i want to calculate total gross salary hoew can i do that any one tell me

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C#

i want to calculate total gross salary hoew can i do that any one tell me
i have 1>Basic Sal
2>HRD
3>DA
4>P.F
5>Gross Sal
6>Net Paid
when i enter basic salary in textbox automatically i want to come total calculate in datagridview
how can i do that any one tell me



this is my 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 treeview_grossalary
{
    public partial class Form1 : Form
    {
        SqlConnection con = new SqlConnection("Data Source=CIODEV03\\SQLEXPRESS;Initial Catalog=EmployeeDB;Integrated Security=True");
        SqlCommand cmd = new SqlCommand();

        public Form1()
        {
            InitializeComponent();
        }


        private void Form1_Load(object sender, EventArgs e)
        {
            getdata();


        }
        private void getdata()
        {
            string str = "select * from gridsalry";
            SqlDataAdapter ada = new SqlDataAdapter(str, con);
            DataSet ds = new DataSet();
            ada.Fill(ds);
            dataGridView1.DataSource = ds.Tables[0];
             }

        private void btnsave_Click_1(object sender, EventArgs e)
        {
            string str = "insert into gridsalry values('" + textBox1.Text + "','" + textBox2.Text + "','" + textBox3.Text + "','" + textBox4.Text + "','" + textBox5.Text + "','" + textBox6.Text + "','" + textBox7.Text + "','" + textBox8.Text + "')";
            con.Open();
            cmd = new SqlCommand(str, con);
            cmd.ExecuteNonQuery();
            con.Close();
            getdata();
           }
        
    }

}