Excel - Shading entire row based on change of value

Question

I would like to shade entire rows in Excel based on the value of one cell. For example say I have the rows below:

**File No**
1122
1122
1144
1155
1155
1155
         


        

Answer 1

This one has puzzled me for ages. Don't like the idea of creating an extra (irrelevant) row/column just to calculate formatting. Finally came up with the following rule:

=INDIRECT("A"&ROW())<>INDIRECT("A"&(ROW()-1))

This creates the reference A2<>A1 for row 2, A3<>A2 for row 3 etc. Adjust the letter "A" to be the column you wish to compare