No records in database but form loaded then records show in form

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C#

SQL-Server

SQL-Server-2008

I have deleted all records from database now no records in my database.
but when form loaded then records show in my form.
anyone please help.why this problem coming.

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;
using System.Data.Sql;

namespace MyProject
{

    public partial class Form1 : Form
    {
        DataTable tbl = new DataTable();
        int i = 0;
        
        public Form1()
        {
            InitializeComponent();
        }

       private void Form1_Load(object sender, EventArgs e)
        {

            RefreshData();
        }
           private void display(DataTable tbl)
           {
           txtempid.Text = tbl.Rows[i][0].ToString();
            txtname.Text = tbl.Rows[i][1].ToString();
            txtsurname.Text = tbl.Rows[i][2].ToString();
            txtfathername.Text = tbl.Rows[i][3].ToString();
            dtdob.Text = tbl.Rows[i][4].ToString();
            cbgender.Text = tbl.Rows[i][5].ToString();
            cbcity.Text = tbl.Rows[i][6].ToString();
            txtcontactno.Text = tbl.Rows[i][7].ToString();
            dtdoj.Text = tbl.Rows[i][8].ToString();
            txtdept.Text = tbl.Rows[i][9].ToString();
            txtdesig.Text = tbl.Rows[i][10].ToString();
            txtqualification.Text = tbl.Rows[i][11].ToString();
            rtaddress.Text = tbl.Rows[i][12].ToString();
            rtremarks.Text = tbl.Rows[i][13].ToString();
            
        }
          

        private void button4_Click(object sender, EventArgs e)

        {
          
                SqlConnection conn = new SqlConnection(@"Data Source=.\SQLEXPRESS;AttachDbFilename=C:\Users\manish\Documents\HRM.mdf;Integrated Security=True;Connect Timeout=30;User Instance=True");
               conn.Open();
                SqlCommand command = new SqlCommand();
                 command.CommandText = "insert into emp_detail(empid,name,surname,fathername,dob,gender,city,contactno,doj,department,designation,qualification,address,remarks) values('" + txtempid.Text + "','" + txtname.Text + "','" + txtsurname.Text + "','" + txtfathername.Text + "','" + dtdob.Text + "','" + cbgender.Text + "','" + cbcity.Text + "','" + txtcontactno.Text + "','" + dtdoj.Text + "','" + txtdept.Text + "','" + txtdesig.Text + "','" + txtqualification.Text + "','" + rtaddress.Text + "','" + rtremarks.Text + "')";
                command.Connection = conn;
                command.ExecuteNonQuery();
                MessageBox.Show("Saving is done!");
            
               }
       
        private void RefreshData()
        {
            SqlConnection conn = new SqlConnection(@"Data Source=.\SQLEXPRESS;AttachDbFilename=C:\Users\manish\Documents\HRM.mdf;Integrated Security=True;Connect Timeout=30;User Instance=True");
            conn.Open();
            SqlCommand command = new SqlCommand("select * from emp_detail", conn);
            SqlDataAdapter adp = new SqlDataAdapter(command);
            adp.Fill(tbl);
            display(tbl);
         }