using System;

using System.Linq;

using System.Globalization;

​

string file = @"

10,89;01.06.2015

10,81;15.06.2015

9,89;15.07.2015

9,75;07.08.2015

9,21;15.09.2015

9,02;15.10.2015

9;17.11.2015

";

​

class Item

{

    public double Number { get; set; }

    public DateTime Date { get; set; }  

    public override string ToString()

    {

        return string.Format("{0} => {1}", Date, Number);   

    }

}

​

var items = 

    from row in file.Split(new[] {'\n'}, StringSplitOptions.RemoveEmptyEntries)

    let valuePair = row.Split(new[] { ';' })

    let number = double.Parse(valuePair[0].Replace(',', '.'))

    let date = DateTime.ParseExact(valuePair[1], "dd.MM.yyyy", CultureInfo.InvariantCulture)

    select new Item { Number = number, Date = date };

​

items.ToList().ForEach(Console.WriteLine);

​

​