C# Program to Capitalize the First Character of Each Word in a String

Table of Contents

1 Problem Statement:
2 Solution Approach:

Problem Statement:

Consider a scenario where you have a string and need to capitalize the first letter of each word in that string. For example, if the input string is “hello world,” the output should be “Hello World.”

Solution Approach:

We’ll break down the problem into smaller steps and write a C# Program to Capitalize the first character of each word in a String.

Method 1: Capitalize the First Character of Each Word Using LINQ

We can split the input string into words, capitalize the first character of each word, and then join them back into a string. Here’s how we can achieve this using LINQ:

using System;
using System.Linq;

namespace CapitalizeWords
{
    class Program
    {
      /* C# Program to Capitalize a First letter of Each word in a string*/
        static void Main(string[] args)
        {
        string inputString = "hello world";
    Console.WriteLine($"Original string: { inputString}");
    Console.WriteLine($" Capitalized string: {CapitalizeWords(inputString)}");
        }

        public static string CapitalizeWords(string inputString)
        {
         // First, Split the input string into words and then capitalize the first character of each word,
        // and join them back
            return string.Join(" ", inputString.Split(' ').Select(word => char.ToUpper(word[0]) + word.Substring(1)));
        }
    }
}

Output:

Original string: hello world
Capitalized string: Hello World

Method 2: Using TextInfo.ToTitleCase()

Another approach is to use the TextInfo.ToTitleCase() method from the System.Globalization namespace. This method capitalizes the first character of each word in a given string:

using System;
using System.Globalization;

namespace CapitalizeWords
{
    class Program
    {
         /* Program to Capitalize a First letter of Each word in a string in C# */
        static void Main(string[] args)
        {

            string inputString = "hello world";
            Console.WriteLine($"Original string: { inputString}");
            string outputString = CultureInfo.CurrentCulture.TextInfo.ToTitleCase(inputString.ToLower());

            Console.WriteLine($"Capitalized string: { outputString}");
        }
    }
}

Output:

Original string: hello world
Capitalized string: Hello World

Method 3: Using String Manipulation Functions

Let’s write a C# Program to capitalize the first character of each word in a string using manipulation functions.

using System;

class Program
{
      /* C# Program to Capitalize a First letter of Each word in a string*/
    static void Main(string[] args)
    {
        string input = "hello world";
        Console.WriteLine($"Original string:{input}"); 
        string[] words = input.Split(' ');

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

        string output = string.Join(" ", words);
        Console.WriteLine($"Capitalized string:{output}"); 
        // Output: Hello World
    }
}

Output:

Original string: hello world
Capitalized string: Hello World

Code Explanation:

We split the input string into an array of words using the Split function.
Then, we iterate over each word and capitalize its first character using char.ToUpper and string concatenation.
Finally, we join the modified words back into a string using string.Join.

Method 4: Using Regular Expressions

Now we will write a C# Program to capitalize the first character of each word in a string using regular expressions.

using System;
using System.Text.RegularExpressions;

class Program
{
    static void Main(string[] args)
    {
        string input = "hello world";
        string output = Regex.Replace(input, @"\b\w", m => m.Value.ToUpper());
        Console.WriteLine(output); // Output: Hello World
    }
}

Code Explanation:

In the above code snippet, We have used a regular expression \b\w to match the first character of each word.
The Regex.Replace function replaces each match with its uppercase equivalent.

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Shekh Ali

Meet Sheikh Ali, a skilled Software engineer and passionate a blogger. He enjoys sharing his expertise in C#, Java, SQL, Design Patterns, and other related topics through his writing. When he's not coding, Sheikh Ali can often indulge in his passions for reading books and fitness training.

Problem Statement:

Solution Approach:

Method 1: Capitalize the First Character of Each Word Using LINQ

Method 2: Using TextInfo.ToTitleCase()

Method 3: Using String Manipulation Functions

Method 4: Using Regular Expressions

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