ASP.NET Web窗体页中的类属性（？）

Question

I have created a custom BoundField class in C#. I have added ASP.NET validators to the TextBox and exposed the TextBox OnTextChanged event in Edit and Insert modes. I am experiencing an annoyance with the validators though.

I have exposed the validators publicly like in this example:

private RequiredFieldValidator _requiredFieldValidator;
public RequiredFieldValidator RequiredFieldValidator
{
    get { return _requiredFieldValidator ?? (_requiredFieldValidator = new RequiredFieldValidator()); }
}

I have used this approach to avoid having to set up countless custom public properties in the control itself. I can now do this...

<cc1:BoundFieldWithTextChangedEvent DataField="size2" HeaderText="Width" SortExpression="size2" ItemStyle-CssClass="numeric" OnTextChanged="size2_OnTextChanged" AutoPostBack="True"
            RequiredFieldValidator-Text="!"
            RequiredFieldValidator-Display="Dynamic" />

This code compiles fine and the validations work properly on the page; but I am seeing squiggles under the "RequiredFieldValidator-Text" and "RequiredFieldValidator-Display" attributes in Visual Studio 2013. The first warning is:

Validation (ASP.Net): Attribute 'RequiredFieldValidator-Text' is not a valid attribute of element 'BoundFieldWithTextChangedEvent'.

The other warnings are for the rest of the "RequiredFieldValidator-" attributes.

What do I need to do my custom control code to make these attributes behave properly with Visual Studio 2013?

EDIT: Thanks to Alex Lebedev's help below, my problem has been solved.

I needed to do two things:

1. Add [PersistenceMode(PersistenceMode.InnerProperty)] above my public validator properties in my custom control.
2. Reference the validators as inner elements of my custom control on the web form page.

 <cc1:BoundFieldWithTextChangedEvent DataField="size2" HeaderText="Width" SortExpression="size2" ItemStyle-CssClass="numeric" OnTextChanged="size2_OnTextChanged" AutoPostBack="True" ItemStyle-Wrap="false" ValidationGroup="UpdateItem"> <RequiredFieldValidator Text="!" ErrorMessage="You must specify a width." Display="Dynamic" SetFocusOnError="true" EnableClientScript="true"></RequiredFieldValidator> <CompareValidator Text="*" ErrorMessage="Width must be greater than zero." Operator="GreaterThan" ValueToCompare="0" Type="Double" Display="Dynamic" SetFocusOnError="true" EnableClientScript="true"></CompareValidator> </cc1:BoundFieldWithTextChangedEvent> 

Answer 1

<cc1:BoundFieldWithTextChangedEvent DataField="size2" HeaderText="Width" SortExpression="size2" ItemStyle-CssClass="numeric" OnTextChanged="size2_OnTextChanged" AutoPostBack="True"
            RequiredFieldValidator-Text="!"
            RequiredFieldValidator-Display="Dynamic" />

Replace it with:

<cc1:BoundFieldWithTextChangedEvent DataField="size2" HeaderText="Width" SortExpression="size2" ItemStyle-CssClass="numeric" OnTextChanged="size2_OnTextChanged" AutoPostBack="True">
        <RequiredFieldValidator Text="!" Display="Dynamic"/>
</cc1:BoundFieldWithTextChangedEvent>