C# - Combo Box item missing after an event fires

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Hi,

Good Day!

Anyone can help me this combo box problem.
I have a combox box that bound a collection objects.

C#

bdsItemCode.DataSource = SalesCostItem.GetSalesCostItemByCustVendTypeBranchAndSystemJob(objCurrentCustomerDTO.CustVendTypeCode, objTruckInvoice.BranchCode, objCurrentSpecialJobDetail.systemJobRelation);
cboItemCode.DataSource = bdsItemCode;
cboItemCode.DisplayMember = "SalesCostItemCode";

My problem is some items will be missing or hiden from dropdownlist after selectionIndexchange. First load the combo box item looks complete, but after several item seletions some item from dropdown list are missing.

Is any idea to solved this problem is highly appreciated.

Thank you very much.

Posted 14-Sep-11 18:09pm

Gerry Logrosa

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SwaxRak 15-Sep-11 3:06am

Are you adding all Items (through Datasource) during every selectionIndexchange?

Gerry Logrosa 15-Sep-11 3:39am

No, I loaded all the items(List<classobject>) during form load.

Gerry Logrosa 15-Sep-11 3:52am

during loading all items were loaded properly. The problem occur during selection changed. First I select item[0], then second select another item, third selection I observed that the item[0] is missing from the dropdownlist.

KenBonny 15-Sep-11 3:17am

This is where you databind the list items to the combobox, probably done in the constructor or when the form loads. Could you post the on selection changed function too, because I can't divine what happens from this example.

Gerry Logrosa 15-Sep-11 3:44am

Hi sir KenBonny,here code inside SelectedIndexChanged.

protected virtual void cboItemCode_SelectedIndexChanged(object sender, EventArgs e)

{

objCurrentInvoiceItem.ItemCode = cboItemCode.Text.ToString();

if (parentquotationNo != "")
{

GetJobAndTransportRate(out objTransportRate, out msg, out transportRateUOMList);

} DisplayItemInfo();
}

KenBonny 15-Sep-11 3:53am

I don't see the problem from your code. Best solution I can give you is to add a watch to your DataSource on the combobox and see when it changes, then inspect where it changes and take it from there.

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SwaxRak · Answer 1 · 2011-09-14T21:10:00

Solution 1

While debugging Check the Count of bdsItemCode and cboItemCode , May be the problem with binding datasource

Posted 14-Sep-11 21:10pm

SwaxRak