なるほど、同じ挨拶プログラムをRustではなくC#で実装したいようですね。そうですか？もしそうなら、ユーザーの名前を尋ねて挨拶を出力するC#プログラムを以下に示します：
```csharp
using System;

class Program
{
    static void Main()
    {
        Console.Write("What is your name? ");
        string name = Console.ReadLine();

        Console.WriteLine("Hello, {0}!", name);
    }
}
```
C#コードの説明や修正が必要でしたらお知らせください。様々なプログラミング言語でのプログラムの学習や実装のお手伝いをさせていただきます。
I see, it appears you would like to implement the same greeting program in C# instead of Rust. Is that correct? If so, here is a C# program that asks for the user's name and outputs a greeting:
```csharp
using System;

class Program
{
    static void Main()
    {
        Console.Write("What is your name? ");
        string name = Console.ReadLine();

        Console.WriteLine("Hello, {0}!", name);
    }
}
```
Let me know if you would like me to explain or modify anything in the C# code. I'm happy to assist you with learning and implementing programs in different programming languages.