3 biggest advantages of C# 4.0 versus C# 3.5?

I was asked this in an interview and had no answer for him.

Any idea?
newbiewebSr. Software EngineerAsked:
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Techn9cianCommented:
I wouldn't be able to tell you what these mean, but I found these three features added in 4.0:
1.)     Dynamic binding
2.)    Named and optional arguments
3.)    Generic co- and contravariance
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Kiran SonawaneProject LeadCommented:
Here is good link to go through above features by Techn9cian

http://www.codeproject.com/KB/cs/CSharp4Features.aspx
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newbiewebSr. Software EngineerAuthor Commented:
Thanks, That's what I was looking for...
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sachinpatil10dCommented:
Named and Optional Parameters
Dynamic Support
Variance
COM Interop

C# 4.0's New Features Explained
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newbiewebSr. Software EngineerAuthor Commented:
Thanks!
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