Encoding u = Encoding.GetEncoding("windows-1251");

            writer = new StreamWriter(Server.MapPath("profile2.txt"), true, u);

            
            for (int irow = 0; irow < grd.VisibleRowCount; irow++)
            {
                for (int icol = 1; icol < grd.Columns.Count; icol++)
                {
                    GridViewDataColumn col = grd.Columns[icol] as GridViewDataColumn;
                    string name_col = col.FieldName;
                    object o = grd.GetRowValues(irow, name_col);
                    string s = o.ToString();
                    write(s);
                      /* detail 
                    GridViewDataColumn dcol = grd.DetailRows...[???] as GridViewDataColumn; ?
                    string name_col2 = dcol.FieldName;
                    object o2 = grd.GetRowValues(irow, name_col2);
                    string s2 = o2.ToString();
                    write(s2);

                     */
                }
                
            }
            writer.Close();