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What is ASP ASP stands for Active Server Pages. Active Server Pages are HTML pages with embedded ASP scripts that are processed on the server before the page is sent to the user. ASP allows you to create dynamic database driven pages, a user can access data in a database, and interact with page objects such as Active X or Java components. How does ASP work When you type a URL in the Address Box or click on a web page you are asking the web server to send a file to your computer; if the file is standard HTML, then, when your web browser receives the web page it will look exactly the same as it did on the web server. However if an ASP file is sent to your computer from the web server, firstly, the server will run the HTML code; and then, run the ASP code. the ASP code could be the current date, or time; and other such information.
Thinkpad Converting ASP to ASP.NET
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Active Server Pages (ASPs) side scripts in addition to the usual mixture of text and HTML (Hypertext Markup Language) tags. To distinguish asp web pages from normal HTML pages, Active Server Pages are given the ".asp" extension.
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Desktop Computer Summary: This document begins with an examination of a
Notebooks typical data-driven ASP application and then discusses porting the ASP
Lenovo application to ASP.NET. (13 printed pages)
Hard Drive Objectives
Travelstar Running ASP and Microsoft ASP.NET on the same Web server
Gateway Examining a common ASP application
Laptop Parts Porting the ASP application to ASP.NET
Software Assumptions
Hard Drives The following should be true for you to get the most out of this document:
Electronics You are familiar with MicrosoftVisual Basicprogramming concepts and
Canon terms
Desktop Pc You are familiar with ASP
Desktop Computers Contents
Think Pad
Repair Running ASP and ASP.NET on
Data Recovery the Same Web Server
Cisco One of the first things you are likely to notice when working with ASP.NET is
Keyboard the new file extension: ASP.NET pages use .aspx, as opposed to the .asp
Monitor extension used with ASP. Additionally, when an ASP.NET page is requested, IIS
Desktop hands off the request to the aspnet_wp.exe process; ASP uses asp.dll.
Infosys ASP and ASP.NET can both be used on the same Web server. That is, a Web site
Refurbished Laptops or Web application within a site can contain both ASP.NET pages and ASP pages.
Wipro Because both ASP and ASP.NET pages can be accessed from the same Web server, you
Lap Top are not required to port your existing ASP pages over to ASP.NET-compatible
Refurbished pages. However, there are many advantages to porting your application from ASP
Memory to ASP.NET. Some of the biggest advantages include:
Intel Increased performance: Microsoft tests have shown that ASP.NET
As400 applications can handle two to three times the requests per second as classic
Averatec ASP applications.
Hardware Increased stability: Processes are closely monitored and managed by
Dual Xeon the ASP.NET run time, so that if one misbehaves (leaks, deadlocks), a new
Storage process can be created in its place, which helps keep your application
Seagate constantly available to handle requests.
Computer Sales Increased developer productivity: New features like server controls
Computer Hardware and event handling in ASP.NET help developers build applications more rapidly
Printers and in fewer lines of code. It is also easier than ever to separate code from
Technology HTML content.
Mainframe Unfortunately, porting existing ASP pages to ASP.NET pages is almost never as
Samsung easy as simply renaming the file extension from .asp to .aspx because, among
Computer Repair other factors, there are significant differences between Microsoft Visual Basic
Used Computers Scripting Edition (VBScript) and Visual Basic .NET. The good news is that most
Network of the needed changes are syntactical and automatic. Visual Basic .NET code that
Digital Cameras uses COM components (such as ADO or custom COM components you may have written)
Desktops can virtually be left as is; C# code, however, requires a bit of extra code to
Cognos work with COM components, which is beyond the scope of this document.
Hosting This document, which is divided into two sections, begins with an examination
Netfinity of a typical data-driven ASP application. In the later section, you'll look at
Internet porting this ASP application to ASP.NET.
Cheap Computer Note This document
Digital Camera focuses on porting an ASP application to ASP.NET with as few changes to the
Printer original ASP code as possible; it does not examine rebuilding an ASP application
Xseries from the ground up, using features new to ASP.NET.
Maxtor Examining a Sample ASP
Data Storage Application
Hitachi The sample ASP application that you will be porting to ASP.NET is a Project
Rational Report Application for a fictional company. The application is written in
Websphere VBScript. This typical application displays information about ongoing and past
Battery projects, allowing the user to specify certain requirements on the Project
It Support Report display.
