Search a gridview and change the item color if found in a query result

Posted on 2007-12-06
Last Modified: 2008-02-01
I have been struggling with this and am frustrated that it isn't easier (or I am not smarter).
What I am trying to accomplish is I have a page of fixed items that I want to vary the color if they show up in a SQL query. I have tried a datalist and now using several gridviews to post the data into.

For example:
SHELF1        SHELF2        SHELF3            <--- These are individual gridviews (shelf1, shelf2, etc)
ABC               DEF              GHI
JKL                 MNO            QRP

When I click a button I will execute a SQL query to a database and if any of the results contain an item in any of the gridviews it will change the item's cell color so as to indicate a match. So I need to loop through each gridview and if there is a match then color, if not then move to the next gridview.

This sounds so simple but not sure if the way I have laid it out will work. I had to break this down into multiple gridviews since I do not want a single column with over 60 rows. And when I tried a dataview someone told me I could not change the item color.

This is webforms, VB 2005

Help! Please?
Question by:edrz01
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LVL 23

Expert Comment

ID: 20419171
See if this helps..

There are other articles on data grid and view as well.

Author Comment

ID: 20419239

Thanks - I will see if I can decode the C# into vb and let you know.

Expert Comment

ID: 20419669
It should be possible using the OnRowDataBound event of the gridview.  I didn't check that link naveenkohli gave, but I can assist if you are going to do it this way.  In VB too...
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LVL 23

Expert Comment

ID: 20419778
The link gives you the idea on how to modify behavior in OnRowCreated event. you should be able to wrie your own solution in VB.Net on similar lines. If you run into any issue feel free to let me know. I can try to wing some VB code :-)

Author Comment

ID: 20420229
Thanks both, I found a site that converted the C# to VB. What it provided is listed below:
    Protected Sub OnRowCreated(ByVal sender As Object, ByVal e As GridViewRowEventArgs)
        If e.Row.RowType = DataControlRowType.DataRow Then
            Dim drv As Data.DataRowView = TryCast(e.Row.DataItem, Data.DataRowView)
            Dim ob As Object = drv("Weight")
            If Not Convert.IsDBNull(ob) Then
                Dim dVal As Double = 0.0F
                If [Double].TryParse(ob.ToString(), dVal) Then
                    If dVal > 3.0F Then
                        Dim cell As TableCell = e.Row.Cells(1)
                        cell.CssClass = "heavyrow"
                        cell.BackColor = System.Drawing.Color.Orange
                    End If
                End If
            End If
        End If
    End Sub
What I needed is code which will allow me to search each gridview and compare to the returned values provided by the SQL query. Then if a match is made it will change the background color. In the sample provided by the link it looks like it is looking for a hard coded value.

Expert Comment

ID: 20420455
I would suggest, perhaps, a query to your db in the page load and set this as a dataset.  You should be able to reference this dataset outside of that sub if you declare it in the class itself, rather than in the sub.  Then, in your OnRowCreated sub, you can cycle through the dataset for each row/cell that you want and perform your highlighting then.

Does that make sense?

Author Comment

ID: 20421780
I am hitting a wall.....
In the example I provided how would I search for, say,  'MNO' which resides under the SHELF2 gridview?
In this example I want to search through all of the rows in SHELF2 and when I find the cell or row that contains 'MNO' do something with it.
If you could provide code it would help......

Accepted Solution

divinewind80 earned 500 total points
ID: 20421887
Dim ob As Object = drv("SHELF2")

You should be able to reference the contents of the cell by ob.tostring directly... for instance:

If ob.tostring = "MNO" then
Do something here...
End if

Does that help?

Author Comment

ID: 20422315
Well I must be well off the beaten path. Either what I am trying to do is not possible or I am not explain it very well.....
When my page loads it populates the various gridviews with data from an Access source (so I can't use the above in a Page load). I have to wait until the data is populated in the gridviews before I do the next step which is to execute another query against another source and if that query returns data to compare against all of the gridviews and if it finds a match to change the background color.
So  the comparison must
1) compare the current gridview items against the results of a query
2) step through each gridview and look at the values in each row, cell
3) change the background color if it has a match

If the gridview is not the way to go - let me know......

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