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File Upload Size Limit
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Jacob Kruger
Hi all

Playing around with uploading files using HttpPostedFile.

Seems like there's a limit on the size of the file (Request?) of around
4Mb.

Anyone found a way to work around this, or increase the limit, or am I
doing something wrong?

When I try a bigger file I get a DNS error in IE, and in Netscape, the
page just goes nowhere.

Never hits the code.

Would seem to be some sort of server configuration issue.

Cheers

Jacob Kruger
Web Developer
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Yannick Smits
(From Scott Guthrie) By default ASP.NET limits the size of file uploads to
around 4Mb. This is to prevent denial of service attacks where people try to
bring down a server by launching massive files at it.
To enable support for larger files, you should add the following
configuration setting value to your apps (or machine's web.config file):

<configuration>
<system.web>
<httpRuntime maxRequestLength="4096" />
</system.web>
</configuration>

Note that the "4096" value above is the size in Kbytes that is configured
out of the box (in machine.config). You should change it to be whatever size
you want.

hth,
Yannick Smits

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Das (VIP)
Read my article at http://aspalliance.com/das/tutorial/fileupload.aspx

it has everything.

:-)
Das.

----- Original Message -----
From: "Jacob Kruger" <Click here to reveal e-mail address>
To: "aspngfreeforall" <Click here to reveal e-mail address>
Sent: Wednesday, April 24, 2002 4:12 AM
Subject: [aspngfreeforall] File Upload Size Limit

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Filipe Clemente
Hi,

How do u treat the error when the user uploads a file that exceed the
maximum size?
I have already modified the machine.config file but when the user upload a
file that is greater than the limit it just gives the folowing error: "Page
not found".

Do u have any ideas about where we can handle the error when the limit is
exceded?

Thanks.

Filipe
Portugal

-----Original Message-----
From: Das [mailto:Click here to reveal e-mail address]
Sent: quarta-feira, 24 de Abril de 2002 14:22
To: aspngfreeforall
Subject: [aspngfreeforall] Re: File Upload Size Limit

Read my article at http://aspalliance.com/das/tutorial/fileupload.aspx

it has everything.

:-)
Das.

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To: "aspngfreeforall" <Click here to reveal e-mail address>
Sent: Wednesday, April 24, 2002 4:12 AM
Subject: [aspngfreeforall] File Upload Size Limit

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Das (VIP)
You have to use the Try...Catch...Mechanism to handle these type of
unexpected errors.

Try the following code

Try
myFile.PostedFile.SaveAs("c:\inetpub\wwwroot\yourwebapp\upload" &
strFileNameOnly)
lblMsg.Text = "File Upload Success."
lblFileContentType.Text = "Content type: " &
MyFile.PostedFile.ContentType
lblFileSize.Text = "File size: " & CStr(MyFile.PostedFile.ContentLength)
& "
Catch exc as exception
lblMsg.Text = "File Upload Failure: Error Details are as follows:
<br><br>" & exe.ToString()
Finally
' Clean up code goes here. We do not have any cleanup code in this
example.
End Try

To know more about the try...Catch...finally exception handling mechanism,
read my article at
http://aspalliance.com/das/trycatchfinally.aspx

:-)
Das.

----- Original Message -----
From: "Filipe Clemente" <Click here to reveal e-mail address>
To: "aspngfreeforall" <Click here to reveal e-mail address>
Sent: Wednesday, April 24, 2002 1:15 PM
Subject: [aspngfreeforall] Re: File Upload Size Limit

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Peter Ma
I use a Try-Catch block to catch the error, but I still can't upload the
file over 30Mb to web server under the same config. I still show me sth like
Time-out... Can you upload a oversize file successfully by modifying the
codes?
:(

Peter

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Das
I haven't tried uploading a 30 mb file.

As you are getting a timeout, you may need to increase the timeout for your
page. I believe, it is the same old
Server.ScriptTimeOut property to set the timeout in ASP .net

iN THE PAGE load event, give something like

Server.ScriptTimeOut = 1000, where 1000 is in seconds

Let us know, if this solves your puzzle.