Western Digital This ASP application is data-driven, as the project information is stored in
Music a database; specifically, two database tables are used: Project and Department.
Networks The Department table contains information about each department in the company
Toner and the Project table contains information about each project, such as: project
Cheap Laptops name, start date, estimated completion date, actual completion date, priority,
Wholesale the department in charge of the project (via a foreign key to the Department
Brother table), and a thorough project description.
Netvista A user browsing to the Project Information Web page is shown a listing of
Camera projects that were started in the past year. Two list boxes allow the user to
Networking customize the view of the current projects. The first list box lets the user
Sharp specify to view ongoing, completed, or all projects. (An ongoing project is one
Cheap whose completion date is NULL, and a completed project has an actual and past
Windows completion date.) The second list box permits the user to further customize the
Monitors report by viewing projects by a particular department.
Linux Figure 1 shows the project report user interface. In this instance, the user
Computer Support has opted to view all ongoing projects for the Internal Computer Services
Used Laptops department.
Cameras
Scanners Figure 1. A report of the Internal Computer Services
Panasonic Department's ongoing projects
Workstation Examining the Project Report Code
Iseries The source code for the entire Project Report application is encompassed
Backup within a single ASP page, which uses a postback form to handle the user's report
Information Technology customization options. Because this document focuses on porting an ASP
Routers application to ASP.NET, an explanation of how the ASP code works is not
180gxp included. It is assumed that you have a working knowledge of how ASP and ADO
Notebook Battery data access are used to build applications today.
Security The following code shows an ADO Connection object being created and opened to
Lotus a Microsoft Access database.Set objConn = Server.CreateObject("ADODB.Connection")
Virus objConn.ConnectionString = _
Thinkpad T42 "PROVIDER=Microsoft.Jet.OLEDB.4.0;DATA SOURCE=" & _
Thinkpad 600 Server.MapPath("Projects.mdb") & ";"
Thinkpad 600e objConn.Open
Thinkpad 570 A recordset is populated with the Name and DepartmentID for
Thinkpad 600x each row in the Department table. The contents of this recordset are then
Thinkpad 390x displayed in a list box.Set objDeptListRS = Server.CreateObject("ADODB.Recordset")
Thinkpad A31 objDepartmentListingRS.Open "Department", objConn, _
Thinkpad X20 adOpenForwardOnly, adLockReadOnly, adCmdTable
Bios Update
Laptops 'Iterate through the Recordset
Toshiba Response.Write "<b>Department:</b> " & _
Laptop Battery "<select size=""1"" name=""lstDepartmentID"">"
Thinkpad Response.Write "<option value=""-1"">" & _
Microsoft "-- Show All Departments --</option>" & vbCrLf
Laptop Computers Do While Not objDeptListRS.EOF
Laptop Computer Response.Write "<option value=""" & _
Desktop Computer objDepartmentListingRS("DepartmentID") & """"
Notebooks 'Do we need to make the item SELECTED?
Lenovo If CInt(objDepartmentListingRS("DepartmentID")) = _
Hard Drive CInt(iDepartmentID) then
Travelstar Response.Write " selected"
Gateway End If
Laptop Parts
Software Response.Write ">" & objDeptListRS("DepartmentName") &_
Hard Drives "</option>"
Electronics objDeptListRS.MoveNext
Canon Loop
Desktop Pc Response.Write "</select>" & vbCrLf & vbCrLf
Desktop Computers Next, a dynamic SQL query is constructed based on the options selected by the
Think Pad user. Note in the following code that the SQL query's WHERE clause is
Repair created so that it always retrieves only those projects that began in the
Data Recovery previous year. Based upon the user's selections, the WHERE clause is
Cisco potentially extended further. The variables iDepartmentID and
Keyboard strProjectView are variables defined earlier and assigned to the list box
Monitor values selected by the user.strSQL = "SELECT D.DepartmentName, ProjectName, " & _
Desktop "StartDate, EstimatedEndDate, ActualEndDate, " & _
Infosys "Priority, ProjectDescription " & _
Refurbished Laptops "FROM Project P " & _
Wipro "INNER JOIN Department D ON " & _
Lap Top "D.DepartmentID = P.DepartmentID " & _
Refurbished "WHERE StartDate >= #" & _
Memory DateAdd("yyyy", -1, Date()) & "# "
Intel 'Now, construct addition WHERE clauses if needed
As400 If CInt(iDepartmentID) <> -1 then
Averatec 'Add a clause for the department ID
Hardware strSQL = strSQL & " AND P.DepartmentID = " & _
Dual Xeon iDepartmentID
Storage End If
Seagate 'What types of projects do we want to view?
