C# String - Concat() Method

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The C# String Concat() method is used to concatenate or merge two or more strings into a single string. It supports concatenation of the arrays and other objects.

Syntax

Following are the syntax of the C# string Concat() method −

Basic Concatenation:

public static string Concat(string? str1, string? str2);

Concatenating Three Strings:

public static string Concat(string? str1, string? str2, string? str3);

Concatenating Multiple Strings:

public static string Concat(params string?[] values);

Concatenating Objects:

public static string Concat(params object?[] args);

Parameters

This method accepts more than one string, object, and array to concatenate.

Return value

This method returns a string, which is the concatenation of the multiple strings.

Example 1: Concatenate Two Strings

This is the basic example of the string Concat() method. Here, we concatenate two strings into a single string.

    
using System;
class Program {
   static void Main() {
      string str1 = "abcdef";
      string str2 = "abcxyz";
      
      // concatenate two strings
      string result = String.Concat(str1, str2); 

      Console.WriteLine("concatenated: " + result);
   }
}

Output

Following is the output −

concatenated: abcdefabcxyz

Example 2: Concatenate Three Strings

Let us see another example of the Concat() method. Here, we use this method to concatenate three strings into a single string −

using System;
class Program {
   static void Main() {
      string str1 = "abcdef";
      string str2 = " abcxyz";
      string str3 = "Aman ";
      
      // concatenate three strings
      string result = String.Concat(str3, str1, str2); 

      Console.WriteLine("concatenated: " + result);
   }
}

Output

Following is the output −

Example 3: Concatenate The Objects

In the following example, we use the Concat() method to concatenate more than two objects, all objects are different types. −

using System;
class Program {
   static void Main() {
      int number = 42;
      double pi = 3.14;
      string text = "The answer is ";

      string result = String.Concat(text, number, " and pi is approximately ", pi);

      Console.WriteLine(result);
   }
}

Output

Following is the output −

The answer is 42 and pi is approximately 3.14

Example 4: Concatenate an Array's elements

Here, in this example, we use another version of the Concat() method to concatenate the string array −

using System;
class Program {
   static void Main() {
      string[] words = { "This ", "is ", "a ", "tutorialspoint." };
      string result = String.Concat(words);

      Console.WriteLine(result);
   }
}

Output

Following is the output −

This is a tutorialspoint.