Showing a textbox based on a query result

I have an access table that holds customer information and another table that holds orders associated with those customers.  I want to place a textbox on the form that is used to enter customer information that alerts the salesperson if there is an order associated with that customer based on matching a customer number between those two tables.  So, if there are no orders the textbox is blank, but if there are turn it red and display some text.  If there are orders I want to show a button that I will use to open a form to show those orders.

I know enough about access to create the queries and forms and such, but I don't know how to change the behaviour of a textbox based on the results of a query.

dgoogeAsked:
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Rey Obrero (Capricorn1)Commented:
place this code in the afterupdate event of CustNumTextBox


private sub CustNumTextBox_afterupdate()
if dcount("*","tblOrders","customernumber =" & me.CustNumTextBox)>0 then
  me.YourNEWTextbox.backcolor=vbred
  else
   me.YourNEWTextbox.backcolor=vbwhite
end if

end sub

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place this codes in the current event of the form

private sub form_current()

if dcount("*","tblOrders","customernumber =" & me.CustNumTextBox)>0 then
  me.YourNEWTextbox.backcolor=vbred
  else
   me.YourNEWTextbox.backcolor=vbwhite
end if


end sub

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Rey Obrero (Capricorn1)Commented:

you can use dlookup() or dCount() functions to check if records exists for a customer..

in the afterupdate event of the textbox where you enter customer number

private sub txtcustomer_afterupdate()
if dcount("*","tableName","customernumber =" & me.txtcustomer)>0 then
  me.YourNEWTextbox.backcolor=vbred

end if

end sub
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als315Commented:
You can use dlookup for searching records for this customer and if returned falue (records count, for example) >0 set text and color of textbox
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dgoogeAuthor Commented:
We're getting closer, the customer number will already be on the form where the alert will be shown ( I know I said textbox in my first post, but I don't know what is more appropirate to show an alert, a textbox or a label) , tblCustomer.CustomerNumber is the field name.  I need to match that with tblOrders.CustomerNumber.  I have very little experience with VBA, so I need a bit more handholding.
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Rey Obrero (Capricorn1)Commented:
is CustomerNumber field Text Or Number data type?
what is the name of the textbox for the CustomerNumber?

a label or textbox will do.
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dgoogeAuthor Commented:
It is a number field, the textbox that houses the customer number is CustNumTextBox
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