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Morgan Cheng
Beijing, China
morgancheng.com
I am a software engineer in China. This is
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Top Questions
138
votes
How can I check whether a variable is defined in JavaScript?
javascript
dom
undefined
asked Feb 6 '09 at 4:49
stackoverflow.com
110
votes
What requests do browsers' “F5” and “Ctrl + F5” refreshes generate?
http
browser
caching
cross-browser
refresh
asked Dec 22 '08 at 2:00
stackoverflow.com
52
votes
How is Generic Covariance & Contra-variance Implemented in C# 4.0?
c#
c#-4.0
covariance
contravariance
generic-variance
asked Oct 29 '08 at 2:27
stackoverflow.com
47
votes
How to add 30 minutes to a javascript Date object?
javascript
date
date-manipulation
asked Jul 29 '09 at 3:34
stackoverflow.com
31
votes
Why XML-Serializable class need a parameterless constructor
c#
.net
xml-serialization
asked Nov 6 '08 at 5:33
stackoverflow.com
31
votes
Why have “while(1);” in XmlHttpRequest response?
javascript
ajax
json
xmlhttprequest
asked May 16 '09 at 2:05
stackoverflow.com
30
votes
C# Captured Variable In Loop
c#
closures
captured-variable
asked Nov 7 '08 at 7:26
stackoverflow.com
23
votes
How to remove thie “.svc” extension in RESTful WCF service?
wcf
rest
asked Dec 10 '08 at 5:41
stackoverflow.com
23
votes
What's the difference between window.location and document.location in JavaScript?
javascript
documentation
window.location
asked Mar 12 '10 at 6:33
stackoverflow.com
21
votes
Why does IEnumerable<T> inherit from IEnumerable?
c#
generics
ienumerable
asked Oct 21 '08 at 12:46
stackoverflow.com
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Top Answers
13
Is it possible to force ignore the :hover pseudoclass for iPhone/iPad users?
stackoverflow.com
6
Where is a good place to learn C# online?
stackoverflow.com
6
Does ASP.NET MVC Framework support asynchronous page execution?
stackoverflow.com
5
How does TDD make refactoring easier?
stackoverflow.com