Redirect if there is no PreviousPage

An online form has been broken down into several steps. Each step is a single aspx page. Sometimes user goes directly into a step in the middle.

To prevent visitor to go to a page directly, below is the code to check to see if there is no previouspage and redirect it to the default.aspx

In VB:
If IsNothing(PreviousPage) Then
Response.Redirect("Default.aspx" )
End If

In C#:
if (PreviousPage == null)


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