Strange behavior data-bound combobox

  • Thread starter Thread starter Crazy Cat
  • Start date Start date
C

Crazy Cat

I am using a data-bound combobox with dropdownstyle set to
dropdownlist. Teh combobox is bound to a bindingsource which is in turn
bound to a table in my database. The table has only 4 rows and I am
using it to display geographical regions - Northeast, Southeast, West,
and Central. In the bindingsource AddNew is set to false.

Whenever I select an item from the combobox I find that the position in
the dropdown list is replaced by the value that was displayed prior to
making the new selection. For example when I start the application and
view the dropdown list I see the following

West
Central
Southeast
Northwest

with West being initially displayed in the textbox. If I select
Southeast the list changes to the following

Southeast
Central
Southeast
Northwest

and Southeast is displayed in the textbox. I can no longer select West
because it is no longer in the dropdown list !!!!

This seems like a bug to me -- or is that how the combobox is supposed
to work? I want my list to be immutable.

What am I doing wrong?

Thanks,

Crazy
 
Crazy said:
I am using a data-bound combobox with dropdownstyle set to
dropdownlist. Teh combobox is bound to a bindingsource which is in turn
bound to a table in my database. The table has only 4 rows and I am
using it to display geographical regions - Northeast, Southeast, West,
and Central. In the bindingsource AddNew is set to false.

Whenever I select an item from the combobox I find that the position in
the dropdown list is replaced by the value that was displayed prior to
making the new selection. For example when I start the application and
view the dropdown list I see the following

West
Central
Southeast
Northwest

with West being initially displayed in the textbox. If I select
Southeast the list changes to the following

Southeast
Central
Southeast
Northwest

and Southeast is displayed in the textbox. I can no longer select West
because it is no longer in the dropdown list !!!!

This seems like a bug to me -- or is that how the combobox is supposed
to work? I want my list to be immutable.

What am I doing wrong?

Thanks,
Click to expand...
Sorry to respond to myself but I found the solution and wanted to share
it should anyone run into this problem. The problem was that I had set
Data Source and Data Member properties of the data-bound control,
without realizing that the Data Set Manager had set the Text property
under the Databindings properties (it's easy to miss since the Text
property is a sub property of the Databindings and is not visible until
you expand Databindings). Anyways once I set the Text subproperty to
nothing all was fine.
 
Seems like you have bound the "DataSource" property (which only provides the
list of items) and the Text property (which gets and updates a field in a
dataset) to the same thing. Just a quick guess. They're supposed to be
different.
 
Back
Top