Try this
Console.WriteLine("input:3*3 matrics. number space number space number space enter");
int[,] input = new int[3, 3];
for (int i = 0; i < 3; i++)
{
for (int j = 0; j < 3; j++)
{
var key = Console.ReadKey();
if (key.Key != ConsoleKey.Spacebar && key.Key != ConsoleKey.Enter)
input[i, j] = Convert.ToInt32(key.KeyChar.ToString());
else
j--;
if (key.Key == ConsoleKey.Enter)
Console.WriteLine();
}
}
Console.WriteLine();
Console.WriteLine("output");
for (int i = 0; i < 3; i++)
{
for (int j = 0; j < 3; j++)
{
Console.Write(input[i,j] + " ");
}
Console.WriteLine( );
}