VB.NET DirectorySearcher Won't retrieve AD users with empty properties -


i using code retrieve user ad datagridview on windows form. works long none of properties empty. 

private sub button9_click(sender system.object, e system.eventargs) handles button9.click     dim direntry system.directoryservices.directoryentry         dim mysearcher system.directoryservices.directorysearcher         dim domainname string = system.net.networkinformation.ipglobalproperties.getipglobalproperties().domainname            try             direntry = new system.directoryservices.directoryentry("ldap://" & environment.userdomainname)              mysearcher = new system.directoryservices.directorysearcher(direntry)             mysearcher.filter = "(samaccountname=" & textbox8.text & ")"              mysearcher.propertiestoload.add("samaccountname")             mysearcher.propertiestoload.add("displayname")             mysearcher.propertiestoload.add("description")             mysearcher.propertiestoload.add("mail")             mysearcher.propertiestoload.add("profilepath")             mysearcher.propertiestoload.add("homedirectory")             mysearcher.propertiestoload.add("homedrive")             mysearcher.propertiestoload.add("givenname")             mysearcher.propertiestoload.add("sn")              dim sr searchresult = mysearcher.findone()             if sr nothing 'return false if user isn't found                  'msgbox("cannot find")             end if              dim de system.directoryservices.directoryentry = sr.getdirectoryentry()              dim sam string = de.properties("samaccountname").item(0).tostring             if sam = ""                 sam = " - "             end if              dim displayname string = de.properties("displayname").item(0).tostring             if displayname = ""                 displayname = " - "             end if              dim description string = de.properties("description").item(0).tostring             if description = ""                 description = " - "             end if              dim email string = de.properties("mail").item(0).tostring             if email = ""                 email = " - "             end if              dim profile string = de.properties("profilepath").item(0).tostring             if profile = ""                 profile = " - "             end if              dim homedir string = de.properties("homedirectory").item(0).tostring             if homedir = ""                 homedir = " - "             end if              dim homedrv string = de.properties("homedrive").item(0).tostring             if homedrv = ""                 homedrv = " - "             end if              dim givenname string = de.properties("givenname").item(0).tostring             if givenname = ""                 givenname = " - "             end if              dim sn string = de.properties("sn").item(0).tostring             if sn = ""                 sn = " - "             end if              'datagridview3.rows.add(de.properties("samaccountname").value.tostring, de.properties("givenname").value.tostring & " " & de.properties("sn").value.tostring, de.properties("profilepath").value.tostring, de.properties("homedirectory").value.tostring, de.properties("homedrive").value.tostring, "", "", "", "", "")             datagridview3.allowusertoaddrows = true             datagridview3.rows.add(sam, displayname, description, email, profile, "", homedir, "", homedrv, "")             datagridview3.allowusertoaddrows = false          catch          end try         direntry.dispose()         mysearcher.dispose()        end sub

the parts of code use:

if sam = ""         sam = " - "     end if

were attempt combat doesnt work. if find user in ad , fill in blank fields user retrieved.

please can me identify cause , how might able resolve it.

for information...

i using visual studio 2010

.net 3.5 +

many thanks,

aaron

  1. as know on ad samaccountname cannot null or empty.
  2. when attribute not set null, not "".
    safety may check both "" , null.

-

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