CsharpHow-ToBeginner · 3 min read

How to Trim String in C#: Syntax and Examples

In C#, you can trim a string using the Trim() method, which removes all leading and trailing whitespace characters. You can also use TrimStart() or TrimEnd() to remove whitespace only from the beginning or end of the string respectively.

📐

Syntax

The Trim() method removes whitespace from both the start and end of a string. You can also specify characters to remove by passing them as parameters.

string.Trim(): Removes all leading and trailing whitespace.
string.TrimStart(): Removes whitespace from the start only.
string.TrimEnd(): Removes whitespace from the end only.
string.Trim(char[] chars): Removes specified characters from both ends.

csharp

string trimmed = original.Trim();
string trimmedStart = original.TrimStart();
string trimmedEnd = original.TrimEnd();
string trimmedChars = original.Trim(new char[] { '*', ' ' });

💻

Example

This example shows how to use Trim(), TrimStart(), and TrimEnd() to remove spaces and specific characters from a string.

csharp

using System;

class Program
{
    static void Main()
    {
        string original = "  ** Hello World! **  ";

        string trimmed = original.Trim();
        string trimmedStart = original.TrimStart();
        string trimmedEnd = original.TrimEnd();
        string trimmedChars = original.Trim(new char[] { ' ', '*'});

        Console.WriteLine($"Original: '{original}'");
        Console.WriteLine($"Trim(): '{trimmed}'");
        Console.WriteLine($"TrimStart(): '{trimmedStart}'");
        Console.WriteLine($"TrimEnd(): '{trimmedEnd}'");
        Console.WriteLine($"Trim(chars): '{trimmedChars}'");
    }
}

Output

Original: ' ** Hello World! ** ' Trim(): '** Hello World! **' TrimStart(): '** Hello World! ** ' TrimEnd(): ' ** Hello World! **' Trim(chars): 'Hello World!'

⚠️

Common Pitfalls

One common mistake is expecting Trim() to remove characters inside the string or only from one side without using the correct method. Also, Trim() without parameters only removes whitespace, not other characters.

To remove specific characters, you must pass them as a char[] to Trim(), TrimStart(), or TrimEnd().

csharp

string example = "--Hello--";

// Wrong: does not remove dashes
string wrongTrim = example.Trim();

// Right: removes dashes from both ends
string rightTrim = example.Trim(new char[] { '-' });

📊

Quick Reference

Method	Description	Removes
Trim()	Removes whitespace from start and end	Whitespace
TrimStart()	Removes whitespace from start only	Whitespace
TrimEnd()	Removes whitespace from end only	Whitespace
Trim(char[] chars)	Removes specified characters from start and end	Specified characters

✅

Key Takeaways

Use Trim() to remove whitespace from both ends of a string.

Use TrimStart() or TrimEnd() to trim only the start or end.

Pass a char[] to Trim() to remove specific characters.

Trim() without parameters only removes whitespace, not other characters.

Trimming does not remove characters inside the string, only from the edges.