At the top of your page you require:
<br />
using System.IO;<br />
Then where you are doing the read you'll require:
<br />
FileStream file = new FileStream("c:\path\to\file.txt", FileMode, FileAccess);<br />
<br />
StreamReader sr = new StreamReader(file);<br />
<br />
string s = sr.ReadToEnd();<br />
<br />
sr.Close();<br />
<br />
file.Close();<br />
<br />
Hope that helps!