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    <p>Here is a FileWriter with StringBuilder buffer. It uses a separate thread to write while main thread keeps accumulating data. Writes 10MB buffer at a time. Buffered data is kept in Queue object; writer thread removes item from this Queue and writes it out full using with File.AppendAllText method.</p> <pre><code>private Queue&lt;StringBuilder&gt; writeQueue; private bool isComplete; public void FileWriter() { this.isComplete = false; this.writeQueue = new Queue&lt;StringBuilder&gt;(); var writer = new Action&lt;string&gt;(this.StartWriting); var writerAsync = writer.BeginInvoke(@"outputfile.txt", null, null); using (StreamReader sr = new StreamReader(@"inputfile.txt")) { var fileHeaders = sr.ReadLine() .Split('\t') .Where(i =&gt; !string.IsNullOrEmpty(i)) .Select(j =&gt; j.Trim()) .ToList(); var buffer = new StringBuilder(); while (!sr.EndOfStream) { var originalLine = sr.ReadLine() .Split('\t') .Where(i =&gt; !string.IsNullOrEmpty(i)) .Select(j =&gt; j.Trim()) .ToList(); var line = new StringBuilder(); //Must have same number of items if (originalLine.Count == fileHeaders.Count) { for (int i = 0; i &lt; fileHeaders.Count(); i++) { line.AppendFormat("{0}={1}&amp;", fileHeaders[i], originalLine[i]); } line.AppendLine(); } buffer.AppendLine(line.ToString()); if (buffer.Length &gt; 1024 * 1024 * 10)//approx 10MB { lock (this.writeQueue) { this.writeQueue.Enqueue(buffer); } buffer = new StringBuilder(); } } //Queue any final remaining data if (buffer.Length&gt;0) lock (this.writeQueue) { this.writeQueue.Enqueue(buffer); } } this.isComplete = true; writer.EndInvoke(writerAsync); } private void StartWriting(string outFilePath) { while (!this.isComplete || this.writeQueue.Count &gt; 0) { StringBuilder queuedItem; if (this.writeQueue.Count &gt; 0) { lock (this.writeQueue) { queuedItem = this.writeQueue.Dequeue(); } File.AppendAllText(outFilePath, queuedItem.ToString()); } System.Threading.Thread.Sleep(5000); //Sleep 5sec } } </code></pre>
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    1. POTextWriter.WriteLine IO Exception - The specified network name is no longer available
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    1. COOne more question ... even though I use buffer, there still will be limitation to the number of threads I run concurrently depending on a server ?
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    2. CONumber of threads would be limited by CPU time and resources. You will have to test whats optimal with different numbers to see whats optimal. Try with 2 and move up until you don't see any more performance gain. But ultimately you will be bottle-necked by network traffic for your remote file write to complete. And also, if you would be using this, then accept this as answer and vote up.
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Detail views are divided into sections. All the information in the data section comes from columns in the selected row. The other sections display data from other, related rows.

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