test1/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 int GetQuantityForProduct(int productType,int materialType,int count,float width,float length)
        {
            double prType=0;
            if (productType == 1) prType = 1.1;
            if (productType == 2) prType = 2.5;
            if (productType == 3) prType = 8.43;

            double mType=0;
            if (productType == 1) mType = 1.003;
            if (productType == 2) mType = 2.0012;
            return Convert.ToInt32(width * length * count * prType * mType);
        }
    }
}