Student Marksheet with grades windows form project in C# demo

Student Mark-sheet windows form in C# demo

Below is the program which takes students name, marks of 6 subjects as an input. After a button click it will display result either PASS, FAIL or ATKT (for 2 backlogs). 

Below is the design view of the project:

Below is the windows C# source code:

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 marksheet_demo
{
    public partial class Form1 : Form
    {
        int m1, m2, m3, m4, m5, m6, total;
        float per;
        String name, grade, result;

        public Form1()
        {
            InitializeComponent();
        }

        private void textBox5_TextChanged(object sender, EventArgs e)
        {

        }

        private void button1_Click(object sender, EventArgs e)
        {
           name= textBox1.Text;

            textBox9.Text = per.ToString();
            if ((Int32.Parse(textBox2.Text) > 100) || (Int32.Parse(textBox3.Text) > 100) || (Int32.Parse(textBox4.Text) > 100) || (Int32.Parse(textBox5.Text) > 100) || (Int32.Parse(textBox6.Text) > 100) || (Int32.Parse(textBox7.Text) > 100))
            {
                MessageBox.Show("Marks should be below 100");
            }

            m1 = Int32.Parse(textBox2.Text);
            m2 = Int32.Parse(textBox3.Text);
            m3 = Int32.Parse(textBox4.Text);
            m4 = Int32.Parse(textBox5.Text);
            m5 = Int32.Parse(textBox6.Text);
            m6 = Int32.Parse(textBox7.Text);

            total = m1 + m2 + m3 + m4 + m5 + m6;
            per = total / 6;

          

            if ((m1 >= 40 && m2 >= 40 && m3 >= 40 && m4 >= 40 && m5 >= 40 && m6 >= 40))
            {
                result = "PASS";
                textBox8.Text = result.ToString();
            }
            else if ((m1 <= 40 && m2 <= 40 && m3 >= 40 && m4 >= 40 && m5 >= 40 && m6 >= 40) || (m1 <= 40 && m2 >= 40 && m3 <= 40 && m4 >= 40 && m5 >= 40 && m6 >= 40) || (m1 <= 40 && m2 >= 40 && m3 >= 40 && m4 <= 40 && m5 >= 40 && m6 >= 40) || (m1 <= 40 && m2 >= 40 && m3 >= 40 && m4 >= 40 && m5 >= 40 && m6 <= 40))
            {
                result = "ATKT";
                textBox8.Text = result.ToString();
            }
            else
            {
                result = "FAIL";
                textBox8.Text = result.ToString();
            }

            textBox9.Text = per.ToString();

            if (per >= 75.00)
            {
                grade = "A+";
                textBox10.Text = grade.ToString();
            }
            if (per < 75.00 && per >=65.00)
            {
                grade = "A";
                textBox10.Text = grade.ToString();
            }

            if (per < 65.00 && per >= 55.00)
            {
                grade = "B+";
                textBox10.Text = grade.ToString();
            }

            if (per < 55.00 && per >= 45.00)
            {
                grade = "B";
                textBox10.Text = grade.ToString();
            }

            if (per < 45.00 && per >= 40.00)
            {
                grade = "C";
                textBox10.Text = grade.ToString();
            }

            label11.Text = textBox1.Text.Trim().ToString();
            label11.Visible = true;
        }
    }
}