Typed DataSet Question

I want to add two columns to a typed DataSet. I want the first of these columns to show the difference between two numbers (both doubles) and the second column to display a boolean indicating whether the difference is greater than zero.
 It seems to me that this should be possible, but I'm not sure how to do it (I work primarily in Java and am making a slow transition to C#).

An example would be very much appreciated.
marmaxxAsked:
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stanscott2Commented:
At design time, you can create new columns for a typed DataSet using expressions.  Detailed instructions for doing this can be found on the Microsoft MSDN site here:  

http://msdn2.microsoft.com/en-us/library/3df0c8ey(VS.71).aspx

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tolgaongCommented:
IF your typed dataset is on a project, and if you want to use it from an other project and just want to add those two columns, you cannot use designer.
you should manually create a datacolumn
DataColumn dc1 = new DataColumn();
then use the expression property to set value.
dc1.epression = "Column2" + "Column3"
place the code in form_load or initializeCode part.
For expression columns, you may use the link provided by stanscott2.
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