c# read datas datagridview to datagridview in dot 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 GetData : Form
    {
        public GetData()
        {
            InitializeComponent();
        }


        private void label1_Click(object sender, EventArgs e)
        {


        }
        SqlConnection abc = new SqlConnection("Data Source=.;Initial Catalog=dataentry;Integrated Security=True;Pooling=False");
        private void GetData_Load(object sender, EventArgs e)
        {
            SqlDataAdapter asdf = new SqlDataAdapter("select username,pass From LOGINWINDOW",abc);
            DataTable ss = new DataTable();
            asdf.Fill(ss);
            dataGridView1.DataSource = ss;
        }


        private void button11_Click(object sender, EventArgs e)
        {
            foreach (DataGridViewRow datarow in dataGridView1.Rows)
            {
                int num = dataGridView2.Rows.Add();
                foreach (DataGridViewColumn datacolumn in dataGridView1.Columns)
                {
                    dataGridView2.Rows[num].Cells[datacolumn.Index].Value = dataGridView1.Rows[datarow.Index].Cells[datacolumn.Index].Value.ToString();
                }
            }
        }
    }
}

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