mysql - retrieving null date from database to vb.net -


i having problem in recovering null date database datepicker in vb.net.

i able save datein mysql null value can't retrieve datepicker.

i tried code doesn't work.

  if reader.isdbnull(0)                             return                         else                             refdate.text = reader.getstring("refdate")                         end if

my code retrieving is

 try              if e.rowindex >= 0                  dim row datagridviewrow                 row = me.datagridview1.rows(e.rowindex)                 forid.text = row.cells("id").value.tostring                  try                     connection.open()                     dim sel string                          sel = "select * recordtracker id ='" & forid.text & "'"                         com = new mysqlcommand(sel, connection)                         reader = com.executereader                      while reader.read                          cancel.show()                         clear.hide()                         rdate.enabled = false                         rfromtbx.enabled = false                          doctype.dropdownstyle = comboboxstyle.dropdown                           id.text = reader.getint32("id")                         doctype.text = reader.getstring("type_of_document")                         itemtbx.text = reader.getstring("items")                         rfromtbx.text = reader.getstring("received_from")                         rdate.text = reader.getstring("received_date")                         remarks.text = reader.getstring("remarks")                         margnote.text = reader.getstring("marginal_note")                         reftotbx.text = reader.getstring("referred_to")                         acttaken.text = reader.getstring("action_taken")                          'refdate.text = reader.getstring("refdate")                          'if reader.read()                         if reader.isdbnull(0)                             return                         else                             refdate.text = reader.getstring("refdate")                         end if                             delete.show()                         ' end if                     end while                  catch ex exception                     msgbox(ex.message)                 end try

any appreciated.

for future use, answer needed asker.

reader.isdbnull(0) gets value of index 0 presume refdate not in first index.

using reader.getstring("refdate") gets string value; therefore, when retrieving null value, returns error better use isdbnull(reader("refdate")) check if field null or not. string value, can use reader("refdate").tostring


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