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ViewState error

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I have two charts on an ASPX page the user can choose which charts to 

display, changing one at a time. There is a fair bit of calculation behind

them so I store the one that isn't changing in the viewstate. This seems to

work until the user starts flicking between charts a lot. Then they get this


"Value cannot be null. Parameter name: obj"

I've aplied the latest service pack etc. but to no avail. The error is not

fired from any of my code, so I can only assume chartFX is having an issue.

Any ideas?


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