Concatenating integers to string in C#

This article illustrates the different techniques to concatenate integers to a string in C#.

Since the string is immutable in C#, you can’t append any characters to it. However, you can create a new instance of the string with desired characters appended to it. This post provides an overview of few available alternatives to accomplish this.

1. Using `+` operator

A simple solution to concatenate an integer to a string is using the + operator. The following sample illustrates its usage.

using System;

public class Example

{

public static void Main()

{

string s = "$";

int i = 100;

s = s + i;

Console.WriteLine(s); // $100

}

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2. Using `string.Concat()` method

The String class provides an overload of the Concat() method that accepts an object. A call to the + operator translates to the string.Concat() method, when at-least one operand is a string. You can directly invoke the string.Concat() method, as shown below:

using System;

public class Example

{

public static void Main()

{

string s = "$";

int i = 100;

s = string.Concat(s, i);

Console.WriteLine(s); // $100

}

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3. Using `string.Format()` method

You can also use the string.Format() method to insert a value into a string. The following code example demonstrates how to invoke the String.Format() method to concatenate an integer to a string.

using System;

public class Example

{

public static void Main()

{

string s = "$";

int i = 100;

s = string.Format("{0}{1}", s, i);

Console.WriteLine(s); // $100

}

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That’s all about concatenating integers to string in C#.

Concatenating integers to string in C#

1. Using + operator

2. Using string.Concat() method

3. Using string.Format() method

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1. Using `+` operator

2. Using `string.Concat()` method

3. Using `string.Format()` method