May be this is what will help you.
DataTable table = ds.Tables[0];
foreach (DataRow dr in table.Rows)
{
lst_ArabNames.Add(dr["Name_arabic"].ToString());
}
Explanation: I am not sure when you filled your dataset, that time you named the datatable as 'Med'.But if, fortunately, you wouldn't have named it then what I have given should work.
This is because you may be then just populating the dataset with the query result-set and in no way is the front-end aware of what is 'Med' referring to ?
HTH
Regards,
Rajeev
Please vote and mark the answer as accepted if this helps you.