using System;

using System.Linq;

using System.Collections.Generic;

​

public class Program

{

    public static void Main()

    {

        List<KeyValue> data = new List<KeyValue>{

            new KeyValue

            {

                Key = "userName", Value = "userNameValue"

            },

            new KeyValue

            {

                Key = "password", Value = "passwordValue"

            },

            new KeyValue

            {

                Key = "domain", Value = "domainValue"

            }

        };

        Dictionary<string, string> dict = data.ToDictionary(x => x.Key, x => x.Value);

        foreach (var kvp in dict)

        {

            Console.WriteLine($"Key: {kvp.Key}, Value: {kvp.Value}");

        }

    }

}

​

public class KeyValue

{

    public string Key {get;set;}

    public string Value {get;set;}

}