Double Pad;
    SqlCommand cmd = new SqlCommand("SELECT * FROM M25 WHERE Mu/bd2 = Muad", con);
    SqlDataAdapter adp = new SqlDataAdapter(cmd);
    DataSet ds = new DataSet();
try
                {
                    con.Open();
                    Pad = Convert.ToDouble(ds.Tables["M25"].Rows[0].ItemArray[2].ToString());
                 }
                catch (Exception ex)
                {
                    Console.WriteLine(ex.Message);
                }
                finally
                { con.Close(); }