C# Body Mass Index

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Forms;
 
namespace BMI
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }
 
 
 
        private void button2_Click(object sender, EventArgs e)
        {
            Form2 frm = new Form2();
            frm.ShowDialog();
 
        }
 
        private void button1_Click(object sender, EventArgs e)
        {
            double bmi = 0, gewicht = 0, groesse = 0;
            if (textBox1.TextLength > 0 && textBox2.Text.Length > 0)
            {
                gewicht = float.Parse(textBox1.Text);
                groesse = float.Parse(textBox2.Text);
                groesse = groesse / 100;
                bmi = gewicht / Math.Pow(groesse, 2);
                bmi = Math.Round(bmi, 2);
                Console.WriteLine(bmi);
                textBox3.Text = bmi.ToString();
                if (radioButton1.Checked)      //weiblich
                {
                    if (bmi >= 40)
                        label5.Text = "Sie haben starke Adipositas!";
                    else if (bmi >= 31)
                        label5.Text = "Sie haben Adipositas!";
                    else if (bmi >= 25)
                        label5.Text = "Sie haben Übergewicht!";
                    else if (bmi >= 19)
                        label5.Text = "Sie haben Normalgewicht!";
                    else if (bmi < 19)
                        label5.Text = "Sie haben Untergewicht!";
                }
                else if (radioButton2.Checked)           //männlich
                {
                    if (bmi >= 40)
                        label5.Text = "Sie haben starke Adipositas!";
                    else if (bmi >= 31)
                        label5.Text = "Sie haben Adipositas!";
                    else if (bmi >= 26)
                        label5.Text = "Sie haben Übergewicht!";
                    else if (bmi >= 20)
                        label5.Text = "Sie haben Normalgewicht!";
                    else if (bmi < 20)
                        label5.Text = "Sie haben Untergewicht!";
                }
            }
        }
    }
}

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Forms;
 
namespace BMI
{
    public partial class Form2 : Form
    {
        public Form2()
        {
            InitializeComponent();
        }
 
        private void button1_Click(object sender, EventArgs e)
        {
            ActiveForm.Close();
 
        }
 
      }
}