为什么AutoCompleteExtender触发Page_Load事件而不是service方法？

Question

So I'm trying to implement the AutoCompleteExtender tool from the AJAX Control Toolkit.

The following is the implementation of the AutoCompleteExtender on my ASPX page:

<asp:TextBox runat="server" ID="CustomerTextBox" CssClass="form-control" AutoComplete="off" />
<asp:RequiredFieldValidator runat="server" ControlToValidate="CustomerTextBox"
    CssClass="text-danger" ErrorMessage="The Customer field is required." Display="None" />
<ajaxToolkit:AutoCompleteExtender ID="CustomerAutoCompleteExtender" runat="server" TargetControlID="CustomerTextBox"
    MinimumPrefixLength="1" EnableCaching="true" CompletionSetCount="1" CompletionInterval="1000" 
    ServiceMethod="GetAllCustomerNames">
</ajaxToolkit:AutoCompleteExtender>

This is the service method implemented in the code behind file:

[System.Web.Services.WebMethod()]
[System.Web.Script.Services.ScriptMethod()]
public static string[] GetAllCustomerNames(string prefixText, int count)
{

    List<string> allCustomerNames = new List<string>();
    List<Customer> allCustomers = GetAllCustomers();

    foreach (Customer customer in allCustomers)
    {
        if (customer.CustomerName.Contains(prefixText))
        {
            allCustomerNames.Add(customer.CustomerName);
        }
    }

    return allCustomerNames.ToArray();
}

The problem I'm facing is that whenever I type a character into the text box the Page_Load event fires instead of the GetAllCustomerNames method. Could someone please help me find where I'm going wrong?

Additional info:

• I'm using Visual Studio 2013.
• This is a ASP.NET Web Form application running on .NET 4.5.
• I used the default style and template as when a new project is created and so a Master Page is being used.
• The ToolkitScriptManager is specified in the Master File and I have set EnablePageMethods property to true.

Answer 1

Try [System.Web.Services.WebMethod] not WebMethod() and remove the next line.

You set AutoPostBack="true" on the TextBox, just delete AutoPostBack or set it to false .