all we know the structure is value type and class is reference type.suppose i have declare structure
with three datamember like employee_id type integer,employee_name type string,employee_salary type integer.
and we know the string is reference type so please tell me what will actually happen when structure will
have one or two reference type data member.

When you pass a value type to a method/function a copies of the values are actually passed. When you pass a reference type only the address of the reference type is passed, this means that the original values are made available to the calling function.

In this case the structure still holds a reference to the string object, so a copy of the address is passed to the calling function and the original string object is made available for manipulation.

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BrainBench ADO.NET and ASP.NET Certified Developer

Hi

Can you please give any code example for ByVal and Byref.

by

Chris

Code example.... Lets say you have this code in some subroutine:

Dim x as int16

    x=10
    changevalue x
    msgbox x


private sub changevalue(y as int16)
    y=20
end sub


If you run this code, changing value of y variable will not affect x variable's value, cause copy of argument is passed to procedure (default in VB.NET is byval, which is opposite to VB6, where byref is default). If you add byref in front of y asrgument, then procedure takes the actual address of variable, and any change to y also affects x, so x value will be 20.

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