Add reference of Oracle database client library.
Right click on “Add Reference” inside your project.
From Add Reference dialog box click on “.Net” tab
Select “System.Data.OracleClient” from Component Name
Click “OK” button to add reference.
In web.config file
<connectionStrings>
<add name="ConnectionString" connectionString="Data Source=XE;User ID=system;Password=xyz;Persist Security Info=True;Connection Lifetime=10" providerName="System.Data.OracleClient"></add>
</connectionStrings>
call it in webpage
string strConnString = ConfigurationManager.ConnectionStrings["ConnectionString"].ConnectionString;
Also refer
http://www.connectionstrings.com/oracle/
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