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 Read more about Indirect reference is being made to assembly System.Web.Extensions version 3.5.0.0[…]

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 Read more about Showing a modal dialog box or form when the application is not running in UserInteractive mode is not a valid operation[…]

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]

Unable to send to all recipients … Mailbox unavailable. The server response was: 5.7.1 Unable to relay for …

Managed to fix it by going to IIS > Default SMTP Virtual Server > Property > Access > Relay Even though I still not able to receive the mail I sent out yet, but there is no more error message when I use VB.NET code (System.Net.Mail.MailMessage) to send it. When I went to C:InetpubmailrootQueue, I Read more about Unable to send to all recipients … Mailbox unavailable. The server response was: 5.7.1 Unable to relay for …[…]

Error: Failure sending mail … Unable to connect to the remote server

During my development, I bound into this error. The short error message is “Failure sending mail”. The long one is Failure sending mail. —> System.Net.WebException: Unable to connect to the remote server —> System.Net.Sockets.SocketException: No connection could be made because the target machine actively refused it at System.Net.Sockets.Socket.DoConnect(EndPoint endPointSnapshot, SocketAddress socketAddress) I googled a bit Read more about Error: Failure sending mail … Unable to connect to the remote server[…]