ASP.NET

Re: null is not null error

23-Sep-09 6:47

When you are getting this error ?

Abhijit Jana | Codeproject MVP
Web Site : abhijitjana.net
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Abhishek Sur23-Sep-09 9:18

DLL Files Usage in Web Application.

23-Sep-09 9:18

This is the patent NullReference error that comes to the browser.
There might happen when a script is loaded which might be calling a control before actually its been rendered in the document.

Thus it is always recommended to place a script either in an event.. if not any control event, use document.onload or place it below body tag.

In your case, I think the html output is not rendered properly. Make sure that Crystal Report dlls are properly installed in the web server and has access to them.
Smile | :)

Abhishek Sur

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VikashGohil23-Sep-09 4:04

23-Sep-09 4:04

Hello,

I am Vikash Gohil.

I have a Query related to DLL files Usage in my Web Application.

I have a USB Device which reads Smart Cards and Stores Data from these cards in its memory.

Using a Windows Application which uses a DLL file, I can retrieve Data from that USB Device.

The DLL files have functions for Accessing/Controlling the USB Device.

Now I want the same functionality from a Web-Application.

ie, the WebApp will be run in Intranet environment with the App loaded on WebServer.

Now where do I need to put the Device DLL files that my Code uses for Controlling Device.

The Device is Connected to a USB port on Client PC.

So How can access the USB device on client PC, from Web browser running my web app.

Please Help me, I am a Newbee in Web Development.

Please Any help would be greatly appreciated.

Thanks In aDvance

Abhishek Sur23-Sep-09 9:26

23-Sep-09 9:26

Check this :
http://www.codeproject.com/Messages/3192977/Re-DLL-Files-in-ASP-net-Website.aspx[^]

Why post the same question again ?? Laugh | :laugh:

Abhishek Sur

My Latest Articles
Create CLR objects in SQL Server 2005
C# Uncommon Keywords
Read/Write Excel using OleDB
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VikashGohil23-Sep-09 19:38

23-Sep-09 19:38

Well Sorry for opening a new post,

Actually Abhishek, the earlier post was for devices Connected in LAN and this one is for Accessing a USB Device on Client PC,

might be the Subjects are same, sorry.

So any idea how can I access a USB device using it's DLL that is connected to Client PC from Browser.

The Client PC has all the necessary drivers and DLL files installed required to use the device.

Any Idea from anyone.

Abhishek Sur23-Sep-09 23:02

23-Sep-09 23:02

Hey... no big deal.. You can open as many post you want. The question should be different.

On this matter, I would like to say if you want to access your usb device from client pc without any driver installed.. it wont be done. Through website you can only transfer base64 data which has some limits.

You can make a browser plugin I guess... if you require this... provided the clients should download your plugin and install it to their machine.

I hope you got the problem clearly. D'Oh! | :doh:

Cheers.

Abhishek Sur

My Latest Articles
Create CLR objects in SQL Server 2005
C# Uncommon Keywords
Read/Write Excel using OleDB
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VikashGohil25-Sep-09 3:05

25-Sep-09 3:05

Hello, Abhishek.

Thanks for your reply.

Actually I would have everything Installed on Client PC ie, the Drivers for USB Device and Even my DLL file registered on Client PC.

Any way I was just thinking whether this Could be done through VBScript.

I have written a DLL file in which there are functions that Uses the Main DLL file.

I have registered the DLL on My PC. Also written a VBScript. But the Script is not working properly.

When Calling the function from a Windows App, gives me proper output.

But when run from VB script gives me improper results.

There are not errors, but results are not as expected.

Can you tell me why this Mismatch, when run from VB App runs perfectly OK, and on the same machine run using VBScript wrong results.

Also abhishek, you were talking about Plugins, could you give me more information on that, like how to use it, create it etc. Would be of great help, I had come to know of plugins but have no idea how to go about it.

Please any help would be great.

Abhishek Sur25-Sep-09 10:33

25-Sep-09 10:33

As VBscript doesnt work in browsers other than IE, it would be bad to do programming in VBscript.
And hey, if you are to install all the drivers in cleint pc why do you need to make use of browser. Why dont you use Windows program to do this job.

The web environment is only for those who are in remote areas and doesnt need to install any software.
You can use Windows application and use Remoting / WCF / Web service to communicate with the server as well.

