This post explores a few examples of how to use a filter, Where, with LINQ. Here are a few examples.

• Contains
• StartsWith
• Equals
• EndsWith

class Product
{
    public string Name { get; set; }
    public float Price { get; set; }
}
class ProductRepository
{
    public IEnumerable<Product> GetProducts()  // method
    {
        return new List<Product>
        {
            new Product() {Name = "P one", Price = 5},
            new Product() {Name = "P two", Price = 9.99f},
            new Product() {Name = "P three", Price = 12},
        };
    }
}
class Program
{
    static void Main(string[] args)
    {
        var products = new ProductRepository().GetProducts();
        var pricyProducts = new List<Product>();
        // ------without LINQ----------------------------
        foreach (var product in products)
        {
            if (product.Price > 10)
                pricyProducts.Add(product);
        }
        // ------without LINQ-----------------------------
        foreach (var product in pricyProducts)
           Console.WriteLine("{0} {1:C}",product.Name, product.Price);
    }
}

If we use LINQ we can replace the “without LINQ” commented code with the code below.

// -----with LINQ-------------------------------------------
var pricyProducts2 = products.Where(p => p.Price > 10);
// -----with LINQ-------------------------------------------