Capitalize the First Letter of Each Word in a String

When working with text data in C#, one of the most common formatting tasks is converting a normal sentence into Title Case, where the first character of every word becomes uppercase while the remaining characters become lowercase.

Title Case is a text format where each word starts with an uppercase letter and the rest of the letters are lowercase.

"hello world from c#" → "Hello World From C#"

1. Using Basic C# Logic

This approach is perfect for beginners. In this:

1. Split the sentence
2. Capitalize the first letter
3. Lowercase the rest
4. Join everything back

using System;

class Program
{
    static void Main()
    {
        string input = "hello world from c#";
        string[] words = input.Split(' ', StringSplitOptions.RemoveEmptyEntries);

        for (int i = 0; i < words.Length; i++)
        {
            string w = words[i];
            words[i] = char.ToUpper(w[0]) + w.Substring(1).ToLower();
        }

        string result = string.Join(" ", words);
        Console.WriteLine(result);
    }
}

Hello World From C#

2. Using LINQ

This method is cleaner and more expressive. It uses Split, Select, and string.Join.

using System;
using System.Linq;

class Program
{
    static void Main()
    {
        string input = "hello world from c#";

        var result = string.Join(" ",
                     input.Split(' ', StringSplitOptions.RemoveEmptyEntries)
                          .Select(word => char.ToUpper(word[0]) + word.Substring(1).ToLower()));

        Console.WriteLine(result);
    }
}

Hello World From C#

3. Using C# Built-in CultureInfo

C# also provides a built-in API that provides proper case conversion using the System.Globalization namespace.

using System;
using System.Globalization;

class Program
{
    static void Main()
    {
        string input = "hello world from c#";
        TextInfo textInfo = CultureInfo.CurrentCulture.TextInfo;

        string result = textInfo.ToTitleCase(input.ToLower());
        Console.WriteLine(result);
    }
}

Hello World From C#