Design and Architecture

using ExcelDataReader;
    using System;
    using System.Collections.Generic;
    using System.ComponentModel;
    using System.Data;
    using System.Drawing;
    using System.Linq;
    using System.Text;
    using System.Threading.Tasks;
    using System.Windows.Forms;
    using System.IO;
    using System.Data.SqlClient;
    
    namespace ReadandImportsheet1
    {
    public partial class Form1 : Form
    {
        
        
        private readonly object con;
        

        public object Break { get; private set; }

        public Form1()
        {
            InitializeComponent();
        }

        public Form1(object con)
        {
            this.con = con;
        }

        private void button1_Click(object sender, EventArgs e)
        {
            OpenFileDialog fil = new OpenFileDialog();
            fil.ShowDialog();
            string path = fil.FileName.ToString();
            ExcelFileReader(path);
        }
        public void ExcelFileReader(string path)
        {
            var stream = File.Open(path, FileMode.Open, FileAccess.Read);
            var reader = ExcelReaderFactory.CreateReader(stream);
            var result = reader.AsDataSet();
            var tables = result.Tables;
            foreach (DataTable table in tables)
            {
                cboSheet.Items.Add(table.TableName);
            }
            //var shname = cboSheet.SelectedValue;
            //string table_name = cboSheet.Text;
        }

        private void cboSheet_SelectedIndexChanged(object sender, EventArgs e)
        {
            string table_name = cboSheet.Text;
            SqlConnection Con = new SqlConnection("Provider = Microsoft.ACE.OLEDB.12.0; Data Source = path; Extended Properties = "Excel 8.0; HDR = YES";");
            con.Open();
            SqlDataAdapter da = new SqlDataAdapter("select * from " + table_name + " ", con);
            DataSet ds = new DataSet();
            da.Fill(ds);
            dataGridView1.DataSource = ds.Tables[0];
            dataGridView1.DataBind();

            con.Close();
        }
    }
}