How to search for a string in a file

[shsh_shah]

How to search for a string in a file. As string might be somewhere in the middle of text file. :!:

Console.WriteLine("Input a string ");
String data = Console.ReadLine();
sr = File.OpenText(@"C:\username.txt");

String st = sr.ReadToEnd();
?????

help please?

thanks

[shsh_shah]

solution was st.contains it worked. Thanks anyway

[Lardmeister]

I would have used something like int pos = st.IndexOf(data);