Das.

----- Original Message -----
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To: "aspngfreeforall" <Click here to reveal e-mail address>
Sent: Wednesday, April 24, 2002 1:52 PM
Subject: [aspngfreeforall] Re: File Upload Size Limit

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Admin
It is my experience that if you upload a file that is too large then the
aspx code will not even execute so the try..catch is useless. All I can
suggest is perhaps some client-side code to check the size. How? No idea.
Or maybe there is a friendly .net way to tap into the isapi request to see
that it violates the max request size.

There are a lot of people out there wrapping this functionality in 'for
sale' controls - i have no idea how they achieve what you need but i can
only assume they do. Maybe worth checking out. And i'll give you a dollar
if you pass on the 'how' to me :)

Good luck.

-----Original Message-----
From: Das [mailto:Click here to reveal e-mail address]
Sent: 24 April 2002 18:36
To: aspngfreeforall
Subject: [aspngfreeforall] Re: File Upload Size Limit

You have to use the Try...Catch...Mechanism to handle these type of
unexpected errors.

Try the following code

Try
myFile.PostedFile.SaveAs("c:\inetpub\wwwroot\yourwebapp\upload" &
strFileNameOnly)
lblMsg.Text = "File Upload Success."
lblFileContentType.Text = "Content type: " &
MyFile.PostedFile.ContentType
lblFileSize.Text = "File size: " & CStr(MyFile.PostedFile.ContentLength)
& "
Catch exc as exception
lblMsg.Text = "File Upload Failure: Error Details are as follows:
<br><br>" & exe.ToString()
Finally
' Clean up code goes here. We do not have any cleanup code in this
example.
End Try

To know more about the try...Catch...finally exception handling mechanism,
read my article at
http://aspalliance.com/das/trycatchfinally.aspx

:-)
Das.

----- Original Message -----
From: "Filipe Clemente" <Click here to reveal e-mail address>
To: "aspngfreeforall" <Click here to reveal e-mail address>
Sent: Wednesday, April 24, 2002 1:15 PM
Subject: [aspngfreeforall] Re: File Upload Size Limit

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Ben Hyrman
Just a shot in the dark....but if you're hitting timeout errors, try
increasing the script timeout setting (I know it's in IIS for ASP, not a
clue for ASP.NET)

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Das
Oh Well, you can verify the size of the File that is to be attached before
Uploading itself,
and it is from the server side though.

IF MyFile.PostedFile.ContentLength > 1048576 Then
lblWarning.Text = "You cannot upload a file which is of more than 1 MB"
End If

So, are you looking for this kind of verification before any upload begins?
If so, can I have my dollar!!

:-)
Das.

----- Original Message -----
From: "Admin" <Click here to reveal e-mail address>
To: "aspngfreeforall" <Click here to reveal e-mail address>
Sent: Wednesday, April 24, 2002 2:39 PM
Subject: [aspngfreeforall] Re: File Upload Size Limit

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Admin
I'm no expert but I'll venture to say that you may not be correct about that
because the the file is already 'uploaded' before any .net code executes.
The file is sent as part of the request. But the problem is the request
fails because of the size. So that server code is of no use - you're
checking the contentlength of something that is already at the server (if it
ever gets to the server).

I'm a mean bugger and demanding too so you'll have to work much harder for
that dollar :)

Seriously though, i think this is a real problem that makes this kind of
uploading with http look lego-ish when compared to 'real' ftp!?

-----Original Message-----
From: Das [mailto:Click here to reveal e-mail address]
Sent: 24 April 2002 20:13
To: aspngfreeforall
Subject: [aspngfreeforall] Re: File Upload Size Limit

Oh Well, you can verify the size of the File that is to be attached before
Uploading itself,
and it is from the server side though.

IF MyFile.PostedFile.ContentLength > 1048576 Then
lblWarning.Text = "You cannot upload a file which is of more than 1 MB"
End If

So, are you looking for this kind of verification before any upload begins?
If so, can I have my dollar!!

:-)
Das.

