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

4.33 (6 votes)

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.

You might also like...

Date Posted:
Last Updated:
Posted by:
Total Views to date: 19101

1 Comment

- syam

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

Recent Comments

Obinna Okafor 26/05/2017 16:16
In response to Razor Pages - The Elevator Pitch
Thank you for this wonderful piece, Mike. I need more of these...Keep them coming - anything more...

Cyrus 26/05/2017 06:00
In response to Razor Pages - The Elevator Pitch
There are some concern about razor pages performance. Is it faster or slower than MVC? would you a a...

Cyrus 26/05/2017 05:44
In response to Razor Pages - Understanding Handler Methods
well done, thank you....

Satyabrata Mohapatra 23/05/2017 11:41
In response to Razor Pages - Understanding Handler Methods
Nice and easy !! Great post....

Cyrus 16/05/2017 19:55
In response to Razor Pages - Getting Started With The Preview
There is something wrong related to microsoft.dotnetcore.mvc.taghelpers! if you remove it from page...

Cyrus 16/05/2017 10:18
In response to Razor Pages - Getting Started With The Preview
well done mike, it was very useful, I really appreciate that....

Satyabrata Mohapatra 16/05/2017 07:21
In response to Razor Pages - Getting Started With The Preview
Finally!!!! web pages in asp.net core!!! Super excited !!!! Thank u sir for sharing.....Awaiting on...

Daniele 14/03/2017 10:24
In response to Working With Zip Files In ASP.NET MVC
is it possible give to the user a progress bar of the zipping process? Thanks in advance. ...

Suraj 13/03/2017 22:20
In response to Working With Zip Files In ASP.NET MVC
Very nice article. Thanks....

Satyabrata Mohapatra 19/02/2017 03:01
In response to Free SSL Certificates On IIS With LetsEncrypt
Thanks for sharing. Learned a lot !!...