ASP.Net Web Forms: How to download a file? How to save string to a file?

 private void SaveFile(string featureKey)

{
Response.ContentType = "text/plain";
Response.AppendHeader("Content-Disposition", "attachment;                                     filename=FeatureKey.txt");

 if (Response.IsClientConnected)
{
var buffer = Encoding.ASCII.GetBytes(featureKey);
var length = featureKey.Length;
Response.OutputStream.Write(buffer, 0, length);
}

 Response.Flush();
Response.End();

}

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