Computer Sales Select Case strProjectView
Computer Hardware Case "ongoing":
Printers strSQL = strSQL & " AND ActualEndDate IS NULL"
Technology Case "completed":
Mainframe strSQL = strSQL & " AND ActualEndDate IS NOT NULL"
Samsung End Select
Computer Repair Another Recordset object, objProjectsRS, is created and populated with
Used Computers the results of the above dynamic SQL query. Finally, this recordset is iterated
Network through and displayed as an HTML table.'Output the HTML table tag and th tags
Digital Cameras Response.Write "<p><table align=""center"" " & _
Desktops "border=""1"" cellspacing=""1"">" & vbCrLf
Cognos Response.Write "<tr><th>Project</th><th>StartDate</th>" &_
Hosting "<th>Estimated Completion</th><th>Actual " & _
Netfinity "Completion</th><th>Priority</th>" & _
Internet "<th>Description</th></tr>" & vbCrLf
Cheap Computer 'Loop through the entire Recordset
Digital Camera Do While Not objProjectsRS.EOF
Printer 'Display the Recordset information
Xseries objProjectsRS.MoveNext 'move to the next record
Maxtor Loop
Data Storage Response.Write "</table>" & vbCrLf & vbCrLf
Hitachi Porting the ASP Application
Rational to ASP.NET
Websphere When porting an ASP application to ASP.NET, you will need to decide how much
Battery time you want to spend incorporating the new features of ASP.NET into the
It Support existing ASP application. Changing an ASP page's file extension from .asp to
Western Digital .aspx and correcting for some syntactical changes is usually enough to get an
Music ASP page working as an ASP.NET page. Such a port, although it can be completed
Networks quickly, does not take advantage of many of the new features of .NET, including
Toner ASP.NET Web controls, Microsoft ADO.NET, the Microsoft .NET Framework classes,
Cheap Laptops etc. Although a more complete port may take more time, your finished ASP.NET
Wholesale pages will be readable and maintainable, and more feature-rich.
Brother As a developer, you need to weigh the tradeoffs when deciding what approach
Netvista to take when moving an ASP application to ASP.NET. If you are pressed for time,
Camera a simple port from ASP to ASP.NET may be in order; if no such deadline looms, it
Networking may be worthwhile to take the time to build a rich ASP.NET application from the
Sharp ground up. You can also, of course, take an incremental approach. If you ran a
Cheap large site that utilized a number of COM components to implement business rules,
Windows you may decide to port over just the UI portion of your Web application, and
Monitors continue to use the classic COM components.
Linux In this next section, you will examine porting the existing ASP code to
Computer Support ASP.NET, making as few modifications as possible.
Used Laptops Porting ASP Applications to ASP.NET
Cameras To port an existing ASP application to ASP.NET, the first step is to rename
Scanners the file extension of the ASP pages from .asp to .aspx. Because the Project
Panasonic Report Application has a single ASP page, this renaming task is simple enough.
Workstation Once you've made this change, take a moment to visit the new .aspx page through
Iseries your Web browser. Did it load without error? Most likely not; chances are your
Backup VBScript code contains some syntactical problems.
Information Technology When porting the ASP application we examined earlier, the first error message
Routers you will receive is an error concerning Option Explicit, as shown in Figure
180gxp 2.
Notebook Battery
Security Figure 2. Option Explicit statement error message
Lotus This statement, for an ASP.NET Web page, should be moved to the @Page
Virus directive. At this point, edit the .aspx file by removing lines 1 and 2 and
Thinkpad T42 replacing them with the following @Page directive:<% @Page Language="VB" Explicit="True" %>
Thinkpad 600 Once this change is made, reload the page in the browser. You will receive
Thinkpad 600e another error concerning the lack of parenthesis around the Response.Write
Thinkpad 570 statements.
