DLookup 作为访问表单中的控制源的错误

Question

I have a text box with the control source of Dlookup function. But the Dlookup format makes me crazy, I tried a hundred times to refer another combo box value as criteria in Dlookup function. I got either "# name?" or "# Error".

I tried this:

=DLookUp("[Contact]","Supllier","[Company]='" & [Forms]![PurchaseOrder]![cboSupplierCompany] & "'")

and got "# Error"

when I input :

=DLookUp("[Contact]","Supllier","[Company]='" & [Me]![cboSupplierCompany] & "'")

I got "# Name?"

Answer 1

I finally found the solution. The right way to use Dlookup in a expression is to use the expression editor to select table field and form control.

the working expression of Dlookup in my textbox is :

DLookUp(" [Supplier]![Contact] ","Supplier"," [Supplier]![Company] ='" & [cboSupplierCompany] & "'")

Answer 2

Using a SQL-query window above-like versions work fine. But they did not work in the ControlSource property setting.

Here you have to use semicolons (;) instead of commas (,). At least in a German language settings environment (?). Control setting = in German:

Steuerelementinhalt
= DLookUp(" [Supplier]![Contact] ";"Supplier";"  [Supplier]![Company] ='" & [cboSupplierCompany] & "'"