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?