// sync
Product produto;
using (var connection = new SqlConnection(configuration.GetConnectionString("DefaultConnection")))
{
    produto = connection.QuerySingle<Product>(@"SELECT * FROM Products WHERE ProductID = @Id", param: new { id = -2 });
}
// async
Product produto;
using (var connection = new SqlConnection(configuration.GetConnectionString("DefaultConnection")))
{
    produto = await connection.QuerySingleAsync<Product>(@"SELECT * FROM Products WHERE ProductID = @Id", new { id = 2 });
}