLine("The collection initially has:");
Display(s);
// Copies the elements of the stack
// to the ArrayList at index 1.
ArrList.InsertRange(1, s);
// Displays the ArrayList.
Console.WriteLine("After insert the collection in the ArrList:");
Display(ArrList);
// insert F by finding the index of G
// using IndexOf() method
ArrList.Insert(ArrList.IndexOf("G"), "F");
Console.WriteLine("After inserting F before G:");
Display(ArrList);
}
// Display function
public static void Display(IEnumerable ArrList)
{
foreach(Object a in ArrList)
{
Console.Write(" " + a);
}
Console.WriteLine();
}
}
// C# program to demonstrate the // ArrayList.InsertRange(Int32, // ICollection) Methodusing System;using System.Collections;class GFG { // Main Method public static void Main() { // initializes a new ArrayList ArrayList ArrList = new ArrayList(); // adding values in the ArrayList // using "Insert" method ArrList.Insert(0, "A"); ArrList.Insert(1, "D"); ArrList.Insert(2, "E"); ArrList.Insert(3, "G"); // Initializes a new Stack // as collection Stack s = new Stack(); // pushing values in the stack // values are pop as B, C s.Push("C"); s.Push("B"); // Displays the ArrayList and the Queue. Console.WriteLine("The ArrayList initially has:"); Display(ArrList); Console.WriteLine("The collection initially has:"); Display(s); // Copies the elements of the stack // to the ArrayList at index 1. ArrList.InsertRange(1, s); // Displays the ArrayList. Console.WriteLine("After insert the collection in the ArrList:"); Display(ArrList); // insert F by finding the index of G // using IndexOf() method ArrList.Insert(ArrList.IndexOf("G"), "F"); Console.WriteLine("After inserting F before G:"); Display(ArrList); } // Display function public static void Display(IEnumerable ArrList) { foreach(Object a in ArrList) { Console.Write(" " + a); } Console.WriteLine(); }}
Output:
Reference:
The ArrayList initially has: A D E G The collection initially has: B C After insert the collection in the ArrList: A B C D E G After inserting F before G: A B C D E F G
