How to display the excel file in data gridview

public partial class Form1 : Form
    {
       public Form1()
        {
            InitializeComponent();
           
        }
        public string[] GetExcelSheetNames(string excelfilename)
        {
            OleDbConnection con = null;
            DataTable dt = null;

            string connStr = "Provider=Microsoft.ACE.OLEDB.12.0;Data Source=" + excelfilename + ";Extended Properties=Excel 12.0;";
con = new OleDbConnection(connStr);
                 con.Open();
                 dt = con.GetOleDbSchemaTable(OleDbSchemaGuid.Tables, null);
            if (dt == null)
            {
                return null;
            }
            string[] excelSheetNames = new String[dt.Rows.Count];
            int i = 0;

            foreach (DataRow row in dt.Rows)
            {
                excelSheetNames[i] = row["TABLE_NAME"].ToString();
                i++;
            }
            con.Close();
            return excelSheetNames;
        }
  

        private void button1_Click(object sender, EventArgs e)
        {
                OpenFileDialog openDialog = new OpenFileDialog();
                openDialog.Title = "";
                openDialog.InitialDirectory = @"C:\\";
                openDialog.Filter = "ExcelSheet(*.xsls)|*.xsls|All Files(*.*)|*.*";
                openDialog.FilterIndex = 1;
                openDialog.RestoreDirectory = true;
                if (openDialog.ShowDialog() == DialogResult.OK)
                {
                    if (openDialog.FileName != "")
                    {
                        textBox1.Text = openDialog.FileName;
                       
                        comboBox1.DataSource = GetExcelSheetNames(openDialog.FileName);
     
                    }
                }
                else
                {
                    MessageBox.Show("chose Excel sheet path..", "Information", MessageBoxButtons.OK, MessageBoxIcon.Information);
                }
                        
        }

      private void comboBox1_SelectedIndexChanged_1(object sender, EventArgs e)
        {
            OleDbConnection con = null;
            String conStr = "Provider=Microsoft.Jet.OLEDB..0;" + "Data Source=" + textBox1.Text + ";Extended Properties=Excel 8.0;";
            con = new OleDbConnection(conStr);
            OleDbCommand oconn = new OleDbCommand("Select * From [" + comboBox1.SelectedValue + "]", con);
            OleDbDataAdapter da = new OleDbDataAdapter(oconn);


            DataTable data = new DataTable();
            da.Fill(data);
            dataGridView1.DataSource = data;
            
        }              
    }
}