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Heat maps in SQL Server Reporting Services 2005

Heat maps in SQL Server Reporting Services 2005

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Warm up your users this winter with heat maps in SQL Server 2005:


This report was created by one of our testing gurus, Patrice Brassard, and uses a  to show up a dll he has written in c#. The code was used to simplify the process of applying conditional formatting in every cell of the report.

The DLL contains a static public method:

public static string GetColor(decimal redStartVal, decimal yellowStartVal, decimal greenStartVal, decimal val)


  • redStartVal represents the value where a pure red would be used
  • yellowStartVal represents the value where a pure yellow would be used
  • greenStartVal represents the value where a pure green would be used
  • val is the value where you need to get a heat map colour

The function returns a string corresponding to the Hex value of the colour.

The example report above represents test results so Patrice wanted only 100.00% to be shown green (i.e.99.99% should be yellow) so he used the following values:

WLX_SSRS_Utils.HeatMap.GetColor(70.0, 99.99, 100.00, (Sum(Fields!RawPass.Value) / (Sum(Fields!RawPass.Value) + Sum(Fields!RawFail.Value) + Sum(Fields!RawNotRun.Value))) * 100.0)).

Please note that the attached DLL that needs to be on both your dev machine and the SSRS server:

  • On the dev machine (say your PC), it needs to be deployed in %programfiles%\Microsoft Visual Studio 8\Common7\IDE\PrivateAssemblies
  • On the reporting server, it needs to be deployed in %ProgramFiles%\Microsoft SQL Server\MSSQL.x\Reporting Services\ReportServer\bin

Attachment: HeatMap.cs
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