conditional background color

Hello,

Is it possible to do conditional background color formatting on Matrix?

Thanks,

You can do that by setting the background color to the following expression:
=IIF(RunningValue(Fields!YourField.Value, CountDistinct, Nothing) Mod 2 = 1, "Color1", "Color2")
RunningValue returns an aggregate. In this case, it will keep counting "YourField" values:
YourField | Result of "RunningValue(Fields!YourField.Value, CountDistinct, Nothing)"
1 | 1
5 | 2
23 | 3
etc
If you would replace "CountDistinct" with for example "Sum", it would work like:
1 | 1
5 | 6
23 | 29
etc
The rest of the expression should be self explanatory.