[Edit]

C# / .NET - remove first n characters from string

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Created by:

Marcino

720

In this article, we would like to show you how to remove the first n characters from the string in C# / .NET.

Quick solution:

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string text = "ABCD";
int n = 3;
string result = text[n..];
​
Console.WriteLine(result);  // D

Practical examples

Edit

1. Using String `Substring()` method

Edit

In this example, we use String Substring() method to create a new result substring from the text string without the first n characters.

Syntax:

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Substring(int startIndex, int length);

Note:

If length is not given, substring will be done from startIndex to the end of the text.

Practical example:

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using System;
​
public class StringUtils
{
    public static void Main(string[] args)
    {
        string text = "ABCDE";
​
        int n = 3;
        string result = text.Substring(n);
        Console.WriteLine(result);  // DE
    }
}

Output:

xxxxxxxxxx
 
DE

2. Using range operator `..`

Edit

The range operator .. is used to make a slice of the collection.

Practical example:

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using System;
​
public class StringUtils
{
    public static void Main(string[] args)
    {
        string text = "ABCDE";
​
        int n = 3;
        string result = text[n..];  // text[Range.StartAt(n)]
        Console.WriteLine(result);  // DE
    }
}

Output:

xxxxxxxxxx
 
DE

3. Using StringBuilder `Remove()` method

Edit

In this example, we create sb StringBuilder object from the text string, then we use Remove() method on the sb to delete the first 3 characters.

Syntax:

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Remove(int startIndex, int length)

Practical example:

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using System;
using System.Text;
​
public class StringUtils
{
    public static void Main(string[] args)
    {
        string text = "ABCDE";
​
        // Create StringBuilder object
        StringBuilder sb = new(text);
​
        // Remove first n characters
        int n = 3;
        sb.Remove(0, n);
​
        Console.WriteLine(sb);
    }
}