ASP.NET 2.0: A Developeramp;#039;s Notebook [Electronic resources] نسخه متنی

1.2. Use Multiple Languages

Unlike ASP.NET 1.x, which requires that
you use the same language throughout a web application, ASP.NET 2.0
lets you vary your languages from page to page within a project.

Note: You're no longer restricted to using a
single language for your web applications.
Tip: While support for multiple languages is a useful feature, developers
should use it in moderation (and only if necessary). Going with
multiple languages in a single project is likely to increase the
effort required in maintaining the project, particularly if the
application ends up being maintained by someone
who's not familiar with all the languages used.

Figure 1-7 shows a project with three pages, each
of which is programmed with a different language: VB.NET
(Default.aspx), C#
(Default2.aspx), or VJ#
(Default3.aspx).

Tip: VJ# does not support code-behind pages, so none appear for
Page3.aspx in the Solution Explorer window.

Figure 1-7. A project with pages using different languages

1.2.1. How do I do that?

To verify that you can really mix languages in an ASP.NET 2.0 web
application, in this lab you will create an application that uses two
languages: VB.NET and C#.

Using the project created in the last lab, add a new Web Form by
right-clicking the project name in Solution Explorer and then
selecting Add New Item.... Select Web Form from the list of installed
templates.

In the Add New Item dialog, you can
choose the language you want to use, as shown in Figure 1-8. ASP.NET 2.0 supports three languages: VB2005,
C#, and VJ#. Use the default name of
Default2.aspx and choose the C# language. Click
Add.

Figure 1-8. Choosing the language to use

In the Code View of Default.aspx, code the
following:

Protected Sub Page_Load(ByVal sender As Object, _
ByVal e As System.EventArgs) _
Handles Me.Load
Page.Title = "Page written in Visual Basic"
End Sub

In the Code View of Default2.aspx, code the
following:

void Page_Load(object sender, EventArgs e)
{
Page.Title = "Page written in C#";
}

To test the application, select Default.aspx in
Solution Explorer and press F5. In IE, note the title of the window.
Now, change the URL to load Default2.aspx. Figure 1-9 shows the effect of loading the two forms.

Figure 1-9. Loading two forms in an application written in two different languages

1.2.2. What about...

...using other .NET-supported languages such as
C++, Python, or
Perl?

Visual Studio 2005 will support only VB2005, C#, and VJ# for web
development. The other languages are, however, available for other
types of non-web projects.

1.2.3. Where can I learn more?

There is a good discussion on mixing languages in a .NET project at
http://weblogs.asp.net/dreilly/archive/2003/05/17/7164.aspx.
So before you go ahead and write your next ASP.NET web application
using both VB.NET and C# (or J#), check out what other developers
have to say.