Reading another process's memory with vb.net

i know this question has been asked before but im a little slow!
How can i read the memory of another process using vb.net? i would like a textbox that i can enter the name of the process i want to read memory from and another to enter the memory address i want to read (02641d30 for example) and display the value held in that memory location in another textbox by clicking a button.
If u can give me the code to do this with good comments so i can understand and learn whats going on i would really apreicate it! Ive read a bunch of posts about "readprocessmemory" but just dont quite understand whats going on.

Thanx