ตัวอย่างการทำ combobox ให้ดึงข้อมูลจาก datasource และ add new item ลงไปด้วยในส่วน code behind
<%@ Page Language="C#" AutoEventWireup="true" CodeFile="Default.aspx.cs" Inherits="_Default" %>
<%@ Register Assembly="DevExpress.Web.ASPxEditors.v12.1, Version=12.1.6.0, Culture=neutral, PublicKeyToken=b88d1754d700e49a"
Namespace="DevExpress.Web.ASPxEditors" TagPrefix="dx" %>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head runat="server">
<title>ASPxComboBox: Add an item to the ItemCollection after data-bound and perform custom client-side validation</title>
</head>
<body>
<form id="form1" runat="server">
<div>
<table class="style1">
<tr>
<td>
<strong>Products:</strong></td>
</tr>
<tr>
<td>
<dx:ASPxComboBox ID="cmbox" runat="server" ClientInstanceName="cmbox"
TextField="ProductName" ValueField="ProductID" DataSourceID="AccessDataSource1"
ondatabound="cmbox_DataBound">
<ClientSideEvents Validation="function(s, e) {
if (s.GetSelectedIndex()==0) {
e.isValid = false;
e.errorText = "You should Select One of the Products";
}
}" />
<ValidationSettings ValidateOnLeave="False">
</ValidationSettings>
</dx:ASPxComboBox>
</td>
</tr>
<tr>
<td>
<dx:ASPxButton ID="btn" runat="server" AutoPostBack="False" ClientInstanceName="btn"
Text="Validate">
<ClientSideEvents Click="function(s, e) {
cmbox.Validate();
}" />
</dx:ASPxButton>
</td>
</tr>
</table>
</div>
<asp:AccessDataSource ID="AccessDataSource1" runat="server" DataFile="~/App_Data/Northwind.mdb"
SelectCommand="SELECT [ProductID], [ProductName] FROM [Products]"></asp:AccessDataSource>
</form>
</body>
</html>
using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;
using DevExpress.Web.ASPxEditors;
public partial class _Default : System.Web.UI.Page
{
protected void cmbox_DataBound(object sender, EventArgs e)
{
ListEditItem defaultItem = new ListEditItem("------Select One------------", -1);
cmbox.Items.Insert(0, defaultItem);
cmbox.SelectedIndex = 0;
}
}
สำหรับตัวอย่าง Add Month , Year ใน Combobox
int j = 0;
for (int i = 2556; i <= Convert.ToInt16(DateTime.Now.ToString("yyyy", CultureInfo.GetCultureInfo("th-TH"))); i++)
{
ListEditItem defaultItem = new ListEditItem(i.ToString(), i);
cbbYear.Items.Insert(j, defaultItem);
cbbYear.SelectedIndex = j;
j++;
}
// Get the en-US culture.
CultureInfo ci = new CultureInfo("th-TH");
// Get the DateTimeFormatInfo for the en-US culture.
DateTimeFormatInfo dtfi = ci.DateTimeFormat;
int jMonth = 0;
foreach (string name in dtfi.MonthGenitiveNames)
{
ListEditItem defaultItem = new ListEditItem(name, (jMonth+1));
cbbMonth.Items.Insert(jMonth, defaultItem);
cbbMonth.SelectedIndex = 0;
jMonth++;
}