C# String Concat with examples

To concat strings in C#, use the String.Concat() method.

Syntax

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

Above, the parameters str1 and str2 are the strings to be concatenated.

Example

using System;
public class Demo {
   public static void Main(String[] args) {
      string str1 = "Jack";
      string str2 = "Sparrow";
      Console.WriteLine("String 1 = "+str1);
      Console.WriteLine("HashCode of String 1 = "+str1.GetHashCode());
      Console.WriteLine("Does String1 begins with E? = "+str1.StartsWith("E"));
      Console.WriteLine("\nString 2 = "+str2);
      Console.WriteLine("HashCode of String 2 = "+str2.GetHashCode());
      Console.WriteLine("Does String2 begins with E? = "+str2.StartsWith("E"));
      Console.WriteLine("\nString 1 is equal to String 2? = {0}", str1.Equals(str2));
      Console.WriteLine("Concatenation Result = "+String.Concat(str1,str2));
   }
}

Output

String 1 = Jack
HashCode of String 1 = 1167841345
Does String1 begins with E? = False
String 2 = Sparrow
HashCode of String 2 = -359606417
Does String2 begins with E? = False
String 1 is equal to String 2? = False
Concatenation Result = JackSparrow

Let us now see another example wherein we will use the concat() method with only a single parameter.

Syntax

public static string Concat (params string[] arr);

Above, arr is the string array.

Example

using System;
public class Demo {
   public static void Main(string[] args) {
      string[] strArr = {"This", "is", "it", "!" };
      Console.WriteLine("String Array...");
      foreach(string s in strArr) {
         Console.WriteLine(s);
      }      
      Console.WriteLine("Concatenation = {0}",string.Concat(strArr));
      string str = string.Join("/", strArr);
      Console.WriteLine("Result (after joining) = " + str);
   }
}

Output

String Array...
This
is
it
!
Concatenation = Thisisit!
Result (after joining) = This/is/it/!