How block entry to form if password field is blank

I have this code in an onclick event of a command button on a form but it allows the user to just proceed with nothing in the password field.

What is wrong with this?

If Me.txtPassword <> DLookup("[MaintPassword]", "tblSetup") Or Me.txtPassword = "" Then
        MsgBox "You do not have permission to use any of the database maintenance functions."

--Steve
SteveL13Asked:
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COACHMAN99Connect With a Mentor Commented:
try
If NZ(Me.txtPassword,"")  <> DLookup("[MaintPassword]", "tblSetup")   Or Me.txtPassword ="" then
0
 
Rey Obrero (Capricorn1)Commented:
If  Nz(DLookup("MaintPassword", "tblSetup", "MaintPassword ='" & Me.txtPassword & "'"),"")="" Or Me.txtPassword = "" Then

MsgBox "You do not have permission to use any of the database maintenance functions."

exit sub
else


end if

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or
If Me.txtPassword & "" = "" Then
    Exit Sub
end if

If  Nz(DLookup("MaintPassword", "tblSetup", "MaintPassword ='" & Me.txtPassword & "'"),"")=""  Then

MsgBox "You do not have permission to use any of the database maintenance functions."

exit sub
else


end if

Open in new window

0
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