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Retrieving DataItem on Postback

This is a discussion on Retrieving DataItem on Postback within the .Net Development forums, part of the Programming & Scripting category; I'm seeing if I can retrieve a DataItem from a datalist when I postback data. I want to retrieve an ...

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  #1  
Old July 21st, 2008, 08:59 AM
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Default Retrieving DataItem on Postback
I'm seeing if I can retrieve a DataItem from a datalist when I postback data. I want to retrieve an item of data from each row that was bound to the datalist.

I have tried this code, but it gives an error:-
Code:
For each item as DataListItem in dlst_policies.items
    update_error.text =item.DataItem("policyref") & "<br />"
next
update_error is just a literal control on my page.

The error I get is:-
Object variable or With block variable not set.

As the datalist contains a List Of a class of mine, I've also tried
Code:
For each item as DataListItem in dlst_policies.items
    Dim comm As PolicyPremiumBOL = item.DataItem
    update_error.text = comm.policyref & "<br />"
next
But then I get an Object reference not set to an instance of an object error.

Is it possible to retrieve the data items when you're posting back or would I need to include a hidden field control or something that contains the data I want?
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  #2  
Old July 21st, 2008, 09:23 AM
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For your first error: Object variable or With block variable not set

For the second problem...are you using one of the DataList events during the postback? DataList Events

And the correct way, would be something like:

Code:
For each item as DataListItem in dlst_policies.items
    Dim comm As PolicyPremiumBOL = CType(item.DataItem, PolicyPremiuBOL)
    update_error.text = comm.policyref & "<br />"
Next
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  #3  
Old July 21st, 2008, 10:02 AM
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I just put in a hidden field containing the reference I needed.
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Old July 21st, 2008, 10:13 AM
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Quote:
Originally Posted by richyrich View Post
I just put in a hidden field containing the reference I needed.
quit taking the easy way...go the .Net way
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Old July 21st, 2008, 10:15 AM
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Quote:
Originally Posted by jmurrayhead View Post
quit taking the easy way...go the .Net way
I will try what you suggested, just needed to get that done quickly and move on to something else...
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