Problem with a text box with custom properties in the IDE

Sanjay Pais

This is an extension of an earlier post
I have created a custom text box and compiled it and dropped it into my
toolbox. However when I change the value of my custom property in design
mode and switch between design mode to page source and back to design mode i
am unable to retrieve the property value I set. Also the property setting in
the html page is lost.

Thsi is the error I get
*************** *************** ****
System.Reflecti on.TargetInvoca tonException: Property accessor
'ApplySecurity' on object 'ATextBox2' threw the follwoing exception: Object
reference not set to an instance of an object~
System.NullRefe renceException
--inner stack trace--
System.Componen tModel.ReflectP ropertyDescript or.GetValue(Obj ect component)
System.Windows. Forms.PropertyG ridInternal.Pro pertyDescriptor GridEntry.GetPr opertyValueCore (Object
target)
System.Windows. Forms.PropertyG ridInternal.Pro pertyDescriptor GridEntry.get_P ropertyValue()

*************** *************** ****
Mu source code is
I have added a custom property called ApplySecurity to the html

my custom text box in the page html source of the designer looks like this
<%@ Page Language="C#" AutoEventWireup ="true"
CodeFile="AEPFi eldDisco.aspx.c s" Inherits="AEPSa mpleWPD" %>

<%@ Register Assembly="AWebC ontrolLibrary" Namespace="AEPo rtal"
TagPrefix="cc1" %>

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.1//EN"
"http://www.w3.org/TR/xhtml11/DTD/xhtml11.dtd">

<html xmlns="http://www.w3.org/1999/xhtml" >

<head runat="server">

<title>Untitl ed Page</title>

</head>

<body>

<form id="form1" runat="server">

<cc1:ATextBox ID="ATextBox1" runat="server"
ApplySecurity=" True"></cc1:ATextBox>

</form>

</body>

</html>

*************** *************** ***************

My text box in the dll has this code

using System;

using System.Collecti ons.Generic;

using System.Text;

using System.Web.UI;

using System.Web.UI.W ebControls;

using System.Componen tModel;

using System.Drawing;

namespace AEPortal

{

[ToolboxData("<{ 0}:ATextBox runat=server
ApplySecurity=T rue></{0}:ATextBox>")]

public class ATextBox : System.Web.UI.W ebControls.Text Box

{

[Bindable(true),

Category("Misc" ),

DefaultValue("F alse")]

string strApplySecurit y = null;

public string ApplySecurity

{
get

{

try

{

strApplySecurit y = this.Attributes["ApplySecur ity"].ToString();

}

catch

{

}

if (strApplySecuri ty == null)

{

this.Attributes .Add("ApplySecu rity", "False");

return "False";

}

else

{

return strApplySecurit y;

}

}

set

{

string strTestValue=nu ll;

try

{

strTestValue = this.Attributes["ApplySecur ity"].ToString();

}

catch { }

if (strTestValue == null)

{

this.Attributes .Add("ApplySecu rity", value);

}

else

{

this.Attributes["ApplySecur ity"] = value;

}

}
}

}

}

Nov 19 '05 #1

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