Creating a level from a textfile

Hello UA Community.

I was wondering how you would go about creating a level from a textfile. For example, reading in from a file like this

5

5

1 1 1 1 1

1 0 0 0 1

1 0 0 0 1

1 1 1 1 1

so the level should be a 5x5 grid enclosed with solid blocks. any help would be appreciated... c#