connection-string

We've been using Entity framework in a production environment for many months now, and just yesterday started to get errors on some machines when querying the database using our subclass of DbContext: "The connection string 'MyConnectionString' in the application's configuration file does not contain the required providerName attribute" Our problem is easily solved: I adding the "providerName="System.Data.SqlClient" to the connection string in the config files on all deployed servers and workstations. However, the mystery remains: according to the documentation : The providerName attribute is

I've got an SQL Server CE database in a project that I wan't to store somewhere in the %AppData% directory. However I can't find a way to make a reference to the Application Data path in the connection string (in the App.Config) <?xml version="1.0"?> <configuration> <configSections> </configSections> <connectionStrings> <add name="EntityConnectionString" connectionString="metadata=res://*/EntityModel.csdl|res://*/EntityModel.ssdl|res://*/EntityModel.msl;provider=System.Data.SqlServerCe.3.5;provider connection string="Data Source=|ApplicationData|\Entities.sdf"" providerName="System.Data

I am currently reading Manning's "ASP.NET MVC 4 in Action" book and trying to get the first example to work. Within my test application, I built a simple Model and created some Views. I then imported "SQL Server Compact" using NuGet. When I finally try to run the application I get the following error: Invalid value for key 'attachdbfilename' This occurs on every interaction with the Database (SELECT or other CRUD operations) I am running. Any ideas? Though, I am bit late to respond to this question but I was facing the same issue and I resolved it by modifying the connection string like below

Wanting to deploy my project on different servers I would prefer to be able to specify a connect string using a relative path. I can't seem to get that to work and want to know if there is some trick to it...? AJ. A suggestion You could build the absolute path in the app and pass that in the connection string. So, if you know that the database file is in the database subfolder of the application folder, you could do something like this (C#): string relativePath = @"database\myfile.s3db"; string currentPath; string absolutePath; string connectionString; currentPath = System.Reflection.Assembly