Thinkpad 600x
Thinkpad 390x Figure 3. Response.Write statement error message
Thinkpad A31 This generates an error since Visual Basic .NET requires that all argument
Thinkpad X20 lists to both subroutines and functions be encased in parenthesis. Check through
Bios Update the entire document and place parenthesis around the argument lists for all of
Laptops the Response.Write statements, and then reload the ASP.NET page in your browser
Toshiba once again.
Laptop Battery Another change from Visual Basic 6.0/VBScript to Visual Basic .NET is that
Thinkpad Visual Basic .NET does not support default properties. Default properties
Microsoft allowed developers a bit of a shortcutf, when using classic COM components in
Laptop Computers Visual Basic 6/VBScript, a developer failed to specify a property, the default
Laptop Computer property is used. For example, the default property of the ADO Recordset is the
Desktop Computer Fields collection, and the default property of a Fields collection
Notebooks is the Value property. Hence, when you use:Response.Write objRecordset("columnName")
Lenovo in classic ASP you are saying, in essence:Response.Write objRecordset.Fields("columnName").Value
Hard Drive When porting your classic ASP pages to ASP.NET, you may receive the following
Travelstar cryptic error message, Cast from __ComObject to String is not
Gateway valid.
Laptop Parts
Software Figure 4. ASP.NET porting error message
Hard Drives Such an error occurs because Visual Basic .NET does not support default
Electronics properties, when we use:Response.Write(objRecordset("columnName"))
Canon Visual Basic .NET is trying to cast the Fields object to a String,
Desktop Pc which it cannot do. Rather, we must indicate that we want to output the
Desktop Computers Value property by explicitly stating which properties we wish to
Think Pad output:Response.Write(objRecordset.Fields("columnName").Value)
Repair As you continue to port your ASP.NET application you will, invariably, come
Data Recovery across other syntactical errors. Table 1 summarizes the syntactical errors
Cisco encountered when porting the Project Report Application from ASP to ASP.NET.
Keyboard Note Visual Basic has
Monitor matured as a programming language with the release of Visual Basic .NET. It now
Desktop supports tryatch error handling, true object-oriented development, and many
Infosys other enhancements that were long overdue. To modernize Visual Basic, though, it
Refurbished Laptops was necessary to make some syntactical changes to the language. Therefore,
Wipro Visual Basic .NET is not 100% backwards compatible with VBScript or Visual Basic
Lap Top 6. 0. For a detailed discussion on the changes in Visual Basic .NET, be sure to
Refurbished read .
Memory Table 1. Syntactical errors encountered when porting the
Intel Project Report Application
As400 Error
Averatec Reason
Hardware Resolution
Dual Xeon Option Explicit statement not valid inside a
Storage procedure.
Seagate Option Explicit needs to be defined in the Page
Computer Sales Directive using the Explicit attribute.
Computer Hardware Add <% @Page Explicit="True" %> to the
Printers top of the ASP.NET page.
Technology There can only be one Page Directive.
Mainframe When we added a Page Directive, the @LANGUAGE =
Samsung "VBSCRIPT" directive in our ASP page became redundant.
Computer Repair Remove the line containing <%@ LANGUAGE =
Used Computers "VBSCRIPT" %> and add the Language="VB" attribute to the Page
Network Directive.
Digital Cameras Argument lists in call statements must now be
Desktops enclosed in parenthesis.
Cognos Visual Basic .NET requires all subroutine calls to
Hosting enclose their parameters in parenthesis. A number of Response.Write statements
Netfinity do not contain such parenthesis.
Internet Add the needed parenthesis: e.g., change
Cheap Computer Response.Write str to Response.Write(str).
Digital Camera Let and Set statements are no longer supported on
Printer assignment statements.
Xseries Because Visual Basic .NET no longer supports default
Maxtor properties, the Let and Set keywords have been removed from the
Data Storage Visual Basic language.
Hitachi Remove any Let or Set keywords. (In the
Rational Project Report Application, the Set keyword assigns Connection and
Websphere Recordset objects to variables.)
Battery Date is a type, and so is not a valid expression. A
It Support variable, constant, or procedure is expected.
Western Digital In the Project Report Application the Date()
Music function was used to get the current date. This is no longer supported.
Networks Replace Date() with
Toner DateTime.Now
Cheap Laptops The name IsNull is not declared.
