static void Main(string[] args)
{
    string _connectionString = ("server=vrsbase-w2k3;" +
                                "database=express;" +
                                "user=sa;" +
                                "password=");

    string _sql = string.Empty;

    SqlConnection conn = null;

    // 2. Create and open a connection object

    conn = new SqlConnection(_connectionString);

    // 3. Open the Connection

    conn.Open();


    for (int x = 1; x <= 50000; x++)
    {
        _sql =
            string.Format(
                @"INSERT INTO dbo.airway (number, name) VALUES ('{0}', 'Bobby Lee');", x);

        SqlCommand command = new SqlCommand(_sql, conn);

        string returnvalue = (string) command.ExecuteScalar();

        Console.WriteLine(string.Format("Writting record {0} -> Value ({1})", x, returnvalue));
    }
    conn.Close();
}