Using a main report parameter on a subreport in Crystal Reports Viewer

I'm using C# 4.0 to display a Crystal Reports Viewer report.

The CR report contains a subreport. I need to add a parameter MachineSN to the subreport.

I've added the parameter to the main report but I can't access it in the subreport. On the main report I can right-click on the subreport box and choose Change Subreport Links. If I select MachineSN, it wants to create a filter.

If I manually add a parameter MachineSN to the subreport, I'm prompted for it when the report runs.

So, how can I make MachineSN available on the subreport?
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BlearyEyeAsked:
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peter57rCommented:
If you just want to use the parameter value in expressions or formulas (but not as part of the 'link' ) then you can pass the value using a shared variable.

Declare the variable in the main report header and assign the parameter value to it and then you can pick it up in the subreport by  declaring it in any formula you want to use it.

Shared stringvar myvariable;
myvariable:={?myparam};
""
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BlearyEyeAuthor Commented:
I might add that I wan the parameter only to display on the subreport. It does not enter into any filtering of data.
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nsonbatyCommented:
do you need to just show the MachineSN, in the subreport as text or your need to extract data related to this MachineSN.
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BlearyEyeAuthor Commented:
peter57r: that did the trick.

shared variables are tricky ... it took me a while to figure out that they have to appear on the main report somewhere in order to get initialized and show up on the subreport.
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