is it neccessary to cast ado.net data provider data types to .net framework data types

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hi all
I need to know what is the real difference between these two code snippets
and which is better?

VB

'create the connection and command objects
do while r.read = true
  memberid = convert.toint32(r.item(0))
  membername = convert.tostring(r.item(1))

and this:

VB

'create the connection and command objects
do while r.read = true
  memberid = r.item(0)
  membername = r.item(1)

Posted 27-Apr-12 4:16am

cjoanson

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VJ Reddy · Answer 1 · 2012-04-27T04:38:00

The return type of Item property of SqlDataReader is Object as explained here http://msdn.microsoft.com/en-us/library/y64yaah2.aspx[^]

When a Visual Basic project is created in Visual Studio, by default the Option Strict is off, hence the implicit conversion from Object to String or Integer are allowed, hence, the second set of statements could be compiled.

If the Option Strict is turned on On (by right clicking on the project, selecting the properties menu option, and in the compile Tab of the property pages), then the second set of statements will not be compiled and the following error will be displayed

Option Strict On disallows implicit conversions from Object to String, Integer as case may be.

In C Sharp the Explicit cast is a must.
So, I think, it is preferable to use the first set of statements.