How to set a RadComboBox that is using a data source to a selected value in codebehind

Question

I have a RadComboBox that is bounded by a datasource. I set the datacource to select from a the database using a select query. Run I run the project, I get a complete list of items in the RadComboBox.

I want to set the RadComboBox to a selected value, or index in the codebehind. So the RadComboBox will have a value in it once the page is load, instead of it being empty.

I have tried to do this with the code like so:

RadComboBoxItem item = RCB_PO_NUM.FindItemByText("2000");
item.Selected = true;

But I get a null value in the debugger once I run the program. I have tried to put the code in the Page_Load , Page_LoadComplete, and Page_Init methods. It still comes back as an null value. Can some please tell me where I should put the code, so that it will not return a null value?

Dropout

Answer 1

You can add a property on your viewModel for the selected item and bind the radion button's SelectedItem property to it.

Alternatively try this code in the RCB_PO_NUM.DataBound event handler.

RadComboBoxItem item = RCB_PO_NUM.FindItemByText("2000");
RCB_PO_NUM.SelectedItem = item;

Tyrocidine

Looking into it now. Thanks – Dropout

I updated my answer. There should be DataBound event on that control. – Zoography

That event handler never gets fired – Dropout

That means you don't bind the control at all. You should bind DataSource then the event will fire. How do you populate the items? – Zoography

I set the datacource to select from a the database using a select query. I can see all the items in the list drop down of the combobox once the page is loaded – Dropout

I added SqlDataSourcePO_NUM.DataBind(); on the page_load method, the even still never gets fired – Dropout

Are you sure you attach to the event not too late? Try also the Load and PreRender events of the control itself not the page. – Zoography

I had the property load on demand set to true. I like that feature. Once I set it to false the RCB_PO_NUM.DataBound, I didn't need to set the SqlDataSourcePO_NUM.DataBind(), the event fired with out – Dropout

I wish there was a way for me to keep the EnableLoadOnDemand property set the true – Dropout