C# | Insert an element into the ArrayList at the specified index

C# | How to insert an element in an Array?

Last Updated : 28 Aug, 2019

An array is a collection of items stored at contiguous memory locations. In this article, we will see how to insert an element in an array in C#. Let's say we have an array and we want to insert an element at a specific position in this array. Here's how to do it.

First get the element to be inserted, say x
Then get the position at which this element is to be inserted, say pos
Create a new array with the size one greater than the previous size
Copy all the elements from previous array into the new array till the position pos
Insert the element x at position pos
Insert the rest of the elements from the previous array into the new array after the pos

CSharp

// C# program to insert an 
// element in an array
using System;

public class GFG {

    // Main Method
    static public void Main()
    {

        int n = 10;
        int[] arr = new int[n];
        int i;

        // initial array of size 10
        for (i = 0; i < n; i++)
            arr[i] = i + 1;

        // print the original array
        for (i = 0; i < n; i++)
            Console.Write(arr[i] + " ");
        Console.WriteLine();

        // element to be inserted
        int x = 50;

        // position at which element 
        // is to be inserted
        int pos = 5;

        // create a new array of size n+1
        int[] newarr = new int[n + 1];

        // insert the elements from the 
        // old array into the new array
        // insert all elements till pos
        // then insert x at pos
        // then insert rest of the elements
        for (i = 0; i < n + 1; i++) {
            if (i < pos - 1)
                newarr[i] = arr[i];
            else if (i == pos - 1)
                newarr[i] = x;
            else
                newarr[i] = arr[i - 1];
        }

        // print the updated array
        for (i = 0; i < n + 1; i++)
            Console.Write(newarr[i] + " ");
        Console.WriteLine();
    }
}

Output:

1 2 3 4 5 6 7 8 9 10 
1 2 3 4 50 5 6 7 8 9 10

C# | Insert an element into the ArrayList at the specified index

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