how do I calculte the week of the year calculation in visual studio 2010

You should look at .net method GetWeekOfYear ( http://msdn.microsoft.com/en-us/library/system.globalization.calendar.getweekofyear(v=vs.110).aspx )
There are many considerations for invoking it, depending on your culture specifics. Here is an example of usage:

var dt = DateTime.Now;
CultureInfo.InvariantCulture.Calendar.GetWeekOfYear (dt, CalendarWeekRule.FirstDay, DayOfWeek.Monday);

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I'm not familiar with variable declaration within calculated fields in an SSRS dataset; your example looks more like VB code, correct?

To compensate, I tried the suggestion in this form:

=CultureInfo.InvariantCulture.Calendar.GetWeekOfYear(Fields!ODR_DATE.Value,CalendarWeekRule.FirstDay,DayofWeek.Sunday);

When I try to preview my report an error message appears essentially saying

'CultureInfo' is not declared.  It may be inaccessible due to its protection level.

This occurred even though Intellisense recognized the CultureInfo.InvariantCulture.Calendar.GetWeekofYear method.

Perhaps you could help me understand how to get the week of year from within an SSRS project.

adding System.Globalization. before CultureInfo and also before CalendarWeekRule did the trick.

Thanks!

by the way, if you have links/recommendations on where I can learn more about all of the methods available (through Visual Studio?), I'd appreciate it.