Unable to connect to wpf application using SQLEXPRESS 2012

Question

Hi,
I am currently working on WPF project that uses SQLEXPRESS 2012 DB and EF 5.0. 
I was able to connect to the DB when it was hosted on the same PC. I now hosted the DB to a differernt PC and trying to access it through WPF app, but getting the error as "The underlying provider failed to open". I went through various forums
to fix the issue but none of the solutions provided resolved the issue. Below is my connection string
 <add name="SAPActivityContext" connectionString="metadata=res://*/SapEntity.csdl|res://*/SapEntity.ssdl|res://*/SapEntity.msl;provider=System.Data.SqlClient;provider connection string=&quot;data source=192.168.0.100\SQLEXPRESS;initial
catalog=Sap;persist security info=True;user id=sa;password=Pass@word7;MultipleActiveResultSets=True;&quot;" providerName="System.Data.EntityClient" />
The connection string has been refactored based on the various inputs provided in different forums.
Please help.

Answer 1

Hi Priyankaks,
According  your description, you fail to connect to a SQL Server 2012 Express database from WPF application. Cloud you please post the full error message for further analysis? You can check Windows Event Viewer or SQL Server Error log to see
if there is additional information.
From my knowledge, the error “The underlying provider failed on Open” always occurs when the connection string is incorrect. I recommend you create a surely working connection string via the following method.
Create a new project, add your Entity Framework Data Model and select your required connection, click “Test Connection” to get a working connection string. Then copy and paste the connection string in the web/app.config of your own project. For more
details, please review this similar
thread.
There is also a blog about error “The underlying provider failed on Open“in Entity Framework application
for your reference.
http://blogs.msdn.com/b/dataaccesstechnologies/archive/2012/08/09/error-quot-the-underlying-provider-failed-on-open-quot-in-entity-framework-application.aspx
Thanks,
Lydia Zhang