How to solve the problem of the concatenation code in the exam

Question

i wrote the code in the right format but i dont know why the compiler makes error
```CodeChallenge.cs
using System;
string firstName;
firstName = Console.ReadLine();
//firstName = firstName +  " rocks !"
System.Console.WriteLine(firstName +  " rocks !");
//Console.WriteLine( " rocks !"  );
```

Sebastian Wilson · Accepted Answer

The answer below works 
There is no space between rocks and the ! but there is a space before hand. So it's " rocks!" Not "rocks !" 
var firstName = Console.ReadLine();
Console.WriteLine(firstName + " rocks!");

Kjetil Lorentzen · Answer

The code challenges are extremely sensitive when entering the text they ask for.
In your case you should enter " rocks!" Instead of " rocks !".
Also, for the code challenge the using System directive is not necessary.
```C#
string firstName = Console.ReadLine();
Console.WriteLine(firstName + " rocks!");
```

Jennifer Nordell · Answer

Hi!  I got your request to answer, but see that two others have done a great job already.  To reiterate what they've said, challenges are very strict and when they ask for you to do something your output (generally speaking) must be exactly as they want it to the letter.  This includes capitalization, punctuation, spelling, and even spacing.
@Kjetil Lorentzen (https://teamtreehouse.com/kjetillorentzen) is correct.  There is no need for the using directive.  This is what is causing your compiler error.
Tip :bulb:  Going forward into the challenges it's important to try not to do anything the challenge doesn't explicitly ask for.  Even if functional outside the challenge, it can cause the challenge to fail.
Happy coding! :sparkles:

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How to solve the problem of the concatenation code in the exam

3 Answers

Sebastian Wilson

Sebastian Wilson

wael dibs

wael dibs

Kjetil Lorentzen

Kjetil Lorentzen

Jennifer Nordell

Jennifer Nordell