check if string exists in a file

Question

I have the following piece of code which opens a text file and reads all the lines in the file and storing it into a string array.

Which then checks if

Answer 1

Sounds overly complex, no reason to check by line or anything if you want to know if a string is present in a file. You can replace all of your code simply with :

if(File.ReadAllText(path).Contains(domain))
{
    MessageBox.Show("There is a match");
}