Wholesale Visual Basic .NET no longer supports the
Brother IsNull function. (Recall that in the Project Report Application, a
Netvista project is not completed if the actual completion date is NULL; in the ASP
Camera version IsNull is used to check whether or not the field was NULL.)
Networking To fix, replace IsNull with
Sharp IsDBNull.
Cheap Cast from __ComObject to String is not valid.
Windows Visual Basic .NET no longer supports default
Monitors properties, so when using classic COM components, be certain to explicitly fully
Linux state the properties you wish to use.
Computer Support Change instance of objRS("colName") to
Used Laptops objRS.Fields("colName").Value
Cameras COM Component Threading Concerns
Scanners Some issues can arise when using COM components within an ASP.NET page,
Panasonic specifically those COM components that have been marked as apartment-threaded or
Workstation COM objects that access the ASP-intrinsic objects (Request,
Iseries Response, Server, Application, and Session) through
Backup the ObjectContext object.
Information Technology For example, by default, the ADO objects are marked in the registry as
Routers apartment-threaded; when trying to use an apartment-threaded component through
180gxp an ASP.NET page, you will receive an error instructing you that the
Notebook Battery apartment-threaded component you attempted to create could not be created.
Security Figure 5 shows the ASP.NET port of the Project Report Application. Note that
Lotus this error is present because the ADO objects are, by default, marked as
Virus apartment-threaded.
Thinkpad T42
Thinkpad 600 Figure 5. An error occurs when attempting to access an
Thinkpad 600e apartment-threaded COM component through an ASP.NET page
Thinkpad 570 Fortunately, ASP.NET offers an ASP Compatibility mode, as the error message
Thinkpad 600x says. To turn on the ASP Compatibility mode, add the aspcompat=true
Thinkpad 390x attribute to the Page Directive. Adding this attribute accomplishes two things:
Thinkpad A31 ASP.NET uses Single-Threaded Apartment (STA) threads when accessing the COM
Thinkpad X20 component. The default is to use Multi-Threaded Apartment, or MTA, threading.
Bios Update ASP.NET provides access to the ASP-intrinsic objects in a
Laptops backward-compatible fashion.
Toshiba With these two changes, the ASP Compatibility mode allows ASP.NET to use
Laptop Battery apartment-threaded COM components or COM components that access the
Thinkpad ASP-intrinsic objects.
Microsoft Note A
Laptop Computers thorough discussion on the COM threading models is beyond the scope of this
Laptop Computer document. For more information on the various COM threading models and their
Desktop Computer implications, be sure to read Understanding and Using COM Threading Models.
Notebooks Summary
Lenovo You have now examined how to port an ASP application to ASP.NET. As you can
Hard Drive see, porting an ASP page involves not much more work than simply renaming the
Travelstar page's file extension. Porting the Project Report Application from ASP to
Gateway ASP.NET, a one-page ASP application with 200 lines of code, took under five
Laptop Parts minutes. When porting your ASP applications to ASP.NET, be sure to keep the
Software following points in mind:
Hard Drives Be familiar with the syntactical changes from VBScript to Visual Basic .NET.
Electronics Guarding against small syntactical errors will make the process that much
Canon smoother.
Desktop Pc Add the aspcompat="true" attribute to the Page Directive if the ASP
Desktop Computers page you are porting uses apartment-threaded COM components or COM components
Think Pad that access the ASP-intrinsic objects. Otherwise this directive is not required.
Repair About the Author
Data Recovery Scott Mitchell is the founder and editor of , one of the
Cisco largest ASP resource sites on the Web. He has been avidly using and writing
Keyboard about Active Server Pages since January 1998. Scott has written several hundred
Monitor ASP and ASP.NET-related articles on 4Guys, along with authoring numerous
Desktop beginner- and advanced-level books on Active Server Pages and ASP.NET.
Infosys About Informant Communications Group
Refurbished Laptops Informant Communications Group, Inc. is a diversified media company focused
Wipro on the information technology sector. Specializing in software development
Lap Top publications, conferences, catalog publishing and Web sites, ICG was founded in
Refurbished 1990. With offices in the United States and the United Kingdom, ICG has served
Memory as a respected media and marketing content integrator, satisfying the burgeoning
Intel appetite of IT professionals for quality technical information.
As400 Copyright by Group and Microsoft Corporation
Averatec Technical editing: Paul Litwin, Litwin Consulting
Hardware
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