Convert string from text file to integer array

I wrote this code in order to open a text file in a C# language Each line in the file contains five digits such as

0    0    2    3     6

0    1    4    4     7

0    2    6    9     9

1    0    8    11    9

1    1    12   15    11

2    2    12   17    15

The distance between the number and the other is one tab The problem is when you execute the program this error appears

input string was not in correct format in Convert.ToInt32(t[j])

code:

string[] st = File.ReadAllLines("C:\\testing\\result.txt");
int[,] tmp = new int[st.Length - 1, 5];
for (int i = 1; i < st.Length; i++)
{

   string[] t = st[i].Split(new char[] { ' ' });
   int cnt = 0;
   for (int k = 0; k < t.Length; k++)
        if (t[k] != "")
           { t[cnt] = t[k]; cnt++; }
        for (int j = 0; j < 5; j++)
                tmp[i - 1, j] = Convert.ToInt32(t[j]);
 }

How can i correct that?