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Data Validation in a 3 tier application

Posted By:      Posted Date: August 31, 2010    Points: 0   Category :ASP.Net
Say you have a form  designed in  Silverlight(Front end)-Asp.NEt(business layer)-SQl(bakcend)Should data validation occur on all 3 layers or just the presentation layer or  a combination of the front end with the other 2  e.g. validating an email address? I'm trying to undestand as to why if data has been validated on the presentation  why further data validation would be necessary  especially if there would be large amounts of data being validated and this could potentially slow down database transactions? 

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