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C# / .NET - replace last 4 characters in string

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Created by:

Marcino

720

In this article, we would like to show you how to replace the last 4 characters in a string in C#.

Quick solution:

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string originalString = "abcdefg";
​
string replaced = originalString.Substring(0, originalString.Length - 4) + "1234";
​
Console.WriteLine(originalString); // abcdefg
Console.WriteLine(replaced);       // abc1234

Practical examples

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1. Using `Substring()` method

Edit

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using System;
​
public class Program
{
    static string ReplaceLastLetters(string text, int letterCount, string newLetters)
    {
        string substring = text.Substring(0, text.Length - letterCount); // abcdefg -> abc
        return substring + newLetters;
    }
​
    public static void Main(string[] args)
    {
        string originalString = "abcdefg";
        string newLetters = "1234";
​
        string replaced = ReplaceLastLetters(originalString, 4, newLetters);
​
        Console.WriteLine(originalString); // abcdefg
        Console.WriteLine(replaced);       // abc1234
    }
}

Output:

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abcdefg
abc1234

1. Using `Remove()` method

Edit

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using System;
​
public class Program
{
    static string ReplaceLastLetters(string text, int letterCount, string newLetters)
    {
        string substring = text.Remove(text.Length - letterCount, letterCount); // abcdefg -> abc
        return substring + newLetters;
    }
​
    public static void Main(string[] args)
    {
        string originalString = "abcdefg";
        string newLetters = "1234";
​
        string replaced = ReplaceLastLetters(originalString, 4, newLetters);
​
        Console.WriteLine(originalString); // abcdefg
        Console.WriteLine(replaced);       // abc1234
    }
}