Saturday, September 16, 2006

Cannot bind to the new display member

I am working on an internal "report generator" tool at work. One of the forms has a listbox control. This is what I was trying to do:


' myHashTable holds objects of type "Report"
ListBox.DataSource = myHashTable.Values
ListBox.DisplayMember = "ReportName"
ListBox.ValueMember = "ReportCode"


This looks pretty straight forward. But when I ran the code, I got "Cannot bind to the new value member" exception. Googling this error did not get me anywhere. While mucking aound with the code I changed "ReportName" and "ReportCode" in my "Report" class from members to properties. And WALLA this worked!!

Hopefully this post will save someone a headache.

# posted by Rushabh : 3:51 PM
Comments:
This is happening to me today, except, I'm binding directly from a dataset... Any ideas?
# posted by Anonymous Sam : September 19, 2006 10:01 AM
 
Got it. A silly error message for a silly error. I had a query with a union, and the column names didn't match. Something like this:

select code1
from table1
union
select code2
from table2

Fixed it by doing this:

select code1 as code
from table1
union
select code2 as code
from table2

Hope this helps someone else to fix this problem quickly and easily.
# posted by Anonymous Sam : September 19, 2006 10:46 AM
 
Thanks - I had that same problem and you saved me (well, you and google that is)
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# posted by Anonymous Anonymous : March 18, 2007 3:27 AM
 
'Move .Datasource to last row
ListBox.DisplayMember = "ReportName"
ListBox.ValueMember = "ReportCode"
ListBox.DataSource = myHashTable.Values
# posted by Anonymous wanida : March 20, 2007 10:46 PM
 
I had this error when the DisplayMember was missing from the control's DataSource (which was a DataTable).
# posted by Anonymous Anonymous : March 30, 2007 10:43 AM
 
I had a similar problem. Thanks.
# posted by Anonymous Anonymous : August 02, 2007 1:03 PM
 
Exactly the same problem but one more silly requirement is we must make them public properties.
# posted by Anonymous Anonymous : February 27, 2008 2:08 AM
 
My problem was that the user did not have permissions to access the stored procedure the datasource was set at. It was hard to catch because I was not getting any errors when testing from my machine
# posted by Blogger hec : January 14, 2009 1:28 PM
 
Thank you!
# posted by Anonymous Anonymous : March 19, 2009 9:18 PM
 
I already got the headache, but at least this helped me solve the problem! Of course, after looking more closely at the DisplayMember documentation, I can see that it is listed as a property. Seems strange!
# posted by Blogger Tim : August 24, 2009 9:04 PM
 
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