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Old April 7th, 2004, 08:19 AM
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Default Referencing a user control properties

I've got a user control that contains a DropDownList and nothing else. It has code behind(VB) that gets information from a database and a property called ValueID so that I can pass it the default item from the parent page. This all works fine and selects the correct item in the dropdown.

What I cannot get to work and have tried always, is if I change the selecteditem I want to get the value and use it on the parent page, which also uses codebehind(VB) to that I can update the database.

Thanks for any help provided
Old April 7th, 2004, 08:29 AM
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Hi there,

Can't you expose another public property that provides this information? When the SelectedIndex changes, retrieve the new value and store it in a private variable.
A public property can then provide access to this private value.

Does that make sense?


Imar Spaanjaars
Everyone is unique, except for me.
Old April 7th, 2004, 08:40 AM
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You need to create a public event on your control. Just like buttons and other controls have events (like .Click), you would need to create one to expose the dropdownlist's change event.

In your UserControl class:

Public Event ValueChanged(ValueID as Integer)

In the DropDownList SelectedIndexChanged event handler:

RaiseEvent ValueChanged(CType(ddl.SelectedValue, Integer))

Then in the page that uses your user control you use the same syntax to handle this event:

Sub myControl_ValueChanged(nValueID As Integer) Handles myControl.ValueChanged
   'Handle event here
   'Because the event passed you the ValueID,
   'you don't need to get it from the control
   'Just use nValueID in the code
End Sub

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