Migrating from Classic ASP to ASP.NET - equivalent objects and classes

Having spent some time familiarising oneself with the objects available in Classic ASP, it can be tricky sometimes to find the .NET framework equivalent. Here's a guide.
Classic ASP .NET Framework
Scripting.FileSystem System.IO
MSXML3.ServerXmlHttp System.Net.HttpWebRequest
CDO System.Net.Mail
Scripting.Dictionary System.Collections
ADODB.Connection[1] System.Data.SqlClient.SqlConnection
System.Data.OleDb.OleDbConnection
System.Data.Odbc.OdbcConnection
ADODB.Command[2] System.Data.SqlClient.SqlCommand
System.Data.OleDb.OleDbCommand
System.Data.Odbc.OdbcCommand
ADODB.RecordSet[3] System.Data.DataSet
System.Data.DataTable
System.Data.DataReader
rs.NextRecordSet[4] DataSet.DataTables(1)
DataReader.NextResult
Command.Execute[5] Command.ExecuteScalar
Command.ExecuteReader
Command.ExecuteNonQuery
Scripting.TextStream System.IO.SteamWriter
Response[6] HttpContext.Current.Response
Request HttpContext.Current.Request
Application HttpContext.Current.Application
Session HttpContext.Current.Session

[1] In ADO.NET, the Connection object is provider specific, unlike the generic ADO Connection object
[2] In ADO.NET, the Command object is provider specific, unlike the generic ADO Command object
[3] There is no real equivalent to a RecordSet object in ADO.NET. The DataSet is a disconnected in-memory container for data, which is held in DataTables. The DataReader is akin to a forward-only, read-only RecordSet.
[4] Methods and collection of the Response, Request, Session, Application etc objects can be referenced in ASP.NET in exactly the same way as in Classic ASP, where the reference is within the web form derived from Page. If the flow of control leaves this area, the static property Current on the HttpContext class can be used. This can be seen where the current page's querystring values are referenced from a static method in this nugget of code for paging articles.
[5] ExecuteScalar returns a one row, one column result. Usually used with aggregates like SELECT Count(ID) AS TheCount. ExecuteReader is used to return a DataReader containing the records to be processed. ExecuteNonQuery is used for INSERT, UPDATE and DELETE operations where no return value is expected.
[6] Multiple RecordSets returned in a DataSet occupy separate DataTables. The DataTables can be iterated over using their ordinal index. The DataReader offers a NextResult method which moves to the, well, next result.

Date Posted: Saturday, April 7, 2007 10:01 AM
Last Updated: Sunday, May 27, 2007 9:21 PM
Posted by: Mikesdotnetting
Total Views to date: 16322

1 Comment

Thursday, May 20, 2010 1:12 PM - syam

Good work. Very usefull information for .net beginner who knows classic ASP like me. Thank you.
Add your comment

If you have any comments to make about this article, please use this form to do so. Make sure that your comment relates specifically to the article above. More general comments can be posted through the form on the Contact page.

Please note, all comments are moderated, and some may not be published. The kind of things that will ensure your comment is deleted without ever seeing the light of day are as follows:

  • Not relevant to the article
  • Gratuitous links to your own site or product
  • Anything abusive or libellous
  • Spam
  • Anything in a language I don't understand including gibberish.

I do not pass email addresses on to spammers, so a valid one will assist me in responding to you personally if required.

Recent Comments

Gautam 11/20/2014 8:01 AM
In response to I'm Writing A Book On WebMatrix
Hello Mike, I read your book, loved it! However, I have a few request/suggestions: 1) an example...

Bret Dev 11/19/2014 8:39 PM
In response to The Difference Between @Helpers and @Functions In WebMatrix
Excellent post! One concern - where can you place global @Functions code within an MVC project to Is...

Rob Farquharson 11/19/2014 4:28 PM
In response to iTextSharp - Links and Bookmarks
How can I place text at an absolute position on the page? Also, how can I rotate text?...

Andy 11/17/2014 8:08 PM
In response to MVC 5 with EF 6 in Visual Basic - Sorting, Filtering and Paging
Hello I'm testing your sorting instructions above. This is great and I was able to get it to work...

Gautam 11/17/2014 5:51 PM
In response to WebMatrix - Database Helpers for IN Clauses
Hi Mike, I am very new to programming: In the above example if I want to use a delete button the...

donramon 11/17/2014 3:22 PM
In response to Entity Framework 6 Recipe - Alphabetical Paging In ASP.NET MVC
Congratulations on your new website look and the excellent articles. Thank you!...

Gautam 11/17/2014 11:26 AM
In response to Looking At The WebMatrix WebGrid
Hi Mike, I add the jquery script at the end of my html file.. when ajax attribute is added to the be...

Chet Ripley 11/15/2014 6:57 PM
In response to Adding A New Field
It appears the command is case sensitive. I had the same issue as Cameron. When I changed the to it...

Alvin 11/14/2014 12:49 PM
In response to Razor Web Pages E-Commerce - Adding A Shopping Cart To The Bakery Template Site
Great article Mike! When do you plan to extend the bakery shopping cart beyond this point?...

Gautam 11/14/2014 10:16 AM
In response to Web Pages - Efficient Paging Without The WebGrid
to get the count can we use only the below sql, why to join category and author table var sql =...