WSUniversalLib_groshevIlya/WSUniversalLib/Class1.cs

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace WSUniversalLib
{
    public class Calculation
    {
        public static int GetQuantityForProduct(int productType, int materialType, int count, float width, float length)
        {
            float coef;
            if (productType == 1) { coef = 1.1f; }
            else if (productType == 2) { coef = 2.5f; } 
            else if (productType == 3) { coef = 8.43f; }
            else { return -1; }
            float square = width * length;
            float rez = square * coef;
            if (materialType == 1) { rez += rez * 0.003f; }
            else if (materialType == 2) { rez += rez * 0.0012f; }
            else { return -1; }
            return (int)Math.Round(Convert.ToDouble(rez) * count);
        }
    }
}