DLLLL/Calculation.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 quantity = 0f;

            switch(productType)
            {
                case 1:
                    quantity = width * length * count * 1.1f;
                    break;
                case 2:
                    quantity = width * length * count * 2.5f;
                    break;
                case 3:
                    quantity = width * length * count * 8.43f;
                    break;
                default:
                    return -1;
                    break;
            }

            

            switch(materialType) 
            {
                case 1:
                    quantity = quantity * 1.003f;
                    break;
                case 2:
                    quantity = quantity * 1.0012f;
                    break;
                default:
                    return -1;
                    break;
            }

            return Convert.ToInt32(quantity);
        }
    }
}