A Connection String is a string that specifies information about a particular data source and how to go about connecting to it by storing credentials, locations, and other information.
Typically, a connection string will be stored within a configuration file (such as an
web.config within ASP.NET applications). The following is an example of what a local connection might look like within one of these files :
<connectionStrings> <add name="WidgetsContext" providerName="System.Data.SqlClient" connectionString="Server=.\SQLEXPRESS;Database=Widgets;Integrated Security=True;"/> </connectionStrings> <connectionStrings> <add name="WidgetsContext" providerName="System.Data.SqlClient" connectionString="Server=.\SQLEXPRESS;Database=Widgets;Integrated Security=SSPI;"/> </connectionStrings>
This will allow your application to access the connection string programatically through
WidgetsContext. Although both
Integrated Security=SSPI and
Integrated Security=True perform the same function;
Integrated Security=SSPI is preferred since works with both SQLClient & OleDB provider where as
Integrated Security=true throws an exception when used with the OleDb provider.
Each data provider (SQL Server, MySQL, Azure, etc.) all feature their own flavor of syntax for their connection strings and expose different available properties. ConnectionStrings.com is an incredibly useful resource if you are unsure about what yours should look like.