making patch hex editing in .net

Hi Guys
I searched a lot and asked for code as well but did not got the clear answer the one I'm looking for and almost every forum says dont ask about it,it is regarding our policy and no one is helping me.

I want to edit the hex of the file and insert bytes in a .exe file
like DUP2 does but want to make program in vb.net

For example

Code:

Private Sub Button1_Click(sender As Object, e As EventArgs) Handles Button1.Click

Here i need the code that once i click button1 it search the code and replace it like example ("C:\testcrack.exe")

End Sub

so that when I click button1 it searches hex like 12 23 34 45 56 67 78 and modify it to 00 00 00 00 10 00 01

please help me i have wasted my one week and what i try never works like binary writer if any master here could help me with the code i would be so happy