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A common requirement for Reporting Services reports is to colour alternate rows. This blog gives two approaches, one of which uses custom assemblies.
This blog shows how you can create alternate colours in a report, using a simple way (which sometimes works), and then a more complicated (but more reliable) way. I'm intending it as a practical example of the use of custom assemblies.

The effect we're trying to achieve.
The rest of this blog is split into 2 parts: a simple way to create alternate colours using conditional formatting, and a more complicated way using a custom assembly.
A common requirement for Reporting Services reports is to colour alternate rows. This blog gives two approaches, one of which uses custom assemblies.
Comments on this blog
This blog has 2 comments:
If I'm trying to alternate the colours for group header rows (useful with drill downs / outlining), I've used something like this:
=IIF(RunningValue(Fields!fieldname.Value, COUNTDISTINCT, NOTHING) MOD 2 = 0, "Gray", "White")