How to accvess Text Boxes, Fields and Variables in RDLC Code Functions

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Visual-Studio

VS2010

RDLC

I am using VS2010 RDLC and need some help.

On my report I have a blank row and need to display some variable text in it depending on certain conditions.

I have written a Function that I use to make the row visible or hidden but can't figure out way to put text into field Textbox10 on that row.

I've tried using the following format in my function but I get compile error "Field is Type and cannot be used in expression"

Field!Textbox10.value="ABCD"

Also created a Variable and tried

Variables!something.text="WXYZ"

Whats the proper way to access Field Data or Variables within a user created function?