Home > DeveloperSection > Interviews > What is the difference between ref & out parameters?

Posted on    November-09-2010 12:00 AM

 C# C# 
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Amit Singh

Total Post:565

Posted on    November-09-2010 1:00 AM

When we pass a parameter as ref to a method, the method refers to the same variable and changes made will affect 
the actual variable. even the variable passed as out parameter is same as ref parameter, but implementation in
c# is different,
Arguement passed as ref parameter must be initialized before it is passed to the method. But in case of out
parameter it is not necessary. But after a call to a method as out parameter it is necessary to initialize.
When to use out and ref parameter, out parameter is used when we want to return more than one value from a method.

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