تکلیف جلسه 34 (محاسبه BMI)

namespace BMI_Calculator.Repository
{
    internal interface IRepository
    {
        string BMI(string Weight, string Height);
    }
}

using BMI_Calculator.Repository;

namespace BMI_Calculator.Services
{
    internal class Myrepository : IRepository
    {
        public string BMI(string Weight, string Height)
        {
            decimal dWeight = Convert.ToDecimal(Weight);
            decimal dHeight = Convert.ToDecimal(Height);
            decimal BMI = dWeight / (dHeight * dHeight);
            return BMI.ToString("0.00");
        }
    }
}
namespace BMI_Calculator
{
    public partial class Form1 : Form
    {
        IRepository repo;
        public Form1()
        {
            InitializeComponent();
            repo = new Myrepository();
        }

        private void btnCalculate_Click(object sender, EventArgs e)
        {
            if (IsValid())
            {
                decimal dWeight = Convert.ToDecimal(numWeight.Value);
                decimal dHeight = Convert.ToDecimal(numHeight.Value);
                dHeight /= 100;
                string result = repo.BMI(dWeight.ToString(), dHeight.ToString());
                lblDisplayer.Text = result;

            }
        }
        public bool IsValid()
        {
            if (numHeight.Value > 273 || numHeight.Value < 54)
            {
                MessageBox.Show("Enter a Real Height in cm", "Error", MessageBoxButtons.OK, MessageBoxIcon.Error);
                return false;
            }
            else if (numWeight.Value > 635 || numWeight.Value < 2)
            {
                MessageBox.Show("Enter a Real Weight in kg", "Error", MessageBoxButtons.OK, MessageBoxIcon.Error);
                return false;
            }
            else
            {
                return true;
            }
        }
    }
}