Input string not in the correct format when reading a text file into a 2d Array

Question

I am trying to read a text file into a 2d array. However I get an error of

Input string was not in the correct format.

I have checked the text file and it is all as it should be and I cant see why this error is happening?

        int[,] numberMatrix = new int[10, 10];
        string[] split = null;

        for (int rowCount = 1; rowCount < 11; rowCount++)
        {
            int[] temp1DArray = new int[10];
            string fileLocation = "C:\\Week10\\one.txt";
            string textFile = File.ReadAllText(fileLocation);

            for (int columnCount = 1; columnCount < 11; columnCount++)
            {
                string delimStr = " ";
                char[] delimiter = delimStr.ToCharArray();
                //string fileLocation = "C:\\Week10\\1-100.txt";
                //string textFile = File.ReadAllLines(fileLocation);
                for (int x = 0; x <= 10; x++)
                {
                    split = textFile.Split(delimiter, x);
                }
            }

            for (int rowCount1 = 1; rowCount1 < 11; rowCount1++)
            {
                for (int columnCount = 1; columnCount < 11; columnCount++)
                {
                    numberMatrix[rowCount1 - 1, columnCount - 1]   =Convert.ToInt32(split.ElementAt(columnCount - 1));
                }
            }
        }

        for (int rowCount = 10; rowCount > 0; rowCount--)
        {
            for (int columnCount = 10; columnCount > 0; columnCount--)
            {
                Console.WriteLine(numberMatrix[rowCount - 1, columnCount - 1]);
            }
        }
    }

Answer 1

So ok, you haven't provided any file contents and exact Exception description (it can fire on any reason possible). I can give much more simple implementation for file parsing. I can't think of an answer, which will magically find the reason of why one number in your file can't be parsed to int

string[] lines = File.ReadAllLines(@"C:\temp\1.txt");
var options = StringSplitOptions.RemoveEmptyEntries;

int[][] numbers = lines.Select(line => line.Split(new[]{' '}, options)
                                           .Select(int.Parse)
                                           .ToArray())
                       .ToArray();

Console.WriteLine(string.Join(Environment.NewLine, 
                              numbers.Select(n => string.Join(" ", n))));

For file:

 1 10 20 30 4234 35 123 543 42 54 345 645 

prints:

1 10 20 30
4234 35 123 543
42 54 345 645

If you need rectangle array int[,] use next code to parse it to.

int [,] numbersRect = new int[numbers.Length, numbers[0].Length];

for (int i = 0; i < numbersRect.GetLength(0); i++)
{
    for (int j = 0; j < numbersRect.GetLength(1); j++)
    {
        numbersRect[i,j] = numbers[i][j];
    }
}

Answer 2

From where I standing split returns an array. And numberMatrix[rowCount1 - 1, columnCount - 1] is array element - not array itself. So numberMatrix[rowCount1 - 1, columnCount - 1] =Convert.ToInt32(split.ElementAt(columnCount - 1)); will fire an exception. Also Convert.ToInt32 takes a single value not an array.