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You can convert YAML to JSON using YamlDotNet in C# by following these steps:

1. Install YamlDotNet package in your project. You can do this using the NuGet package manager.

2. Import the YamlDotNet library in your C# code by adding the following line at the top of your file:

   using YamlDotNet.Serialization;
   

3. Define your YAML data as a string.

4. Create an instance of the Deserializer class from the YamlDotNet library:

   var deserializer = new DeserializerBuilder().Build();
   

5. Deserialize your YAML data using the deserializer:

   var yamlObject = deserializer.Deserialize(new StringReader(yamlString));
   

6. Create an instance of the JsonSerializer class from the Newtonsoft.Json library:

   var jsonSerializer = new JsonSerializer();
   

7. Serialize your deserialized object to JSON using the JsonSerializer:

   var jsonTextWriter = new StringWriter();
   jsonSerializer.Serialize(jsonTextWriter, yamlObject);
   var jsonString = jsonTextWriter.ToString();
   

8. Your YAML data has now been converted to JSON and stored in the jsonString variable.

Here's the complete code:

using System;
using System.IO;
using YamlDotNet.Serialization;
using Newtonsoft.Json;

class Program
{
    static void Main(string[] args)
    {
        var yamlString = @"
            name: John
            age: 30
            hobbies:
              - photography
              - hiking
        ";

        var deserializer = new DeserializerBuilder().Build();
        var yamlObject = deserializer.Deserialize(new StringReader(yamlString));

        var jsonSerializer = new JsonSerializer();
        var jsonTextWriter = new StringWriter();
        jsonSerializer.Serialize(jsonTextWriter, yamlObject);
        var jsonString = jsonTextWriter.ToString();

        Console.WriteLine(jsonString);
    }
}