ASP.NET GridView OnDataBound Sort in Code Behind - asp.net

Question

I have a GridView where one of the columns/fields has checkboxes; the checkboxes are checked or unchecked, based on a sub-query from the code behind, while the container GridView is bound to a SqlDataSource. What I want to be able to do is that once the GridView is databound then make it sort by the state of checkboxes: All rows with checkboxes checked appear on the top of grid. Here is part of my GridView:
<ItemTemplate>
<asp:CheckBox ID="ProductSelector" runat="server" Checked='<%# ShowCheckMarks(DataBinder.Eval(Container.DataItem,"prodid").ToString()) %>' />
</ItemTemplate>
I am thinking that I can call the GridView's Ondatabound event and someone make it sort from there?
Thanks.

Answer 1

If that is the only row that you need to sort by why not just add an order by to the sql query you're using to pull the data?

Answer 2

You can save yourself a lot of work if you
store the state of checkbox in database
. That way you can easily set a sort expression on the template field.
Edit
You can do this on clientside via jQuery tablesorter but it might be a
bit too much of work Check this.
Again I think you can somehow manipulate the query to achieve this.
Try this
SELECT dbo.Products.*, dbo.products_recommended.* FROM dbo.Products INNER JOIN dbo.products_recommended ON (dbo.Products.prodid = dbo.products_recommended.prodid) WHERE dbo.Products.prodid IN (dbo.products_recommended.prodid) AND (dbo.Products.prodid = " + itemid + " order by dbo.Products.prodid desc )"
Please note : Never use a
select a.* from YourTable a
This will select all columns from your table & may bring a serious problem later on. Only query the columns you want like
select a.column1,a.column2 from YourTable a

Answer 3

SELECT dbo.Products.prodid,
dbo.Products.itemtitle,
dbo.Products.itemnumber,
dbo.Products.image_1,
CAST(ISNULL(dbo.products_recommended.recommendedid, 0) as BIT) as recommendedid
FROM dbo.Products LEFT OUTER JOIN dbo.products_recommended
ON (dbo.Products.prodid = dbo.products_recommended.prodid)
WHERE dbo.Products.prodid IN (dbo.products_recommended.prodid)
AND (dbo.Products.prodid = #itemid)
The left outer join will make sure it pulls all items from the Products table while only pulling matching items from the products_recommended table. It will also convert the recommendedid to a BIT value which should work with the checkboxes

Answer 4

Like the good helpers here suggested, I needed to have main sql query to populate the GridView to sort the records, instead of a different query in the code behind. So now the Declarative SqlDataSource syntax is the following. This solves the problem.
I learned a few hew things from the feedback here. Thank you all!
SELECT DISTINCT Products.prodid,
Products.itemtitle,
Products.itemnumber,
Products.image_1,
CASE WHEN YESNO IS NULL THEN CAST(0 AS BIT) ELSE CAST(1 AS BIT) END AS CheckUncheck
FROM Products
LEFT OUTER JOIN (SELECT prodid_recommended as YESNO FROM products_recommended
WHERE #itemid IN (prodid) ) A
ON Products.prodid = A.YESNO
ORDER BY CheckUncheck DESC