void Main()
{
    //var content = File.ReadAllLines("YOUR_FILE.csv");
    var content = new string[] { "2018/12/13,Data1,100", "2018/12/14,Data2,200", "2018/12/14,Data3,300" };
    var models = content
        .Select(p => p.Split(','))
        .Select(p => new Model
        {
            Date = DateTime.Parse(p[0]),
            Data = p[1],
            Number = Convert.ToInt32(p[2])
        })
        .Dump();
}

class Model
{
    public DateTime Date { get; set; }
    public string Data { get; set; }
    public int Number { get; set; }
}