----- Original Message -----
From: "Admin" <Click here to reveal e-mail address>
To: "aspngfreeforall" <Click here to reveal e-mail address>
Sent: Wednesday, April 24, 2002 2:39 PM
Subject: [aspngfreeforall] Re: File Upload Size Limit

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Little, Ambrose
Surely there's a way to request file size before actually uploading. I
mean, I've got a download manager that always tells me the size of the file
before downloading it (be it FTP or HTTP). Shouldn't similar functionality
be available on the receiving server's end of an upload?

--Ambrose

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Das
[Original message clipped]

No. The example that I have given

IF MyFile.PostedFile.ContentLength > 1048576 Then
lblWarning.Text = "You cannot upload a file which is of more than 1 MB"
End If

MyFile.PostedFile.ContentLength can be used even though if you have not
uploaded the file to the web server.
So, we are finding the size of the file without uploading to the web server.

Try this example

<example>

<html>
<head>
<script language="VB" runat="server">

Sub Upload(Source As Object, e As EventArgs)

If Not (myFile.PostedFile Is Nothing) Then
lblFileContentType.Text = "Content type: " &
MyFile.PostedFile.ContentType
lblFileSize.Text = "File size: " & CStr(MyFile.PostedFile.ContentLength)
& " bytes"
End If
End Sub
</script>

</head>
<body>

<h3>File Upload</h3>

<form enctype="multipart/form-data" runat="server">
File: <input id="myFile" type="file" runat="server">
<input type=button value="Upload" OnServerClick="Upload" runat="server">
<asp:label id=lblFileContentType runat="server" />
<asp:label id=lblFileSize runat="server" />
</form>

</body>
</html>

</example>

So, this solution works well

----- Original Message -----
From: "Admin" <Click here to reveal e-mail address>
To: "aspngfreeforall" <Click here to reveal e-mail address>
Sent: Wednesday, April 24, 2002 3:48 PM
Subject: [aspngfreeforall] Re: File Upload Size Limit

> I'm no expert but I'll venture to say that you may not be correct about
that
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TomMallard
Lego...good one...

For this problem, uploads can be screened by javascript on the client with a
function using the File object to get the size property value after the user
selects it in a <input type=file> box. You could then alert() a message to
the user that it's too big and not submit the page and return focus to the
input box instead.

tom mallard
seattle
-----Original Message-----
From: Admin [mailto:Click here to reveal e-mail address]
Sent: Wednesday, April 24, 2002 12:48 PM
To: aspngfreeforall
Subject: [aspngfreeforall] Re: File Upload Size Limit

I'm no expert but I'll venture to say that you may not be correct about that
because the the file is already 'uploaded' before any .net code executes.
The file is sent as part of the request. But the problem is the request
fails because of the size. So that server code is of no use - you're
checking the contentlength of something that is already at the server (if it
ever gets to the server).

I'm a mean bugger and demanding too so you'll have to work much harder for
that dollar :)

Seriously though, i think this is a real problem that makes this kind of
uploading with http look lego-ish when compared to 'real' ftp!?

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Ben Hyrman
It would seem that the only way to check pre-upload would be through
client-side code...However, Javascript doesn't allow access to the file
system, and ActiveX would need to be allowed by the browser (not to mention
it would have to be a browser that supports ActiveX).

There are a few well-published security holes for Netscape and IE that would
allow access to get the file size, but you don't really want to depend on
that as a good alternative.

I'll keep digging though...

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Ben Hyrman
Still digging, but here's a bit more...the process is outlined in RFC 1867
(http://www.ietf.org/rfc/rfc1867.txt), which claims to be obsoleted by RFC
2854...however RFC 2854 makes no mention of file upload so we'll go off of
1867.

In RFC 1867, it strongly suggests that browsers include the length of the
file in the overall content-length field of the http header. As this RFC
appeared in 1995, I'd hope that all browsers now do this.

So, the hard way would be to check the header yourself, the easy way would
be to use the wonderful code Das supplied ;-) and, if anyone wants more
details, chech out
http://msdn.microsoft.com/library/default.asp?url=/library/en-us/cpgenref/html/cpconhtmlinputfilecontrol.asp

Ben

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Admin
Hi Das,
I know I'm bugging everybody now. I was going to take this offline but i
think it is an important enough subject given the widespread use of this
seemingly 'useful yet simple' feature.

