Automatic row addition in gridview on button click

Hi, 
I changed your.
You should not directly change the cells values, instead of that, you need add the records in your data source and rebind the grid once again.

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;

namespace GridviewExample
{
    public partial class Form1 : Form
    {
        DataTable dt = new DataTable();
        public Form1()
        {
            InitializeComponent();            
            dt.Columns.Add("Name");
            dt.Columns.Add("Address");
            dataGridView1.DataSource = dt;          
        
        }
        private void button1_Click(object sender, EventArgs e)
        {
            DataRow dr = dt.NewRow();
            dr["Name"] = textBox1.Text;
            dr["Address"] = textBox2.Text;
            dt.Rows.Add(dr);
            dataGridView1.DataSource = dt;          
            dataGridView1.Refresh();
            
        }

    }
}

Hope this helps you.