Devexpress ASPxComboBox add item in code behind

Byadmin

Feb 2, 2015 #add item, #combobox, #devexpress

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++;
              }