How to programmatically add items on DropDownEdit asp.NET (VB) - asp.net

Question

I made a webForm in which I simply put a DropDownList like this :
<table>
<tr>
<td>
<dx:ASPxDropDownEdit runat="server"></dx:ASPxDropDownEdit>
</td>
</tr>
</table>
How can I programmaically add item in it ? I would like to display simple text (like "Item1", "Item2, ...) when clicking on the down arrow of this element.

Answer 1

From: ASPxDropDownEdit Overview
The ASPxDropDownEdit represents an editor containing an edit box to
display the editor value and a specific button, that opens a dropdown
window whose content can be templated. The main purpose of the
ASPxDropDownEdit is to allow you to define its value based upon the
value(s) of other control(s) integrated into the editor's
DropDownWindowTemplate.
As per the documentation, you can not use it as like a combo box control. I suggest you use ASPxComboBox, which let you implement this functionality in easy way.
If you desperate to implement the DropDownEdit control then you need to create its DropDownWindowTemplate programmatically. Follow the below approach and you can try to implement what you want to accomplish.
// Assign DropDownWindowTemplate property to custom template
protected void Page_Load(object sender, EventArgs e)
{
ASPxDropDownEdit1.DropDownWindowTemplate = new CustomTemplate();
}
//Template class that implement ITemplate interface.
public class CustomTemplate:ITemplate
{
public void InstantiateIn(Control container)
{
ASPxListBox listBox = new ASPxListBox();
listBox.Items.Add("Item 1");
listBox.Items.Add("Item 2");
listBox.Items.Add("Item 3");
container.Controls.Add(listBox);
}
}
Refer this:
Creating Web Server Control Templates Programmatically