title: stringbuilder append text with variables
body: <p>I have this line, how do I append text with the varaibles to make up the headings?</p>
  
  <pre><code>  StringBuilder sb = new StringBuilder();
    week6 = model.SelectedSunday.AddDays(-7);
    week5 = week6.AddDays(-7);
    week4 = week5.AddDays(-7);
    week3 = week4.AddDays(-7);
    week2 = week3.AddDays(-7);
    week1 = week2.AddDays(-7);
    sb.AppendLine("Title, Total, " week6, week5, week4, week3, week2, week1 );
  </code></pre>
  
  <p>and also this code:</p>
  
  <pre><code> var tradesmenReportData = _reportingService.GetTradeUKKPITradesmen(model.SelectedSunday);
    var jobSortedReportData = _reportingService.GetTradeUKKPIJobSorted(model.SelectedSunday);
    foreach (var item in tradesmenReportData)
    {
      sb.AppendLine(String.Concat("\"", item.Title, "\", item.Total, "\", item.Week6, "\", ", item.Week5, "\", ", item.Week4, "\", ", item.Week3, "\", ", item.Week2, "\", ", item.Week1));
  
    }
  </code></pre>
  
  <p>In the output file(excel), the values has a " appended to the values? Somewhere in above line there is an extra ".Where have I gone wrong?</p>
  
  <p>thanks</p>