I have a gridview with checkbox and textbox. Id like to put in validation that would check for either checkbox = checked and textbox left empty and/or checkbox not checked and textbox has values.
 
How can i do it? 
 
This is layout:
 
This validation would happen when i press submit. I cant figure out how to do it and i have no knowlege of javascript.
 
Please help.
THank You