put the System.Windows.Form.ComboBox in Datagridview C# windows application

We want to attach a combo box into a cell of data grid view.
 Now it works with mouse click. but for faster moving of form we need it to work using keyboard.

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 GridComboSampleCode
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }
        void CreateGrid() 
        {
            DataTable dt = new DataTable();
           
            dt.Columns.Add("EmpName", typeof(string));//0
            dt.Columns.Add("EmpID", typeof(int));//1
            dt.Columns.Add("PhoneNo", typeof(string));//2
            dt.Columns.Add("Address", typeof(string));//3
            dt.Columns.Add("Email", typeof(string));//4

            dataGridView1.DataSource = dt;
            dataGridView1.Controls.Add(comboBox1);

        }
        private void Form1_Load(object sender, EventArgs e)
        {
            CreateGrid();
            fillRecords(1);
        }
        string SQL;
        void fillRecords(int QueryNo)
        {
            SqlConnection con = new SqlConnection(@"Data Source=APPLE-PC\RNS;Initial Catalog=DemoDatabase;User ID=sa;Password=rns11");
            con.Open();

            if (QueryNo==1)
            {
                SQL = "Select EmpName,EmpID from EmployeeMaster";
            }
            else if (QueryNo==2)
            {
                SQL = "Select PhoneNo,Address from EmployeeMaster where EmpID=" + comboBox1.SelectedValue.ToString();
            }

            SqlDataAdapter da = new SqlDataAdapter(SQL, con);
            DataTable dt = new DataTable();
            da.Fill(dt);
            con.Close();


            if (QueryNo == 1)
            {
                comboBox1.DataSource = dt;
                comboBox1.DisplayMember = "EmpName";
                comboBox1.ValueMember = "EmpID";
            }
            else if (QueryNo == 2)
            {
                dataGridView1.CurrentRow.Cells[1].Value = comboBox1.SelectedValue.ToString();
                dataGridView1.CurrentRow.Cells[0].Value = comboBox1.Text;
                DataRow dr=dt.Rows[0];
                dataGridView1.CurrentRow.Cells[2].Value = dr["PhoneNo"];
                dataGridView1.CurrentRow.Cells[3].Value = dr["Address"];

            }
        }
        private void dataGridView1_CellEnter(object sender, DataGridViewCellEventArgs e)
        {
            if (dataGridView1.CurrentCell.ColumnIndex==0)
            {
                comboBox1.Visible = true;
                comboBox1.Location = dataGridView1.GetCellDisplayRectangle(e.ColumnIndex, e.RowIndex, true).Location;
                comboBox1.Size = dataGridView1.CurrentCell.Size;
            }
        }

        private void dataGridView1_CellLeave(object sender, DataGridViewCellEventArgs e)
        {
            if (dataGridView1.CurrentCell.ColumnIndex == 0)
            {
                comboBox1.Visible = false;
               
            }
        }

        private void comboBox1_SelectedIndexChanged(object sender, EventArgs e)
        {
            if (comboBox1.SelectedValue.ToString()!="System.Data.DataRowView")
            {
                fillRecords(2);
            }
        }
       


    }
}