Indirect reference is being made to assembly System.Web.Extensions version 3.5.0.0

The full error message is:

Error 1 Indirect reference is being made to assembly System.Web.Extensions version 3.5.0.0, which contains ‘AjaxControlToolkit.CalendarExtender’. This Project references a prior version of System.Web.Extensions version 1.0.61025.0. To use ‘AjaxControlToolkit.CalendarExtender’, you must replace the reference to System.Web.Extensions with version 3.5.0.0 or higher.

After some time finding for the cause, I realize that this is due to the me using the newer version of AjaxControlToolkit.dll. I should use the older version AjaxControlToolkit.dll for my ASP.NET 2.0 development.

Showing a modal dialog box or form when the application is not running in UserInteractive mode is not a valid operation

The full error message is

“Showing a modal dialog box or form when the application is not running in UserInteractive mode is not a valid operation. Specify the ServiceNotification or DefaultDesktopOnly style to display a notification from a service application.”

This is probably due to you using MsgBox(“so message here.”) for your web application. I learn that you can only use MsgBox for window form application.

So, the solution is to think of other way to display a message to the user.

Hide your source code at the browser when hit error

I got a little anxious and embarrassed to see my source code exposed at the browser when I got an error.

Managed to find out that this is due to some setting at the web.config. I just need to set debug to false.

[sourcecode language=”html”]
<configuration>
<system.web>
<compilation debug=”false” />
</system.web>
</configuration>
[/sourcecode]