Unable to retrieve ListBox ValueMember???

[=?Utf-8?B?UGFvbG8=?=]

From a combo box I use the SelectedValue property as a parameter to a query
from which I populate a ListBox


private void cmbxCategory_Se lectedValueChan ged(object sender, EventArgs e)
{
string theCatId = cmbxCategory.Se lectedValue.ToS tring();

var getSubCat =
from sc in dataSet.SubCate gory
where (theCatId == sc.S_CatId)
select sc.S_Descriptio n; // get the Description

lsbxSubCat.Data Source = getSubCat.ToLis t(); // put Description
in ListBox
}

I then want to get the data from the ValueMember of the ListBox's selected
item.
However, using MessageBox to display my required result is showing "".

private void lsbxSubCat_Sele ctedValueChange d(object sender,
EventArgs e)
{
string theSubCatId = lsbxSubCat.Sele ctedValue.ToStr ing(); // get
the Id for the Description
MessageBox.Show (theSubCatId);
}

Can anyone point out any obvious errors?

Thanks

[Marc Gravell]

Re: Unable to retrieve ListBox ValueMember???

ValueMember only makes sense if you are data-binding via DataSource.
Have you done this?

Marc

[=?Utf-8?B?UGFvbG8=?=]

Re: Unable to retrieve ListBox ValueMember???

Marc: yes, I am (on my form_Load event. However my LINQ query was incorrect
as I was only selecting S_Description, I need also to select S_Id, which is
my ValueMember. Everything works as required now.

"Marc Gravell" wrote:

ValueMember only makes sense if you are data-binding via DataSource.
Have you done this?
>
Marc
>