vb.net - Operator '=' is not defined for type 'DBNull' and type 'Integer' -


i've been struggling past few hours , still can't head round 1 . issue having when has been admitted database updates giving them bedid , when try , discharge them can't seem set bedid (in database) nothing . issue need able admit , discharge many people can.

sub dis1_click(byval s object, byval e eventargs) handles dis1.serverclick      dim time string = now().tostring("dd-mm-yyyy hh:mm:ss")      sql = "update allocation  set bedid = null , dischargedate =" + "'" + time + "'" + " bedid = 1 "     cmd = new odbccommand(sql, cn)     cmd.executenonquery() end sub  sub bedcheck1()     if r("bedid") = ""     else         if r("bedid") = 1             ba = s & "<tr><td>" & r("surname") & "</td>" & "<td>" & r("forename") & "/<td>" & "<td>" & r("admitdate") & "</td>" & "<td>" & r("dischargedate") & "</td>" & "<td>" & r("comments") & "</td></tr>"         end if     end if end sub

thanks!

you need dbnull-check before read value:

if not isdbnull(r("bedid"))      if r("bedid") = ""     else if r("bedid") = 1         ba = s & "<tr><td>" & r("surname") & "</td>" & "<td>" & r("forename") & "/<td>" & "<td>" & r("admitdate") & "</td>" & "<td>" & r("dischargedate") & "</td>" & "<td>" & r("comments") & "</td></tr>"     end if end if

note dbnull special case , need use isdbnull-function prevent error


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