using System.Data.SqlClient; public DataTable GetEmployees() { string connectionString = "Data Source=database_server;Initial Catalog=my_data;User ID=username;Password=password;"; string query = "SELECT * FROM Employees"; using(SqlConnection connection = new SqlConnection(connectionString)) { using(SqlCommand command = new SqlCommand(query, connection)) { connection.Open(); SqlDataReader reader = command.ExecuteReader(); DataTable dataTable = new DataTable(); dataTable.Load(reader); return dataTable; } } }In this example, we first define a connection string that specifies the database server, the database name, and the login credentials. We then define the SQL query to retrieve all employees from the Employees table. We then create a SqlConnection object and a SqlCommand object, passing in the connection string and the query, respectively. We then open the connection, execute the query using the ExecuteReader method, and load the resulting data into a DataTable object. The package library that includes Query ObtenerDataTable is System.Data.SqlClient.