ASP.net Error adding control in Page PreInit event

Hi. The following code gives me an error at the line marked "Error Here"

    Private Sub Dynamic_Data_PreInit(sender As Object, e As EventArgs) Handles Me.PreInit
        Dim oDropDownList As New DropDownList
        oDropDownList.ID = "d1"
        oDropDownList.Items.Add("Test")
        Me.Panel_Controls.Controls.Add(oDropDownList) 'Error here
  End Sub

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Murray BrownMicrosoft Cloud Azure/Excel Solution DeveloperAsked:
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Fernando SotoConnect With a Mentor RetiredCommented:
I am not a web developer but from the exception the control that has issues is the Panel_Controls. From Microsoft documentation during Page.PreInit the controls have not yet been initialized and therefore the error. Try using the Page.Init event, this is where the controls have already been initialized.
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Murray BrownMicrosoft Cloud Azure/Excel Solution DeveloperAuthor Commented:
Great answer. Thanks very much
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Fernando SotoRetiredCommented:
Not a problem murbro, glad I was able to help.
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