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ASP.NET - Set index of drop-down list based on value.

Posted on 2008-06-12
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Last Modified: 2013-11-26
I've got a page with a dropdownlist on it.  When the page is requested, there is a value passed in the url query string that represents the value of one of the list items of the drop-down list.  As the page loads I'm trying to set the selected item of the drop-down list based on the value that is being passed in.

url query string is something like:
http://www.xyz.com/page.aspx?WHEREID=37

attempted code:
this code throws an error saying that FindByValue() cannot be converted.
ddlSelectLevel.SelectedIndex = Convert.ToInt32(ddlSelectLevel.Items.FindByValue(Request("WHEREID")))
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Question by:josephdaviskcrm
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10 Comments
 
LVL 48

Expert Comment

by:jpaulino
ID: 21771603
It should be:

ddlSelectLevel.SelectedIndex = Convert.ToInt32(ddlSelectLevel.Items.FindByValue(Request.QueryString("WHEREID")))
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Author Comment

by:josephdaviskcrm
ID: 21771676
No, (Request("WHEREID") returns the value I'm needing.  The problem lies somewhere in the rest of the line of code.
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LVL 16

Accepted Solution

by:
ororiole earned 2000 total points
ID: 21771749
FindByValue returns an item, not a string. use:
ddlSelectLevel.SelectedIndex = ddlSelectLevel.IndexOf(ddlSelectLevel.Items.FindByValue(Request("WHEREID")))
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LVL 48

Expert Comment

by:jpaulino
ID: 21771789
Sorry you're right!
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LVL 16

Expert Comment

by:ororiole
ID: 21771815
Hey even a blind squirrel like me finds a nut once in a while. :)
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LVL 48

Expert Comment

by:jpaulino
ID: 21771828
:)
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Author Comment

by:josephdaviskcrm
ID: 21771917
The dropdownlist server control has no .IndexOf() method, unless it is in a higher version of the .NET framework than I am using, which is 2.0.
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LVL 48

Expert Comment

by:jpaulino
ID: 21772112
Can you try ?

ddlSelectLevel.SelectedValue = ddlSelectLevel.Items.FindByValue(Request("WHEREID")).Value
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Author Comment

by:josephdaviskcrm
ID: 21772135
Ok... I figured it out...   Its like you said ororiole but with one small change. its ddlSelectLevel.Items.IndexOf()

ddlSelectLevel.SelectedIndex = ddlSelectLevel.Items.IndexOf(ddlSelectLevel.Items.FindByValue(Request("WHEREID")))
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Author Closing Comment

by:josephdaviskcrm
ID: 31466641
its ddlSelectLevel.Items.IndexOf()
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