Again, I think you misunderstand me. See, for your code to access the
.PostedFile the file contents must already have been "posted" - ie. it's
already at the server. It has been 'uploaded' in the 'request' from the
client (the 'request' being "i want to upload this file please" and shoving
in your face before you can reply). It's in server-side memory and the
SaveAs method takes it from memory and persists it to disk (ie. your code).

The limitations only really raise their heads when the file is too big
because the server-side code never executes. I suppose you could set a huge
maximum file size allowable and use code like yours to see if a file is too
big for your application but this would be dangerous I'd imagine.

Anyway, that's me. Again.

And still clinging tightly to that dollar!

jh

-----Original Message-----
From: Das [mailto:Click here to reveal e-mail address]
Sent: 24 April 2002 22:16
To: aspngfreeforall
Subject: [aspngfreeforall] Re: File Upload Size Limit

[Original message clipped]

No. The example that I have given

IF MyFile.PostedFile.ContentLength > 1048576 Then
lblWarning.Text = "You cannot upload a file which is of more than 1 MB"
End If

MyFile.PostedFile.ContentLength can be used even though if you have not
uploaded the file to the web server.
So, we are finding the size of the file without uploading to the web server.

Try this example

<example>

<html>
<head>
<script language="VB" runat="server">

Sub Upload(Source As Object, e As EventArgs)

If Not (myFile.PostedFile Is Nothing) Then
lblFileContentType.Text = "Content type: " &
MyFile.PostedFile.ContentType
lblFileSize.Text = "File size: " & CStr(MyFile.PostedFile.ContentLength)
& " bytes"
End If
End Sub
</script>

</head>
<body>

<h3>File Upload</h3>

<form enctype="multipart/form-data" runat="server">
File: <input id="myFile" type="file" runat="server">
<input type=button value="Upload" OnServerClick="Upload" runat="server">
<asp:label id=lblFileContentType runat="server" />
<asp:label id=lblFileSize runat="server" />
</form>

</body>
</html>

</example>

So, this solution works well

----- Original Message -----
From: "Admin" <Click here to reveal e-mail address>
To: "aspngfreeforall" <Click here to reveal e-mail address>
Sent: Wednesday, April 24, 2002 3:48 PM
Subject: [aspngfreeforall] Re: File Upload Size Limit

> I'm no expert but I'll venture to say that you may not be correct about
that
[Original message clipped]

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Ben Hyrman
I'm not so sure....

It could be possible that the code from Das will check the content-length of
the header once the header is received by the server _but_ before the upload
is started (or at least significantly underway). The file doesn't actually
get included into the http post until a bit later...which would give the
server plenty of time to abandon the connection and send some sort of
graceful error to the client.

I suppose there's really only a couple ways to validate this...and no one
from the MS .NET development group seems to be chiming in....so it's time to
do some more digging and testing. I'll post again once I figure out the
sequencing...

To get around standard users, I would utilize the built-in size constraint
of the form field. To get around somewhat sneaky users, check the size
server-side in what, I assume, is a method that checks size based on
content-length before the upload begins. To get around wiley users...well,
I'm not sure yet. To get around any file size limitations...well, if you
really need to send large files, use a protocol designed for sending large
files ;-)

Ben

----- Original Message -----
From: "Admin" <Click here to reveal e-mail address>
To: "aspngfreeforall" <Click here to reveal e-mail address>
Sent: Wednesday, April 24, 2002 4:39 PM
Subject: [aspngfreeforall] Re: File Upload Size Limit

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Jacob Kruger
You can catch the problem ocurring using the Application_BeginRequest
event in the global.asax file, but no matter what I try put in there, it
still seems to generate the same DNS error.

