How do I load and parse files on C#

After gazing into my crystal ball in an effort to divine the contents of said text files, I got nothin.

Loading a text file (or finding out how to) is beyond the trivial.

using (StreamReader stream = new StreamReader("TestFile.txt"))
{
    String text = stream.ReadToEnd();
}
if (!string.isNullOrEmpty(text)
{
    string[] lines = text.Split('\n');
    string lines[];
    foreach(string line in lines)
    {
        // do somthing with your line of text
    }
}

I recommend that you work on your google foo.

EDIT: MTH 2016-12-05
You have a variable's scope problem (String text).
It will fail on files that don't fit in memory.
And it could be a bit simpler.

foreach (string line in File.ReadLines("TestFile.txt"))
{
  // do something with your line of text
}