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    Should i add a unique ID for many-to-many relation table in my asp.net MVC?

    I am working on a hotel reservation system using asp.net MVC 3 and i have the following tables:- 1.Customer table that have:- -Customer_ID (PK) -FirstName -DateOfBirth -etc... 2.Room table -Room_number (PK) -Type -etc... for the reservation i have two approaches either by having...
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    Dinner dinner = db.Dinners.Single(d => d.DinnerID == 1) Means in asp.net?

    i do on a example about ASP.net and i found the following lone of code:- // Retrieve Dinner object that reprents row with DinnerID of 1 Dinner dinner = db.Dinners.Single(d => d.DinnerID == 1); so i understand that we are creating a dinner object of Dinner class where Dinnerid equal 1, but...
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    could the media files contain harmful programs or virus or spywares?

    I used to download media files and clips from a site; the files extension includes (avi, wmv ,etc) and last week I tried to access the site then on the first page a message that say that the site is blocked because it use to contain harmful contents that might steal our personal information ...
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