What is ref parameter?What is Out parameter?What's the difference between these two?

Sachin

• Aug 6th, 2007

 

Ref Parameter: Used to pass a parameter as a reference so that the function called will set the value. This could be used to return more than 1 value by a function.
e.g.

 public int AddMuliply( int a , int b, ref int c)
 {
  c = a*b;
  return ( a+b);
 }
 
The above function, returns the addition of two numbers as well as computes the multiplication result and passes to the calling function.

Out Parameter: Used to pass values from the aspx Code-behind to the aspx page.

Correct me if I am wrong.

Sachin

• Aug 6th, 2007

 

Oops...

The difference is that for a ref parameter, you have to assign a value before you call the function, while for OUT parameter, you dont have to assign a value, the calling function assumes that the called function would assign some value.

Kuldeep Shishodia

 Profile Answers by Kuldeep Shishodia 

• May 24th, 2010

 

Ref parameter are basically use to pass the variable as a reference to a function.

OUT Parameter are used to send back the result to a calling function.