Two data grids comparing values

[John Wright]

I have a datagrid that contains a list of decimal values. I want to compare
the values of one datatable to the other datatable and update my data grid.
For example my first datatable has the following data

Sample Number Location Reading1 Reading2 Reading3
Reading4.......ReadingX
12345 1 22.3 21.2
31.5 28.3 54.2
12345 2 21.4 23.2
33.8 31.9 49.9
.....

In my second table I have the following

Reading Min Max
1 20.3 24.1
2 20.8 21.1
3 30.1 32.2
4 14.1 16.8
....
X 49.1 55.2
What I would like to see in the data grid would be the readings and if the
reading is low, put the grid cell background in one color (yellow) and if it
is high, but the cell background in another color (red). The number of rows
in the first datatable will rarely be over 50 rows. The second table to
compare high low values will be around 20 rows. I have created a procedure
to go through every row, grab the value, look up the value in the second
table, and put the results in an array with the reading, followed by a 0,1,2
to indicate low, in range, high.

Results
Sample 12345 Results
22.3,1
21.2,2
31.5,1
28.3,2
54.2,1

I then want to parse the array and populate a table with the results. Would
it be easier to put the first table into a Datagrid, then move through each
cell and compare values? Any help would be great.

John