This is a sample C# code which uses yfinance library to retrieve the ticker symbol MSFT

```csharp
using System;
using yfinance;

namespace ConsoleApp
{
    class Program
    {
        static void Main(string[] args)
        {
            var msftOptions = yfinance.Option.Get("MSFT");
            Console.WriteLine("Options data for MSFT:");
            Console.WriteLine(msftOptions.ToString());
        }
    }
}
```

You can get yfinance through the NuGet package library by opening the Package Manager Console in Visual Studio
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