C# | How to copy a String into another String

Last Updated : 01 Feb, 2019

String.Copy(String) Method is used to create a new instance of String with the same value as a specified String. In other words, this method is used to copy the data of one string into a new string.
The new string contains same data like an original string but represents a different object reference.

Syntax:

public static string Copy (string value);

Parameter: Here value is the string which is to be copied.

Return Value: The return type of this method is System.String. This method returns a new string that contains the data similar to the value.

Exception: This method will give ArgumentNullException if the value is null.

Below given are some examples to understand the implementation in a better way:

Example 1:

// C# program to illustrate Copy() Method
using System;
   
class GFG {
   
    // Main Method
    static public void Main()
    {
   
        // string which is to be copied
        string strA = "GeeksforGeeks";
   
        // Copy the data of strA string
        // into strB string
        // using Copy() method
        string strB = String.Copy(strA);
          
        Console.WriteLine("Original String strA: {0}", strA);
        Console.WriteLine("Copied String strB: {0}", strB);
    }
}

Output:

Original String strA: GeeksforGeeks
Copied String strB: GeeksforGeeks

Example 2:

// C# program to check reference of strings
using System;
  
class GFG {
      
    // Main Method
    static public void Main()
    {
  
        // string
        string strA = "GeeksforGeeks";
        string strB = "C# Tutorials";
        Console.WriteLine("Original string A: {0}", strA);
        Console.WriteLine("Original string B: {0}", strB);
        Console.WriteLine();
  
        Console.WriteLine("After copy:");
  
        // copy the data of strA string 
        // into strB string
        // using Copy() method
        strB = String.Copy(strA);
          
        Console.WriteLine("Value of string A: {0}", strA);
        Console.WriteLine("Value of string B: {0}", strB);
  
        // Checking the reference of both string
        Console.WriteLine("Is reference of strings is equal : {0}",
                               Object.ReferenceEquals(strA, strB));
    }
}

Output:

Original string A: GeeksforGeeks
Original string B: C# Tutorials

After copy:
Value of string A: GeeksforGeeks
Value of string B: GeeksforGeeks
Is reference of strings is equal : False

Reference:

https://docs.microsoft.com/en-us/dotnet/api/system.string.copy?view=netframework-4.7.2#definition

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