Abhishek Sur

My Latest Articles
Create CLR objects in SQL Server 2005
C# Uncommon Keywords
Read/Write Excel using OleDB
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VikashGohil26-Sep-09 19:13

HttpWebResponse.GetResponse(); The operation has timed-out

26-Sep-09 19:13

Thanks Abhishek for your reply.

Well, Abhishek, you are right but it's a Clients requirement that the application should be Web-Based.

Also we are going for it bcoz in todays world everything is bcoming web-based, so it's necessary to be with the world other wise your competitors would leave u behind.

OK now back to the topic. See I have successfully written a VBscript to access a Card reader on clients PC using browser.

Now I have another query.

I have another USB device. To use this device, the manufacturer has provided a .OCX file.

So in windows app, I register my OCX and I can see a control in the ToolBox which I drop on a Form and use the USB device using this Control.

Now this Control works on Events and the USB device is a FingerPrint Reader.

When I place my Finger on the Reader it generates an Event which is Captured by my Windows App(bcoz of OCX Control on the Form) and I get the FingerPrint Data.

Now How Can I Achieve this in VBScript in my Web-Page.

Hope you understand my explaination.

Any Ideas.

livez23-Sep-09 3:51

livez

23-Sep-09 3:51

Hello!

We run this code to get xml for an example from uri´s

 <br />
try<br />
            {<br />
                HttpWebRequest webRequest = (HttpWebRequest)WebRequest.Create(requestUriString);<br />
<br />
                webRequest.Timeout = timeOut;<br />
<br />
                HttpWebResponse webResponse = (HttpWebResponse)webRequest.GetResponse();<br />
<br />
                return new StreamReader(webResponse.GetResponseStream(), encoding);<br />
            }<br />
            catch(WebException e)<br />
            {<br />
LogError(e);<br />
return null;<br />
}<br />
<br />

We keep getting alot of "The operation has timed-out"-exceptions thrown. Is there something we are missing when we are setting up the webRequest object? For instance, should we set ReadWriteTimeout?

/regards

W

Re: HttpWebResponse.GetResponse(); The operation has timed-out

sashidhar23-Sep-09 5:57

sashidhar

23-Sep-09 5:57

You Are not getting the request from the site.It Will wait for some time. if it is not recieving the request for particular time it will throw this error.
Check the link it May Help
http://www.codeproject.com/Messages/3208439/Re-Post-an-HTTP-Request-from-one-WebServer-to-anot.aspx[^]

If It Helps Click It as Answer

Re: HttpWebResponse.GetResponse(); The operation has timed-out

Abhishek Sur23-Sep-09 9:34

Re: HttpWebResponse.GetResponse(); The operation has timed-out

23-Sep-09 9:34

Where you mentioned webRequest.Method

Other than that the code seems to be alright. If still errors out, open a web browser, paste the requestUriString to the address bar and see if the page response is within the Timeout limit... Smile | :)

Cheers

Abhishek Sur

My Latest Articles
Create CLR objects in SQL Server 2005
C# Uncommon Keywords
Read/Write Excel using OleDB
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livez24-Sep-09 20:20

livez

24-Sep-09 20:20

Thank you both for your responses! I will try your suggestions.

how to make text box mandatory on dropdown change

NK723-Sep-09 3:26

NK7

23-Sep-09 3:26

Hi
I have one dropdown contain status information.

Status are

1. Finished
2. Open
3. Progress

Also one date textbox.

I want to set the text box is editable and mandatory when i select the status as finished in the dropdown. Otherwise it should accept null values(not mandatory) and read only.

Can any one help me please. its urgent. It should be in C# or java script

Regards
K7

kesavan

Re: how to make text box mandatory on dropdown change

J4amieC23-Sep-09 3:36

J4amieC

23-Sep-09 3:36

I would have a requiredfieldvaliadtor on the textbox (and perhaps a regularexpressionvalidator too to ensure a date is entered) but set enabled to false. Then, when the user selects "FInished" from the dropdown, enable the validators.

