C# String Concat()

using System;  
namespace CsharpString {  
  class Test {
    public static void Main(string [] args) {
     
      string str0 = "Ice";
      string str1 = " cream";
     
      // concatenates str0 and str1
      string result = String.Concat(str0 + str1);
      Console.WriteLine(result);   

      Console.ReadLine();    
    }
  } 
}

// Output: Ice cream

Concat() Syntax

The syntax of the String Concat() method is:

String.Concat(string str0, string str1)

Here, Concat() is a method of class String.

Concat() Parameters

The Concat() method takes the following parameters:

• str0 - first string to concatenate
• str1 - second string to concatenate

Concat() Return Value

The Concat() method returns:

• a string which is the concatenation of str0 and str1

Example 1: C# String Concat()

using System;  
namespace CsharpString {  
  class Test {
    public static void Main(string [] args) {
     
      string str0 ="ice";
      string str1 = "cream";
      string result;
     
      // concatenates str0 and str1
      result = String.Concat(str0, str1);
      Console.WriteLine(result); 

      // concatenates str0 and str1
      result = String.Concat(str1, str0);
      Console.WriteLine(result);   

      Console.ReadLine();    
    }
  } 
}

Output

icecream
creamice

In the above example,

• String.Concat(str0, str1); joins str1 to the end of str0
• String.Concat(str1, str0); joins str0 to the end of str1

Example 2: Concat() - Concatenate Three Strings

using System;  
namespace CsharpString {  
  class Test {
    public static void Main(string [] args) {
     
      string str0 = "Everyone";
      string str1 = " loves";
      string str2 = " ice cream";
     
      // concatenates str0, str1, and str2
      string result = String.Concat(str0, str1, str2);
      Console.WriteLine(result);   

      Console.ReadLine();    
    }
  } 
}

Output

Everyone loves ice cream

In the above example, the Concat() method joins three strings.

Example 3: Concat() - Array Elements

using System;  
namespace CsharpString {  
  class Test {
    public static void Main(string [] args) {
     
      string[] str = {"Chocolate", " Ice cream", " Vanilla"};
     
      // concatenates string array
      string result = String.Concat(str);
      Console.WriteLine(result);   

      Console.ReadLine();    
    }
  } 
}

Output

Chocolate Ice cream Vanilla

In the above example, the Concat() method joins the elements in array str.