C# Form Ortalama hesaplayıcı

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 WindowsFormsApplication3
{
public partial class Form1 : Form
{
public Form1()
{
InitializeComponent();
}

private void btnHesapla_Click(object sender, EventArgs e)
{
double y1, y2, p1, p2, ort;
y1 = Convert.ToDouble(txtYazili1.Text);
y2 = Convert.ToDouble(txtYazili2.Text);
p1 = Convert.ToDouble(txtPerformans1.Text);
p2 = Convert.ToDouble(txtPerformans2.Text);
ort = (y1 + y2 + p1 + p2) / 4;
lblOrtalama.Text = ort.ToString();
if(ort>=50)
{
lblDurum.Text = "GEÇTİNİZ";
lblDurum.ForeColor = Color.Green;
}
else
{
lblDurum.Text = "KALDINIZ";
lblDurum.ForeColor = Color.Red;
}
}
}
}