Re: how to make text box mandatory on dropdown change

Abhijit Jana23-Sep-09 3:38

How to add Databse in App_data folder

23-Sep-09 3:38

You can simply implement it using AJAX Update Panel or JavaScript. You need to check the Selected value from dropdown list, and based on that you have enable/disable the Textbox. To avoid the un-necessary postback you have to use AJAX Updatepanel or Javscript Smile | :)

Abhijit Jana | Codeproject MVP
Web Site : abhijitjana.net
Don't forget to click "Good Answer" on the post(s) that helped you.

rinku soni 2323-Sep-09 3:10

rinku soni 23

23-Sep-09 3:10

Hello every one,i have a (mysql) database name "classified" in my computer.i want to add this in App_data folder.how to do this .

Re: Cross Post : Please Ignore

Abhijit Jana23-Sep-09 3:17

Instead of http://localhost:3112/ I need to use the Current servername

23-Sep-09 3:17

Please don't Cross post ! Dead | X|

Abhijit Jana | Codeproject MVP
Web Site : abhijitjana.net
Don't forget to click "Good Answer" on the post(s) that helped you.

getaccessyr23-Sep-09 3:09

getaccessyr

23-Sep-09 3:09

Hi All,

In my Application we are using flash files,in that if we click on the flash image it should redirect to another page in new window,so to do that we are doing like this:

string sFlashObject = "<object classid=\"clsid:D27CDB6E-AE6D-11cf-96B8-444553540000\" codebase=\"http://download.macromedia.com/pub/shockwave/cabs/flash/swflash.cab#version=6,0,65,0\" height=\"195\" width=\"220\"> " + "<param name=\"movie\" value=\"http://ebutler.be/erez/fsi/fsi.swf?autobooklet=true&src=http://www.ebutler.be/erez&pages_dir=" + hfImageFilePath.Value + "&cfg=pages_presets/thumbnail.fsi&MouseModes_Mode2=0&

pages_demourl=http://localhost:3112/UI/FSIViewer.aspx?FolderID%3d" + hfFolderId.Value +

"&pages_demourltarget=_new\"> " +
"<param name=\"wmode\" value=\"transparent\"> " +
"<embed type=\"application/x-shockwave-flash\" pluginspage=\"http://www.adobe.com/shockwave/download/download.cgi?P1_Prod_Version=ShockwaveFlash\" wmode=\"transparent\" src=\"http://ebutler.be/erez/fsi/fsi.swf?autobookletId=true&src=http://www.ebutler.be/erez&pages_dir=" + hfImageFilePath.Value + "&cfg=pages_presets/thumbnail.fsi&MouseModes_Mode2=0&
pages_demourl=http:///localhost:3112/UI/FSIViewer.aspx?FolderID%3d" + hfFolderId.Value +

"&pages_demourltarget=_new\" height=\"195\" width=\"220\"> " +
"</object>";

In the above script you can notice that i gave demourl as:
"http:///localhost:3112 /UI/FSIViewer.aspx?FolderID%3d"

Instead of this i need to show Servername where ever we open the application

Thanks In Advance
Yamuna

Re: Instead of http://localhost:3112/ I need to use the Current servername

Nisha Agrawal23-Sep-09 3:18

Nisha Agrawal

23-Sep-09 3:18

you can get the value of Current Server via Request.Url after some string manipulations. Request.Url.toString() will give you the URl of the current webpage request so via string manipulations you can get the name of the server.

Re: Instead of http://localhost:3112/ I need to use the Current servername

Abhijit Jana23-Sep-09 3:19

Re: Instead of http://localhost:3112/ I need to use the Current servername

23-Sep-09 3:19

First of all, you code is nota understandable at all.

yamunarani wrote:
pages_demourl=http://localhost:3112/UI/FSIViewer.aspx?FolderID%3d" + hfFolderId.Value +

What about this one,

pages_demourl="/UI/FSIViewer.aspx?FolderID%3d" + hfFolderId.Value +;

Abhijit Jana | Codeproject MVP
Web Site : abhijitjana.net
Don't forget to click "Good Answer" on the post(s) that helped you.

getaccessyr23-Sep-09 3:41

getaccessyr

23-Sep-09 3:41

Hi Abhijit,

Thanks for your reply

We are using FSI viewer in Our application so we are using the Code which i posted in the message

if you want you can view the Message again.To bind the image dynamically we have to use that code.

If u want explanation about FSI viewer i will give you not understood.

Instead of http://localhost:3112/ this i need to use <servername> that too dynamically i have to get.

regards,
Yamuna

Re: Instead of http://localhost:3112/ I need to use the Current servername

Abhishek Sur23-Sep-09 10:06