If you want to retrieve data(password ,UserID,DataSource,InitialCatalog) , you can use SqlConnectionStringBuilder (From .NET Framework 2.0, there is System.Data.Common.DbConnectionStringBuilder and its derived classes (SqlConnectionStringBuilder for SqlServer))
string connectionString = WebConfigurationManager.ConnectionStrings["MyConnectionString"].ConnectionString;
SqlConnectionStringBuilder builder = new SqlConnectionStringBuilder(connectionString);
string password = builder.Password;
string username = builder.UserID;
string dataSource = builder.DataSource;
string initialCatalog = builder.InitialCatalog;
Tags: asp.net, sqlconnectionstring