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copied!<p>I've written something very similar. I used the FileSystemWatcher to get notifications about changes. I then used a FileStream to read the data (keeping track of my last position within the file and seeking to that before reading the new data). Then I add the read data to a buffer which automatically extracts complete lines and then outputs then to the UI.</p> <p>Note: "this.MoreData(..) is an event, the listener of which adds to the aforementioned buffer, and handles the complete line extraction.</p> <p>Note: As has already been mentioned, this will only work if the modifications are always additions to the file. Any deletions will cause problems.</p> <p>Hope this helps.</p> <pre><code> public void File_Changed( object source, FileSystemEventArgs e ) { lock ( this ) { if ( !this.bPaused ) { bool bMoreData = false; // Read from current seek position to end of file byte[] bytesRead = new byte[this.iMaxBytes]; FileStream fs = new FileStream( this.strFilename, FileMode.Open, FileAccess.Read, FileShare.ReadWrite ); if ( 0 == this.iPreviousSeekPos ) { if ( this.bReadFromStart ) { if ( null != this.BeginReadStart ) { this.BeginReadStart( null, null ); } this.bReadingFromStart = true; } else { if ( fs.Length > this.iMaxBytes ) { this.iPreviousSeekPos = fs.Length - this.iMaxBytes; } } } this.iPreviousSeekPos = (int)fs.Seek( this.iPreviousSeekPos, SeekOrigin.Begin ); int iNumBytes = fs.Read( bytesRead, 0, this.iMaxBytes ); this.iPreviousSeekPos += iNumBytes; // If we haven't read all the data, then raise another event if ( this.iPreviousSeekPos < fs.Length ) { bMoreData = true; } fs.Close(); string strData = this.encoding.GetString( bytesRead ); this.MoreData( this, strData ); if ( bMoreData ) { File_Changed( null, null ); } else { if ( this.bReadingFromStart ) { this.bReadingFromStart = false; if ( null != this.EndReadStart ) { this.EndReadStart( null, null ); } } } } } </code></pre>

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