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Zone: > NEWSGROUP > Asp.Net Forum > visual_studio.visual_studio_2005 Tags:
Item Type: NewsGroup Date Entered: 10/12/2005 9:48:30 PM Date Modified: Subscribers: 0 Subscribe Alert
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brandon1974
Asp.Net User
Checkbox List problem10/12/2005 9:48:30 PM

0/0

Hello everyone, I'm using VS 2005 Beta 2, VB.NET.

I have a page with a datalist, a panel, a check box list and a "save" button.

When the selected index of the datalist changes, the checkbox list is populated from a database, and pre-selected items are determined.

Everything is right with the world, until the "save" button gets clicked.

The checkbox list loses all of its values, and returns nothing, zilch, nada. None of the selected or non-selected items will be present to use elsewhere.

I know that selecting a value in the datalist causes a postback, and that clicking the "save" button is causing another postback, which is *probably* why my checkbox list is losing it's values.

Does the checkbox list need to be re-created from viewstate when the page is initalized? If so, can someone please point me to an example in VB.NET?  I can translate C# if needs be.

Thanks in advance for your time,
Brandon
gknierim
Asp.Net User
Re: Checkbox List problem10/13/2005 2:10:58 AM

0/0

Hi Brandon,

Are the ITEMS in the checkbox list created at runtime, or just the values for the items?

If the items for the list are created, you will need to make sure that EnableViewState is true for the checkboxlist. Also, make sure that you are not creating the checkboxlist items each time the page loads by placing the

if (!IsPostBack)

{

}

section in the Page_Load event.

Let me know if this helps!

Greg

"Providing software solutions for your world!"
Excellent .NET Hosting here!
brandon1974
Asp.Net User
Re: Checkbox List problem10/13/2005 2:47:18 AM

0/0

Hi Greg, thanks for your reply.

The check box list is populated from a Data reader when the selected index of a Data List is changed. Then the values for which items are checked is done by looping through another data reader.

I did set the EnableViewState attribute to true for the CheckboxList, and the CheckboxList is only populated during the SelectedIndexChanged event of the Data List, not during the Page Load.

Thanks,
Brandon
Armysniper
Asp.Net User
Re: Checkbox List problem10/14/2005 8:31:52 PM

0/0

Ensure that you do not have code in your Load that resets the values of the CheckedListBox. When you perform a selected index event, you are doing a post back. In your load code make sure you check for postbacks. If it is a postback dont do code that would initialize the page. Use the Page.IsPostBack property to check for it in your load code.
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