Hi,

I have a WebDropDown inside an updatepanel. The DataSource is bound as expected to a BindingList of Entities:

this.NullText = "Select a Field"

this.WebDropDown1.DataSource = this.GetEntityList();

this.WebDropDown1.TextField = "Description"

this.WebDropDown1.ValueField = "ID"

this.WebDropDown1.DataBind();

The SelectedValue property is not bound to any data nor setted to an initial value.

The control is displayed and works. We can see "Select a Field" and choose any other item.

The first thing I noticed is that the RequiredFieldValidator linked to the control, does not work. If I submit the form and no item is selected in the WebDropDown, the form is submitted and no validation is performed.

The second issue is that at server side I cannot see the Selected value.

I want to set the value to a data field:

this.User.CountryID = this.WebDropDown.SelectedValue

A NullReferenceException is thrown.

Debugging There is no SelectedItem, Items is empty. It seems that datalist is not binding properly.

Any Idea of what is happening?

Thanks in advance