How to use Lambda expression wiht generic delegate, C#

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//Rextester.Program.Main is the entry point for your code. Don't change it.
//Compiler version 4.0.30319.17929 for Microsoft (R) .NET Framework 4.5

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text.RegularExpressions;

namespace Rextester
{
    public class Program
    {
        public static void Main(string[] args)
        {
            //Your code goes here
            
            
           
          
             var ProductLists = new List<Product>(){
                  new Product{Price=600m,Category="Soccer"},
                  new Product{Price=700m,Category="Electronics"},
                  new Product{Price=600m,Category="Soccer"}
        
        };
            //Defining the generic delegate
            Func<Product,bool> IsSoccerCategory=prod=>prod.Category=="Soccer";
        
        var getAllSoccer = ProductLists.Filter(IsSoccerCategory);
        
        var TotalPrice = getAllSoccer.Sum(p=>p.Price);
            Console.WriteLine("The total price for in the soccer is {0}",TotalPrice);
        }
        
       
    }
    
    public static class FilterCategory{
    
        public static IEnumerable<Product> Filter(this IEnumerable<Product> products,Func<Product,bool> selectParam){
            
            foreach(var prod in products)
            {
                if(selectParam(prod)){
                    yield return prod;
                
                }
            
            }
    }
   }
    
    public class Product{
    
        public decimal Price {get;set;}
        public string Category {get;set;}
    
    }
}

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Compilation time: 0,17 sec, absolute running time: 0,11 sec, cpu time: 0,11 sec, average memory usage: 14 Mb, average nr of threads: 3