How to search with the Contains method in a List if there are multiple columns of data?

Good afternoon, there is a List with several columns of data, here is an example

public static List<(double date, double profit)> data_good_proffit = 
  new List<(double date, double profit)>();

how to write to search using the Contains method in the Profit column?

data_good_proffit.Contains();

so writes an error

>Solution :

Contain will do if you want to find out the entire tuple, e.g.

// Do we have date == 5.0 and profit == 7.1?
bool result = data_good_proffit.Contains((5.0, 7.1));

If you want to check for profit only and ignore the date try to query with a help of Linq:

using System.Linq;

...

// Do we have any item with profit == 7.1?
bool result = data_good_proffit.Any(item => item.profit == 7.1);

please, not that you have a list of tuples, with no separate columns existing.