Error While trying to save data to excel file

        private void button3_Click(object sender, EventArgs e)
        {
            try
            {
                OleDbCommand cmd = new OleDbCommand();
                string query = null;
                connect = new OleDbConnection("provider=Microsoft.Jet.OLEDB.4.0; Data Source='c:\\mydemo.xlsx';Extended properties=Excel 8.0;");
                connect.Open();
                cmd.Connection = connect;
                query = "Insert into [Sheet1$] (software_name,versions,keys) values('" + txtSNmae.Text + "','" + txtVersion.Text + "','" + txtKey.Text + "')";
                cmd.CommandText = query;
                cmd.ExecuteNonQuery();
                connect.Close();
            }
            catch (Exception ex)
            {
                MessageBox.Show(ex.ToString());
            }
        }

        
    }
}