How do I find the file path from a namespace.class name?

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file-system

I'm programatically looking into an .aspx file and getting the file class name declared in its CodeBehind. For example, when analyzing myFile.aspx, I read in its Page Directive and found its CodeBehind equals "myApplication\myPage.aspx.vb". Then I use the code below:

Dim Assm As System.Reflection.Assembly = System.Reflection.Assembly.LoadFrom("myApplication\bin\myApplication.dll")
Dim ClassType As Type = Assm.GetType("myApplication\myPage.aspx.vb")

' myBaseType = "myApplication.Forms.BasePage"
Dim myBaseType As System.Type = ClassType.BaseType

Now I want to read the BaseFile (class = myApplication.Forms.BasePage). However, to read in this file, I need to get its full path instead of its namespace.class hierarchy. In this case, the BasePage is wrapped in a different namespace declaration, thus I cannot just change the '.' to '\' in order to get the path.

How can I get the path of BasePage so I can read it? Thank you - Frank