The entry has already been added

c# asp.net asp.net-mvc connection-string webmatrix

After the <providers> and before the first <add....> node, add a <clear /> node. That will fix it!!

Or it can be in web.config that is parent to this one. Just add the below code before you add it again.

<remove name="DefaultConnection" />

Alternatively, clear all connection strings using

<clear />

I would suggest you rename DefaultConnection to something else like MyAppServices.

CodeHunter