I have been trying to create a custom web control with the C# Web Control 

Library wizard.  This generates a bare-bones control derived from the 

System.Web.UI.WebControls.WebControl class.  Everything works fine when I 

first drag the control from the toolbox onto a web form.  But when I save 

the web form and reload, I always get an "Error creating web control" 

message on my form.  Any programming I do against the control still works 

fine when I view the web form in a browser, but the control doesn't seem 

to get created correctly on the IDE's web form design surface (nor does it 

show up in the Properties viewer -- although the tag is still there for it 

when I view the Web Form's HTML).  The problem seems to be limited to 

viewing the control in the IDE.



I've tried to create a few controls derived from 

System.Web.UI.WebControls.WebControl, but this happens with all of them 

(including, as I mentioned, the plain vanilla one generated with the C# 

Web Control Library wizard.)  This is driving me crazy, because I've been 

able to do all sorts of neat things with a custom designer and custom 

property editors and it all works great when I first create the custom 

control.  But since I can't get any of these controls (including the 

wizard-generated one) to reload once the web forms have been  saved, I 

can't continue to use the design-time behavior that I'm working with.



Has anyone seen this problem and discovered any work around.  This problem 

has surfaced on two separate machines with the Beta 1 installation on it.

This is a known problem in beta1 that will be fixed in beta2.  For now, you

need to force VS to reload the control after you load your project.

Sometimes this can help:



1. switch between the html view and the design view and sometimes that kicks

it into action

2. Add and delete the reference to the control library.



HTH,



Rich

----- Original Message -----

From: "Michael Clagett" <mclagett@n...>

To: "ASP+" <aspx@p...>

Sent: Tuesday, March 06, 2001 11:12 PM

Subject: [aspx] Error creating web control





> I have been trying to create a custom web control with the C# Web Control

> Library wizard.  This generates a bare-bones control derived from the

> System.Web.UI.WebControls.WebControl class.  Everything works fine when I

> first drag the control from the toolbox onto a web form.  But when I save

> the web form and reload, I always get an "Error creating web control"

> message on my form.  Any programming I do against the control still works

> fine when I view the web form in a browser, but the control doesn't seem

> to get created correctly on the IDE's web form design surface (nor does it

> show up in the Properties viewer -- although the tag is still there for it

> when I view the Web Form's HTML).  The problem seems to be limited to

> viewing the control in the IDE.

>

> I've tried to create a few controls derived from

> System.Web.UI.WebControls.WebControl, but this happens with all of them

> (including, as I mentioned, the plain vanilla one generated with the C#

> Web Control Library wizard.)  This is driving me crazy, because I've been

> able to do all sorts of neat things with a custom designer and custom

> property editors and it all works great when I first create the custom

> control.  But since I can't get any of these controls (including the

> wizard-generated one) to reload once the web forms have been  saved, I

> can't continue to use the design-time behavior that I'm working with.

>

> Has anyone seen this problem and discovered any work around.  This problem

> has surfaced on two separate machines with the Beta 1 installation on it.

>

>

>

Michael..



	I have exactly the same problem, and this is by no means new, in the

old Interdev V6, you could not switch to Design view if you had any CRBs

(Code Render blocks, the <% %> delimiters, with the message "The editor  is

unable to switch to Design view because there is script inside a <SELECT>

tag"



	Hence, what I do  when I create an ASPX form, is to drag all the

Server controls I want onto the form, set their properties and then handball

code the rest from the HTML view.



	Obviously, the boys at Redmond have some work to do here, as many

developers will want a Design/Layout view that works !





Bill Belfield

Application Developer, UK Systems Team 

Project Affirm Offices, F123 Regus 5300 Lakeside,

Cheadle Royal Business Park.

Tel (+44) 0161 246 6873

(mailto:bill.belfield@a...)





> 

> 1. Error creating web control

> 

> ----------------------------------------------------------------------

> 

> Subject: Error creating web control

> From: "Michael Clagett" <mclagett@n...>

> Date: Tue, 6 Mar 2001 23:12:39

> X-Message-Number: 1

> 

> I have been trying to create a custom web control with the C# Web Control 

> Library wizard.  This generates a bare-bones control derived from the 

> System.Web.UI.WebControls.WebControl class.  Everything works fine when I 

> first drag the control from the toolbox onto a web form.  But when I save 

> the web form and reload, I always get an "Error creating web control" 

> message on my form.  Any programming I do against the control still works 

> fine when I view the web form in a browser, but the control doesn't seem 

> to get created correctly on the IDE's web form design surface (nor does it

> 

> show up in the Properties viewer -- although the tag is still there for it

> 

> when I view the Web Form's HTML).  The problem seems to be limited to 

> viewing the control in the IDE.

> 

> I've tried to create a few controls derived from 

> System.Web.UI.WebControls.WebControl, but this happens with all of them 

> (including, as I mentioned, the plain vanilla one generated with the C# 

> Web Control Library wizard.)  This is driving me crazy, because I've been 

> able to do all sorts of neat things with a custom designer and custom 

> property editors and it all works great when I first create the custom 

> control.  But since I can't get any of these controls (including the 

> wizard-generated one) to reload once the web forms have been  saved, I 

> can't continue to use the design-time behavior that I'm working with.

> 

> Has anyone seen this problem and discovered any work around.  This problem

> 

> has surfaced on two separate machines with the Beta 1 installation on it.

> 

>