Linq Append Method

Linq Append Method in C# with Example

In this article, I am going to discuss the LINQ Append Method with an example. Please read our previous article before proceeding to this article where we discussed the LINQ Empty Method with some examples.

Append Method:

The LINQ Append Method is used to append a value to the end of the sequence. This Append method does not modify the elements of the sequence. Instead, it creates a copy of the sequence with the new element. Following is the signature of the Append method.

Linq Append Method in C# with Example

Type Parameters

  1. TSource: The data type of the elements contained in the sequence.


  1. IEnumerable<TSource> source: A sequence of values.
  2. TSource element: The value to append at the end of the sequence.


  1. IEnumerable<TSource>: A new sequence that ends with the element.

Exceptions: When the source is null, it will throw ArgumentNullException.

Note: This method is support from Framework 4.7.1 or later.


The following example shows how to use the Append Method to append a value to the end of the sequence. The following example is self-explained. So, please go through the comment lines.

using System.Linq;
using System.Collections.Generic;
using System;
namespace LinqDemo
    class Program
        static void Main(string[] args)
            // Creating a list of integer
            List<int> intSequence = new List<int> { 10, 20, 30, 40 };

            // Trying to append 50 at the end of the intSequence

            //It doesn't work because the original list has not been changed
            Console.WriteLine(string.Join(", ", intSequence));

            // It works now because we are using a changed copy of the original sequence
            Console.WriteLine(string.Join(", ", intSequence.Append(5)));

            // Creating a new sequence explicitly
            List<int> newintSequence = intSequence.Append(5).ToList();

            // Printing the new sequence in the console
            Console.WriteLine(string.Join(", ", newintSequence));



Linq Append Method in C# with Example

In the next article, I am going to discuss the Linq Prepend Method with examples. Here, in this article, I try to explain the Append method with an example.

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