Find specific value in A DataGridView

Question

Hi, Well, I have a DataGridView binded to a TableAdapter and there is an extra empty column named "clmImg" to put an image or color in it. I want to do the following : search through the quantity column, if you find a value less than 15 then put a red color "or red image" in the empty column. I don't know who to write the code. Any help??