c# code for sum and average datagridview column in .net

This is A C# Practice code:

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Windows.Forms;
using System.Data.SqlClient;




namespace dataentry
{
    public partial class UserLogin : Form
    {
        public UserLogin()
        {
            InitializeComponent();
        }
      
private void button5_Click(object sender, EventArgs e)
        {
            int A = 0, B = 0;
            for (A = 0; A < dataGridView1.Rows.Count; ++A)
            {
                B += Convert.ToInt32(dataGridView1.Rows[A].Cells[4].Value);
            }
            label10.Text = B.ToString();
        }


        private void button6_Click(object sender, EventArgs e)
        {
            {
                int A = 0, B = 0;
                for (A = 0; A < dataGridView1.Rows.Count; ++A)
                {
                    B += Convert.ToInt32(dataGridView1.Rows[A].Cells[4].Value);
                }
                int NUMofROWS = dataGridView1.Rows.Count;
                double AVG = B / NUMofROWS;
                label11.Text = AVG.ToString();
            }


        }


        private void button8_Click(object sender, EventArgs e)
        {
            int A = 0, B = 0;
            for (A = 0; A < dataGridView1.Rows.Count; ++A)
            {
                B += Convert.ToInt32(dataGridView1.Rows[A].Cells[5].Value);
            }
            label13.Text = B.ToString();
        }


        private void button7_Click(object sender, EventArgs e)
        {


            int A = 0, B = 0;
            for (A = 0; A < dataGridView1.Rows.Count; ++A)
            {
                B += Convert.ToInt32(dataGridView1.Rows[A].Cells[5].Value);
            }
            int NUMofROWS = dataGridView1.Rows.Count;
            double AVG = B / NUMofROWS;
            label12.Text = AVG.ToString();
        }


    }
}

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