AjaxToolKit CalendarExtender Problems

In my Summary page, I have two CalendarExtender controls to enable someone to select Start Date and End Date for database queries.

In the head of my Summary.aspx page, I have the following declarations:

<%@ MasterType VirtualPath="~/Site.Master" %>
<%@ Page Title="ACP Sheet Metal - Summary" Language="C#" MasterPageFile="~/Site.Master" AutoEventWireup="true" CodeBehind="Summary.aspx.cs" Inherits="AcpSheetMetal.Summary" UICulture="es" Culture="es-MX" %>
<% @Import Namespace="System.Globalization" %>
<%@ Register TagPrefix="asp" Namespace="AjaxControlToolkit" Assembly="AjaxControlToolkit"%>

For the page itself, I have a ToolkitScriptManager, two (2) TextBox controls, two CalendarExtender controls, and a GridView control:

<ajaxToolkit:ToolkitScriptManager ID="ToolkitScriptManager2" runat="server" EnableScriptGlobalization="true" EnableScriptLocalization="true" />
<asp:TextBox ID="txtStartDate" runat="server" />
<asp:CalendarExtender ID="calExStartDate" runat="server" TargetControlID="txtStartDate" OnClientShown="ChangeCalendarView" OnClientDateSelectionChanged="checkDate" />
<asp:TextBox ID="txtEndDate" runat="server" />
<asp:CalendarExtender ID="calExEndDate" runat="server" TargetControlID="txtEndDate" OnClientShown="ChangeCalendarView" OnClientDateSelectionChanged="checkDate" DaysModeTitleFormat="MM/dd/yyyy" DefaultView="Months" Enabled="True" TodaysDateFormat="MMMM dd, yyyy" />
<asp:GridView ID="summaryGridView" runat="server" />

In the Page_Load event in the C# code, I have placed the following:

protected void Page_Load(object sender, EventArgs e) {
  MasterPage = (SiteMaster)Page.Master;
  if (!Page.IsPostBack) {
    calExEndDate.TodaysDateFormat = System.Globalization.CultureInfo.CurrentCulture.DateTimeFormat.ShortDatePattern;
    calExStartDate.TodaysDateFormat = System.Globalization.CultureInfo.CurrentCulture.DateTimeFormat.ShortDatePattern;
  }
}

So, why are my Calendar controls not working? There are no values in the calendars and the language appears to be Spanish.

enter image description here

Solution

Your language is Spanish and I believe it's so because your UICulture is UICulture="es" (ESpañol) and Culture="es-MX" (Español México).

See this line on your markup:

<%@ Page Title="ACP Sheet Metal - Summary" Language="C#" MasterPageFile="~/Site.Master" AutoEventWireup="true" CodeBehind="Summary.aspx.cs" Inherits="AcpSheetMetal.Summary" UICulture="es" Culture="es-MX" %>

The rest of your markup looks okay to me.