Tried this:

Sub Application_BeginRequest(ByVal sender As Object, ByVal e As
EventArgs)
' Fires at the beginning of each request
If Request.ContentLength > 2048 Then
Response.Clear()
Response.Redirect("test.htm")
End If
End Sub

Jacob Kruger
Web Developer
Click here to reveal e-mail address

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Filipe Clemente
Hi,

I started this discussion about how to handle the uploaded file size error
when the maximum size is reached. Yesterday I wasn't here to discuss because
here in Portugal we had a holiday ... :)
I agree entirely with jh ... The code Das posted assume that the file was
entirely received by IIS and so the size has to be below the maximum size.
When u go to "MyFile.PostedFile.ContentLength" the file was already
uploaded. U can choose if u save it or not but it have already passed the
check for maximum size.

So I think only guys from Microsoft can help us on how to handle this error.
I don't know if anyone of them read this list but it would be great if they
could make some "light" on this matter ....

Thanks for your interest.

Filipe
Portugal

-----Original Message-----
From: Admin [mailto:Click here to reveal e-mail address]
Sent: quinta-feira, 25 de Abril de 2002 0:40
To: aspngfreeforall
Subject: [aspngfreeforall] Re: File Upload Size Limit

Hi Das,
I know I'm bugging everybody now. I was going to take this offline but i
think it is an important enough subject given the widespread use of this
seemingly 'useful yet simple' feature.

Again, I think you misunderstand me. See, for your code to access the
.PostedFile the file contents must already have been "posted" - ie. it's
already at the server. It has been 'uploaded' in the 'request' from the
client (the 'request' being "i want to upload this file please" and shoving
in your face before you can reply). It's in server-side memory and the
SaveAs method takes it from memory and persists it to disk (ie. your code).

The limitations only really raise their heads when the file is too big
because the server-side code never executes. I suppose you could set a huge
maximum file size allowable and use code like yours to see if a file is too
big for your application but this would be dangerous I'd imagine.

Anyway, that's me. Again.

And still clinging tightly to that dollar!

jh

-----Original Message-----
From: Das [mailto:Click here to reveal e-mail address]
Sent: 24 April 2002 22:16
To: aspngfreeforall
Subject: [aspngfreeforall] Re: File Upload Size Limit

[Original message clipped]

No. The example that I have given

IF MyFile.PostedFile.ContentLength > 1048576 Then
lblWarning.Text = "You cannot upload a file which is of more than 1 MB"
End If

MyFile.PostedFile.ContentLength can be used even though if you have not
uploaded the file to the web server. So, we are finding the size of the file
without uploading to the web server.

Try this example

<example>

<html>
<head>
<script language="VB" runat="server">

Sub Upload(Source As Object, e As EventArgs)

If Not (myFile.PostedFile Is Nothing) Then
lblFileContentType.Text = "Content type: " &
MyFile.PostedFile.ContentType
lblFileSize.Text = "File size: " & CStr(MyFile.PostedFile.ContentLength)
& " bytes"
End If
End Sub
</script>

</head>
<body>

<h3>File Upload</h3>

<form enctype="multipart/form-data" runat="server">
File: <input id="myFile" type="file" runat="server">
<input type=button value="Upload" OnServerClick="Upload" runat="server">
<asp:label id=lblFileContentType runat="server" />
<asp:label id=lblFileSize runat="server" />
</form>

</body>
</html>

</example>

So, this solution works well

----- Original Message -----
From: "Admin" <Click here to reveal e-mail address>
To: "aspngfreeforall" <Click here to reveal e-mail address>
Sent: Wednesday, April 24, 2002 3:48 PM
Subject: [aspngfreeforall] Re: File Upload Size Limit

[Original message clipped]

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Ben Hyrman
All,

This appears to be easily enough proven out through a quick bit of test
code.

While not exactly conclusive or scientific...:

Startupload.innertext=system.datetime.now()
Startgetcontentsize.innertext=system.datetime.now()
ContentLength.InnerHtml = cStr(MyFile.PostedFile.ContentLength)
Endgetcontentsize.innertext=system.datetime.now()
startsave.innertext=system.datetime.now()
MyFile.PostedFile.SaveAs("c:\uploads\upload.tmp")
endsave.innertext=system.datetime.now()
endupload.innertext=system.datetime.now()

The above indicates that all events happen within the same second....and,
even on an upload to my web server running on this box, I know that
uploading a 1 MB file doesn't take 1 second....

