Entity Framework question Part 3, asp.net

I am trying to replace SoftwareID (under Title column) with tblSoftware.Title. Likewise, put tblSoftware.UnitPrice in this field (temporarily it is showing the value from Quantity field). Lastly, have a calculated field S. Total (Quantity * UnitPrice).

If this was a single gridview, I would cycle through the gv and multiply Quantity * UnitPrice values and place it in S. Total. But here the situation is different. We have three nested grid view which makes it a bit complicated.

Question: How to pull Title and UntiPrices from tblSowtware (using EF); and adding S. Total calculated field?

FYI: The project solution (EF_YouTube.zip about 1.1 MB with db file in it is at:  https://onedrive.live.com/?cid=420CDD6A13807C9B&id=420CDD6A13807C9B%21116 for additional information. It is developed in vs2012 and uses SQLEXPRESS12) EF7EF6
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Mike EghtebasDatabase and Application DeveloperAsked:
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Fernando SotoRetiredCommented:
Hi Mike;

When I download the above project it downloads the project from Part 2 so the extra column, Total Purchase, is not there. Can you upload the latest please.
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Mike EghtebasDatabase and Application DeveloperAuthor Commented:
Sorry about that. I uploaded right one.

Mike
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Fernando SotoRetiredCommented:
Hi Mike;

I am looking at it but seeming I have not worked much with the EntityDataSource control I am finding it limiting. I can not see how to configure it to calculate the total column for you. I am thinking of some how getting a reference to the data context and calculate it that way but then I need to figure out how to fill the column.

You may want to place a Request For Attention and have EE send out some emails to others to see if they can help with this.
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