accessing a specific area in a file...?

How can i access a specific range of characters in file?

for example I want to open a text file and read from character #39 to character #99.

Is there a way of doing this without reading the whole file using the FileStream.ReadToEnd() Method, and then accessing the specific characters???
The ReadToEnd method could take a long time if it's a big file, and i only need a small portion of the file content...

FileStream.Seek()

Or:

Code:

---

        //Create a file stream from an existing file.
        FileInfo fi=new FileInfo("c:\\csc.txt");     
        FileStream fs=fi.OpenRead();

        //Read 100 bytes into an array from the specified file.
        int nBytes=100;
        byte[] ByteArray=new byte[nBytes];
        int nBytesRead=fs.Read(ByteArray, 0, nBytes);
        Console.WriteLine("{0} bytes have been read from the specified file.", nBytesRead.ToString());

---

Thanks!
I'll try it, and get back to you...