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Update a subform's recordsource in an Access database

Overview:
If you have an Access form with a subform, and you want to use VBA code to update the recordsource of the subform as soon as data in the main form changes, use the following VBA code:
 
Dim strsubform As String
strsubform = "SELECT * from a table"
forms!frmMainForm!frmSubform.Form.RecordSource = strsubform
 
This code is typically run whenever data is changed in the main form.   So, if your main Access form allows the user to select a record from a combo box, then this code would run when the combo box is changed (in the after update event).
 
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