using System;

using System.Data;

using System.Collections.Generic;

using System.Linq;

public class Program

{

    public static void Main()

    {

        string csvData = @"field1,field2,field3,field4

value1,600,300,value9

value2,100,300,value4

value3,800,300,value5";

​

var lines = csvData.Split(new[] { '\n', '\r' }, StringSplitOptions.RemoveEmptyEntries);

var headers = lines[0].Split(',');

​

var result = new List<Dictionary<string, string>>(lines.Length - 1); // Pre-allocate list size

​

foreach (var line in lines.Skip(1))

{

    var values = line.Split(',');

    var rowDict = new Dictionary<string, string>(headers.Length);

​

    for (int i = 0; i < headers.Length; i++)

    {

        rowDict[headers[i]] = values[i];

    }

​

    result.Add(rowDict);

}

​

foreach (var dict in result)

{

    foreach (var kvp in dict)

    {

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

    }

    Console.WriteLine();

}

​

    }

}