Why string handling matters in C Sharp (C#) - See It in Action

Why string handling matters

📖 Scenario: Imagine you are building a simple program that manages a list of names for a small event. You need to store names, check their length, and display them properly. Handling strings correctly is very important to make sure names are stored and shown as expected.

🎯 Goal: You will create a list of names, set a maximum allowed length for names, filter out names that are too long, and then display the valid names.

📋 What You'll Learn

Create a list of strings with exact names

Create an integer variable for maximum name length

Use a loop to filter names by length

Print the filtered names

💡 Why This Matters

🌍 Real World

Handling strings is important in many programs, like managing user names, product names, or messages. Filtering by length helps keep data clean and user-friendly.

💼 Career

Many programming jobs require working with text data. Knowing how to handle strings, check their length, and filter them is a basic but essential skill.

1

Create the list of names

Create a list of strings called names with these exact entries: "Alice", "Bob", "Charlotte", "David", "Eleanor".

C Sharp (C#)

// Create the list of names
// Your code here

Need a hint?

Use List<string> and initialize it with the exact names inside curly braces.

2

Set the maximum allowed name length

Create an integer variable called maxLength and set it to 6.

C Sharp (C#)

using System;
using System.Collections.Generic;

class Program
{
    static void Main()
    {
        List names = new List { "Alice", "Bob", "Charlotte", "David", "Eleanor" };
        // Create maxLength variable
        // Your code here
    }
}

Need a hint?

Use int maxLength = 6; to set the maximum length allowed for names.

3

Filter names by length

Create a new list of strings called validNames. Use a foreach loop with variable name to go through names. Inside the loop, add name to validNames only if its length is less than or equal to maxLength.

C Sharp (C#)

using System;
using System.Collections.Generic;

class Program
{
    static void Main()
    {
        List names = new List { "Alice", "Bob", "Charlotte", "David", "Eleanor" };
        int maxLength = 6;
        // Create validNames list
        List validNames = new List();
        // Use foreach loop to filter names
        // Your code here
    }
}

Need a hint?

Use foreach (string name in names) and inside it check if (name.Length <= maxLength) to add to validNames.

4

Print the valid names

Use a foreach loop with variable validName to go through validNames and print each name using Console.WriteLine(validName);.

C Sharp (C#)

using System;
using System.Collections.Generic;

class Program
{
    static void Main()
    {
        List names = new List { "Alice", "Bob", "Charlotte", "David", "Eleanor" };
        int maxLength = 6;
        List validNames = new List();
        foreach (string name in names)
        {
            if (name.Length <= maxLength)
            {
                validNames.Add(name);
            }
        }
        // Print valid names
        // Your code here
    }
}

Need a hint?

Use foreach (string validName in validNames) and inside it Console.WriteLine(validName); to print each valid name.