hello
i have created DataTable ('dt') with 4 columns, now i want to add another column but i want this column to be the first column(its mean in index 0) and not in the end of this DataTable.
what can i do?
thanks
koby

I don't recall it being possible to insert a column into the DataColumnCollection class. The only method available is Add and it always appends to the end. So to do what you asked, you must clear the existing collection. Add the new column then add back your original 4 columns. Something like
  dt.columns.copyto(myarray, 0);
  dt.columns.clear;
  dt.columns.add(mycolumn);
  dt.columns.addrange(myarray);