I'll bet that this all could be solved through a custom handler...but,
frankly, a dollar isn't worth that kind of effort ;-)

Ben

----- Original Message -----
From: "Filipe Clemente" <Click here to reveal e-mail address>
To: "aspngfreeforall" <Click here to reveal e-mail address>
Sent: Friday, April 26, 2002 1:58 AM
Subject: [aspngfreeforall] Re: File Upload Size Limit

[Original message clipped]

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Verinder Bindra
-- Moved from [aspngvs] to [aspngfreeforall] by Dana Coffey <Click here to reveal e-mail address> --

i have one asp.net page with five <input type=file > element..
I am giving permission only to upload gif and jpg files..
problem is Everything works fine if file size is under 1.23 MB. If it
exceeds then I don't even receive http post back on the server side..

Any Idea

regard's
verinder

-----Original Message-----
From: Jacob Grass [mailto:Click here to reveal e-mail address]
Sent: Thursday, May 09, 2002 11:14 AM
To: aspngvs
Subject: [aspngvs] RE: Creating Custom Designer Controls

Ambrose-

Okay, I was confused as to what you were doing. You are looking for
enhanced "design-time" support for your web control. I don't believe that
TypeConverters and UITypeEditors are specific to Windows Forms. To create
your dropdown list, you would probably create a custom TypeConverter. For a
GUI you would create a UITypeEditor. Here is an article that gives great
coverage of this stuff. It's Windows Forms, but I can't think of why it
wouldn't translate. . .

http://msdn.microsoft.com/library/default.asp?url=/library/en-us/dndotnet/ht
ml/vsnetpropbrow.asp

Jacob A. Grass

[Original message clipped]

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leon jollans

I had a similar problem with a single field where I couldn't upload =
anything over 4 meg. I had to stick the tag below inside a system.web =
tag in the web.config file.

<httpRuntime executionTimeout=3D"600" maxRequestLength=3D"8192"/>

You'll need to set the executionTimeout as well as the maxRequestLength =
as there's nothing more annoying than getting 5 meg into an upload to =
timeout. well, maybe some things :/

The default settings are 4 meg maxRequest and about 60 seconds timeout I =
think.

hth.

L

-----Original Message-----
From: Verinder Bindra [mailto:Click here to reveal e-mail address]
Sent: 09 May 2002 17:09
To: aspngfreeforall
Subject: [aspngfreeforall] file upload size limit

-- Moved from [aspngvs] to [aspngfreeforall] by Dana Coffey =
<Click here to reveal e-mail address> --

i have one asp.net page with five <input type=3Dfile > element..
I am giving permission only to upload gif and jpg files..=20
problem is Everything works fine if file size is under 1.23 MB. If it
exceeds then I don't even receive http post back on the server side..

Any Idea

regard's
verinder

-----Original Message-----
From: Jacob Grass [mailto:Click here to reveal e-mail address]
Sent: Thursday, May 09, 2002 11:14 AM
To: aspngvs
Subject: [aspngvs] RE: Creating Custom Designer Controls

Ambrose-

Okay, I was confused as to what you were doing. You are looking for
enhanced "design-time" support for your web control. I don't believe =
that
TypeConverters and UITypeEditors are specific to Windows Forms. To =
create
your dropdown list, you would probably create a custom TypeConverter. =
For a
GUI you would create a UITypeEditor. Here is an article that gives =
great
coverage of this stuff. It's Windows Forms, but I can't think of why =
it
wouldn't translate. . .=20

http://msdn.microsoft.com/library/default.asp?url=3D/library/en-us/dndotn=
et/ht
ml/vsnetpropbrow.asp

Jacob A. Grass

=20

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System.ComponentModel.TypeConverter
System.Drawing.Design.UITypeEditor
System.EventArgs
System.Web.HttpPostedFile
System.Web.UI.Control
System.Windows.Forms.PropertyGrid




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