Input string for parsing CSV file not in correct format

I am trying to store a CSV file containing the following data to a list:

I have the following code which successfully saves the CSV to App_Data folder:

public static IEnumerable<Product> CSVProducts;

        public static IEnumerable<Product> CSVToList(HttpPostedFileBase CSVFile)
        {

            if (CSVFile == null || CSVFile.ContentLength == 0)
            {
                throw new InvalidOperationException("No file has been selected for upload or the file is empty.");
            }

            // saves the file into a directory in the App_Data folder
            var fileName = Path.GetFileName(CSVFile.FileName);
            var path = Path.Combine(HttpContext.Current.Server.MapPath("~/App_Data/"), fileName);
            CSVFile.SaveAs(path);


            CSVProducts = from line in File.ReadAllLines(path).Skip(1)
                          let columns = line.Split(',')
                          select new Product
                          {
                              Id = int.Parse(columns[0]),
                              Barcode = columns[13],
                              Name = columns[1],
                              CategoryName = columns[9],
                              Description = columns[2],
                              Price = int.Parse(columns[4])
                          };

            return CSVProducts;
        }

However, the LINQ query to get a list gives the following error message:

Input string was not in a correct format.

Source Error: 


Line 31:             CSVProducts = from line in File.ReadAllLines(path).Skip(1)
Line 32:                           let columns = line.Split(',')
Line 33:                           select new Product
Line 34:                           {
Line 35:                               Id = int.Parse(columns[0]),

Source File: C:\Users\Documents\Visual Studio 2015\Projects\Website\Models\Repository.cs

Line: 33 

When I debug in Visual Studio, I can't see what's inside the variables inside the LINQ query, but I can see what is inside CSVProducts and the 'Current' property for it has a value of null.

This is the class for Product and Category:

    public class Product
    {
        public int Id { get; set; }
        public string Barcode { get; set; }
        [Required]
        public string Name { get; set; }
        public string Description { get; set; }
        [Required]
        public Byte[] Image { get; set; }
        [Required]
        public Decimal Price { get; set; }
        [Required]
        public bool ShowOnIndex { get; set; }
    }

    public class Category
    {
        public int Id { get; set; }
        [Required]
        public string Name { get; set; }
        [Required]
        public Byte[] Image { get; set; }
        public virtual ICollection<Product> Products { get; set; }
    }