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no more details when in design view?<br />
can you check the formula when in design view (are you using BIDs?)
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no more details when in design view?
can you check the formula when in design view (are you using BIDs?)

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I need to do an aggregate function to sum the number of hours, which is the data values in the image below. &nbsp;I need to place the aggregate function where the &quot;#Error&quot; is in the image. &nbsp;I already tried using the expression &quot;Sum(Fields!Hours.Value)&quot; but this does not work.<br />
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&nbsp;<a href="https://filedb.experts-exchange.com/incoming/2010/11_w47/370462/report.bmp" target="_blank" title="View of the Report (1.1 MB)"><img alt="View of the Report" class="file-block lazyload" style="max-width: 726px;" data-src="https://filedb.experts-exchange.com/incoming/2010/11_w47/370462/report.bmp" /></a>
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report.bmp

I need to do an aggregate function to sum the number of hours, which is the data values in the image below.  I need to place the aggregate function where the "#Error" is in the image.  I already tried using the expression "Sum(Fields!Hours.Value)" but this does not work.
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How to do aggregate function in Visual Studio Reporting Services

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C# is an object-oriented programming language created in conjunction with Microsoft’s .NET framework. Compilation is usually done into the Microsoft Intermediate Language (MSIL), which is then JIT-compiled to native code (and cached) during execution in the Common Language Runtime (CLR).