>>>

>>>        public static string[,] lines = new string[1,13];
>>>        static T[,] ResizeArray<T>(T[,] original, int rows, int cols)
>>>        {
>>>            var newArray = new T[rows, cols];
>>>            int minRows = Math.Min(rows, original.GetLength(0));
>>>            int minCols = Math.Min(cols, original.GetLength(1));
>>>            for (int i = 0; i < minRows; i++)
>>>                for (int j = 0; j < minCols; j++)
>>>                    newArray[i, j] = original[i, j];
>>>            return newArray;
>>>        }
>>>        public static void loadUploadedInvoices(string filename)
>>>        {
>>>            var work = File.ReadAllLines(filename).Select(a => a.Split("\t"[0])).ToArray();
>>>            int rows = work.Length-1;
>>>            string[,] work2 = new string[rows, 13];
>>>            for (int r=0; r<rows; r++)
>>>                for (int c= 0; c<13; c++)
>>>                {
>>>                    work2[r, c] = work[r][ c];
>>>                }
>>>            lines = AigFundedInvoices.ResizeArray<String>(work2, rows, 13);
>>>        }
>>>

>>>
>>>
>>>This kinda works, but I'm copying everything twice. Is there a way to do this by copying only once?
>>
>> Instead of ResizeArray you could use:

string[,] lines2 = (string[,]) work2.Clone();

But can I ask what you subsequently do with the array ?
>
>Thank you very much; Let me try that.
>
>Well the file that gets read by the Linq is just a csv without headers, 13 string fields really. I just need to read it in, and use some fields of it, so I thought I'd use array[1] for the second field and so on.

Depending on what you need you could use a class for invoice. e.g.

public class Invoice
    {
        public static explicit operator Invoice(string fields)
        {
            string[] array = fields.Split("\t"[0]).ToArray();
            var inv = new Invoice();
            inv.InvoiceNumber = Convert.ToInt32(array[0]);
            inv.InvoiceDate = Convert.ToDateTime(array[1]);
            inv.Company = array[2];
            //etc
            return inv;
        }
        public DateTime InvoiceDate { get; set; }
        public int InvoiceNumber { get; set; }
        public decimal Amount { get; set; }
        public string Company { get; set; }
    }

Your code could then just be:

IEnumerable<Invoice> invoices = File.ReadAllLines(fileName).Select(s => (Invoice)s);
//Do whatever