The code below will be in your web.config
<connectionStrings>
<add name="ConnectionStringName" connectionString="Provider=Microsoft.Jet.OLEDB.4.0;Data Source=|DataDirectory|DatabaseName.mdb;Persist Security Info=True" providerName="System.Data.OleDb"/>
</connectionStrings>
Now below this is how you will use your ConnectionString name in your class or code behind a page
public string dbConnection()
{
string connString = ConfigurationManager.ConnectionStrings["ConnectionStringName"].ConnectionString;
try
{
dbConn = new OleDbConnection(connString);
dbConn.Open();
}
catch (OleDbException exp)
{
MessageBox.Show(exp.Message);
}
return connString;
}
maybe u will need the following namespace
using System.Configuration;
Hope it helps...