private void bCSVRead_Click(object sender, EventArgs e)
        {
            String newID = null;
            string _constr = "Provider=Microsoft.Jet.OLEDB.4.0;Data" & _
              "Source=C:\\Endo.csv" +
                 "Extended Properties='text;HDR=Yes;FMT=Delimited;'";
            string _sql = "SELECT DISTINCT obj_textmacro FROM (Endo.csv) WHERE" & _
              "obj_textmacro LIKE 'dev%'";
            DataTable dt = new DataTable();
            OleDbConnection conn = new OleDbConnection(_constr);
            OleDbDataAdapter da = new OleDbDataAdapter(_sql, conn);
            OleDbCommand cmd = new OleDbCommand(_sql,conn);
 
            try
            {
                conn.Open();
                da.Fill(dt);
                conn.Close();
                dgv.DataSource = dt;
            }
            catch (Exception ex)
            {
                throw ex;
            }             
         }