c# code for get datas from datagridview to combobox 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 DatatoCombobox : Form
    {
        public DatatoCombobox()
        {
            InitializeComponent();
        }
       
        SqlConnection Connection = new SqlConnection("Data Source=.;Initial Catalog=DATAENTRY;Integrated Security=True;Pooling=False");
        private void DatatoCombobox_Load(object sender, EventArgs e)
        {


        }


        private void button9_Click(object sender, EventArgs e)
        {
            SqlDataAdapter asdf = new SqlDataAdapter("select* from register",Connection);
            DataTable SS = new DataTable();
            asdf.Fill(SS);
            dataGridView1.Rows.Clear();
            foreach (DataRow ab in SS.Rows)
            {
                int num = dataGridView1.Rows.Add();
                dataGridView1.Rows[num].Cells[0].Value = ab["NAME"].ToString();
                dataGridView1.Rows[num].Cells[1].Value = ab["GENDER"].ToString();
                dataGridView1.Rows[num].Cells[2].Value = ab["AGE"].ToString();
                dataGridView1.Rows[num].Cells[3].Value = ab["SALARY"].ToString();
                dataGridView1.Rows[num].Cells[4].Value = ab["STATUS"].ToString();
            }
        }


        private void button1_Click(object sender, EventArgs e)
        {
            comboBox1.Items.Clear();
            foreach (DataGridViewRow datarow in dataGridView1.Rows)
            {
               
            }
            MessageBox.Show("Seccessfully Filled");


            foreach (DataGridViewRow datarow in dataGridView1.Rows)
            {
                comboBox1.Items.Add(datarow.Cells[1].Value.ToString());
            }


        }
    }
}

Video For Result:

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