using System.Data.SqlClient; // create connection string string connectionString = "Data Source=ServerName;Initial Catalog=databaseName;User ID=userName;Password=password"; // create connection object using (SqlConnection connection = new SqlConnection(connectionString)) { // create command to retrieve data SqlCommand command = new SqlCommand("SELECT * FROM tableName", connection); // create data adapter to fill data set SqlDataAdapter adapter = new SqlDataAdapter(command); DataSet dataSet = new DataSet(); // fill data set with data adapter adapter.Fill(dataSet); // manipulate data in memory DataTable table = dataSet.Tables[0]; foreach (DataRow row in table.Rows) { // do something with the data } }In this example, we create a disconnected approach to retrieve data from a database using a data adapter and then manipulate the data in memory using a data table. Package library for Disconnected approach in C#: The `System.Data.SqlClient` package is used in this example to access SQL Server databases, but other packages such as `System.Data.OleDb` can be used for other database systems.