Enterprise library 4 dataconfiguration tag - asp.net

Question

I am using Enterprise library for my data access.
When I am running the application, at the CreateDatabase() statement I am getting this exception:
Microsoft.Practices.ObjectBuilder2.BuildFailedException
was unhandled by user code
Message="The current build operation
(build key Build
Key[Microsoft.Practices.EnterpriseLibrary.Data.Database,
null]) failed:
The value can not be null or an empty string.
(Strategy type Microsoft.Practices.EnterpriseLibrary.Common.Configuration.ObjectBuilder.ConfiguredObjectStrategy,
index 2)"
Source="Microsoft.Practices.ObjectBuilder2"
Now, I googled a bit and I found that I have to place
<dataConfiguration defaultDatabase="LocalSqlServer"/>
but I don't know where. Is it the right solution?
Also, at the time of installing enterprise library I didn't see any connection string statement? So, I wonder how it will take the connection string from web.config file.
In the connection string section of my web.config file I have:
<remove name="LocalSqlServer"/>
<add name="LocalSqlServer" connectionString="Data Source=MSTR;Initial Catalog=USERDb;Integrated Security=true;" providerName="System.Data.SqlClient"/>

Answer 1

Yes you need to add the dataConfiguration section to the web.config.
First you need to add dataConfiguration to the list of ConfigurationSections in your web.config:
<configSections>
<section name="dataConfiguration" type="Microsoft.Practices.EnterpriseLibrary.Data.Configuration.DatabaseSettings, Microsoft.Practices.EnterpriseLibrary.Data, Version=4.1.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35"/>
</configSections>
Then you need to add your connection strings to the web.config (you've already done this):
<connectionStrings>
<add name="LocalSqlServer" connectionString="Data Source=MSTR;Initial Catalog=USERDb;Integrated Security=true;" providerName="System.Data.SqlClient"/>
</connectionStrings>
Then you need to add the actual dataConfiguration section to the web.config:
<dataConfiguration defaultDatabase="LocalSqlServer"/>
You can also use the Enterprise Library Configuration Tool to do this for you as well.