Unknown server tag ‘ajaxToolkit:CalendarExtender’

When I launched our company’s Intranet this morning, the following Exception was loaded:

Unknown server tag ‘ajaxToolkit:CalendarExtender’

Locally on the development machine everything worked fine, but on the server it just didn’t want to work. I searched though the net to find solutions and found many who would work normally but in my case, didn’t work for me. The solutions include: Continue reading

Theme cannot be found in the application or global theme directories

I was creating an application and everything was working fine. But when i uploaded the website on the server the following exception loaded…

Theme ‘Default’ cannot be found in the application or global theme directories

There are two ways to solve this problem: Continue reading

There is already an open DataReader…

Sometimes, when I try to get data from the SQL Server the following exception is loaded:

“There is already an open DataReader associated with this Command which must be closed first.”

This occurs when you have multiple DataReaders open concurrently on the same connection, ie you call SqlCommand.ExecuteReader but don’t close the SqlDataReader returned by this method before calling it again (either on the same command or another command on the same connection).

This is due to a change in the default setting for MARs (Multiple Active Result Sets).  By default, It used to be set as True but it was changed and was set to False by default post RC1.

So to remove this exception, you just need to change the following: Continue reading