VB.Net - Reflection: Reflected Method from loaded assembly is executed before method call. What for?

When I load an assembly dynamically and then call a method from within it, I seem to be getting a method from the assembly, executed before the code in the method that calls it. It doesn't seem to execute in a sequential order as I expected. Can anyone please explain why this might be happening. Below is some code to illustrate what I see, the code from the some.dll assembly calls a method named PerformLookup. For testing purposes, I posted a similar output of the MessageBox type with the text "PerformLookup Time:". Eventually I see:

First: "PerformLookup Time: 40:842"

Second: "initIndex Time: 45:873"

Imports System
Imports System.Data
Imports System.IO
Imports Microsoft.VisualBasic.Strings
Imports System.Reflection

Public Class Class1
    Public Function initIndex(indexTable as System.Collections.Hashtable) As System.Data.DataSet
        Dim writeCode As String
        MessageBox.Show("initIndex Time: " & Date.Now.Second.ToString() & ":" & Date.Now.Millisecond.ToString())
        System.Threading.Thread.Sleep(5000)
        writeCode = RefreshList()
    End Function

    Public Function RefreshList() As String   
        Dim asm As System.Reflection.Assembly
        Dim t As Type()
        Dim ty As Type
        Dim m As MethodInfo()
        Dim mm As MethodInfo
        Dim retString as String
        retString = ""

        Try
            asm = System.Reflection.Assembly.LoadFrom("C:\Program Files\some.dll")
            t = asm.GetTypes()
            ty = asm.GetType(t(28).FullName) 'known class location
            m = ty.GetMethods()
            mm = ty.GetMethod("PerformLookup")
            Dim o as Object
            o = Activator.CreateInstance(ty)
            Dim oo as Object()   
            retString = mm.Invoke(o,Nothing).ToString()
        Catch Ex As Exception       
        End Try

        return retString
    End Function
End Class

      

        
        
        
      

    

I added a flush statement to the end of my write method, even though I had a StreamReader.Close () call. Same results. Here are some results from the debug statements I put in to try and diagnose this further. In initIndex I have

write(timestamp)  
save(file)  
write(save success)  
write(saved value)  
write(timestamp)  
write(file create / file modified times)   
sleep(5 seconds)  
invoke(assembly method)  
write(timestamp)  

      

        
        
        
      

    

And in the build method I have:

write(timestamp)  
sleep(5 seconds)  //yes, two 5 second sleeps between write and read  
read(file)  
write(file value)  
write(timestamp)  
write(file create / file write times)  

      

        
        
        
      

    

Here is my output from the initIndex log file:

17:732  
True  
A/P  
17:732  
5/17/2010 11:59:30 AM / 5/18/2010 7:49:17 AM  
22:748  

      

        
        
        
      

    

And here is the output from the Assembly log file:

12:670  
CASH  
17:685  
5/17/2010 11:59:30 AM / 5/18/2010 7:41:20 AM