Re: Error Use of unassigned local variable 'ClientScript' - ASP.NET Discussion Boards

Abhishek Sur10-Sep-09 9:40

10-Sep-09 9:40

Hey, First of all, I should clear you that Web and Windows are something different.
In case of windows, the dlls are read using Reflection or COM based approaches.
In case of Web, browser only identifies what mentioned in w3 standards. These are basically XML, Javascript, CSS etc.
If you want your web application to read your custom dll interface, you need to create your own custom activeX/browser plugin which the user is forced to install in the client computer and then use the interface...

Basically if you are forcing the client to install browser plugins, you might somehow loose lots of your clients, because most of the people dont want plugins getting installed. Also this means you need to make a setup and which checks the browser and installs the plugin accordingly. This is not easy to do.

Even if you write XBAP applications, it has security issues to read external device data from it.

Also I think you mentioned you will be using the software in LAN. So why not you access the device from the server side. You can access any device from the server side easily and send the data back to the client. Use almost the same code that you use in windows in the server side to get data. Cool | :cool:

Abhishek Sur

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Re: DLL Files in ASP.net Website

VikashGohil11-Sep-09 7:12

VikashGohil

11-Sep-09 7:12

Hello, Abhishek.

Thanks for your reply.

I have a query, What do you mean by saying Server-Side. Can you elaborate a bit.

See, the Web App is currently running on my PC in IIS6.0 and WinXP.

And regd. LAN issue, I am using this web App in LAN only.

So whether I use on my PC or any other PC, Both PC's and Device are in LAN.

Re: DLL Files in ASP.net Website

Abhishek Sur11-Sep-09 12:01

Abhishek Sur

11-Sep-09 12:01

Hey,
Let me clear you a bit. Whenever we talk about WEB there are 2 computers involved. One is server, where IIS is running, and the other is Calling Computer, which uses only browser to get the output.
It is very easier to add dll in the server side, or API calls from the server computer, but 30 times tough if you want it from the client using Browser.

If you have an option so that you can connect the device through LAN using network from your server, then its just paste the code that your windows program has(slight alteration might be needed) and get the work done easily. But if you want the client computer to use the lan, it would be quite impossible (At least have to create Browser plugin for API calls)

Hope you got my point. Rose | [Rose]

Abhishek Sur

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Error Use of unassigned local variable 'ClientScript'

Md. Marufuzzaman10-Sep-09 3:26

Md. Marufuzzaman

10-Sep-09 3:26

I want to popup an aspx page from a function using the following code..

string strScript = null;
ClientScriptManager ClientScript;
strScript = "window.open('popupContent.aspx','new_Win','height=650,width=250,resizable=0')";
ClientScript.RegisterClientScriptBlock(this.GetType(), "popup", strScript, true);

But it's not allow me to compile..showing that
Error Use of unassigned local variable 'ClientScript'

How can i resolve this?

Thanks
Md. Marufuzzaman

Re: Error Use of unassigned local variable 'ClientScript'

Manas Bhardwaj10-Sep-09 3:52

Manas Bhardwaj

10-Sep-09 3:52

string strScript = null;
ClientScriptManager ClientScript;
strScript = "window.open('popupContent.aspx','new_Win','height=650,width=250,resizable=0')";
this.ClientScript.RegisterClientScriptBlock(this.GetType(), "popup", strScript, true);

You do not need to define a new client script manager. Page class already has one Smile | :)

Manas Bhardwaj
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Re: Error Use of unassigned local variable 'ClientScript'

Md. Marufuzzaman10-Sep-09 4:14

Md. Marufuzzaman

10-Sep-09 4:14

Thanks for your help... but when i try as you suggest i get another error..

Error 1 ' does not contain a definition for 'ClientScript' and no extension method 'ClientScript' accepting a first argument of type 'GUInterface.SqlManager' could be found (are you missing a using directive or an assembly reference?)

I dont know why....

I will not say I have failed 1000 times; I will say that I have discovered 1000 ways that can cause failure – Thomas Edison.

Don't forget to click [Vote] / [Good Answer] on the post(s) that helped you.

Thanks
Md. Marufuzzaman

Re: Error Use of unassigned local variable 'ClientScript'

Zoki Manas10-Sep-09 3:54

Zoki Manas

10-Sep-09 3:54

Small change in your code:

string strScript = null;
ClientScriptManager ClientScript = Page.ClientScript;
strScript = "window.open('popupContent.aspx','new_Win','height=650,width=250,resizable=0')";
ClientScript.RegisterClientScriptBlock(this.GetType(), "popup", strScript, true);

View line number 2.

Re: Error Use of unassigned local variable 'ClientScript'

Manas Bhardwaj10-Sep-09 4:01

Manas Bhardwaj

10-Sep-09 4:01

Zoki Manas wrote:
ClientScriptManager ClientScript = Page.ClientScript;

Why to create a new object unnecesarily ?

Btw, I noticed your last name is Manas. Smile | :)

In Hindi, it means some one who is very close to heart. What does it mean in your language?

Manas Bhardwaj
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Re: Error Use of unassigned local variable 'ClientScript'

Abhijit Jana10-Sep-09 5:14

Abhijit Jana

10-Sep-09 5:14

Manas Bhardwaj wrote:
it means some one who is very close to heart

Abhijit Jana | Codeproject MVP
Web Site : abhijitjana.net
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Re: Error Use of unassigned local variable 'ClientScript'

J4amieC10-Sep-09 6:05

J4amieC

10-Sep-09 6:05

Manas Bhardwaj wrote:
Why to create a new object unnecesarily ?

There's no object created there... just a reference to one which already exists on the Page class.

Re: Error Use of unassigned local variable 'ClientScript'

N a v a n e e t h10-Sep-09 6:10

N a v a n e e t h

10-Sep-09 6:10

Manas Bhardwaj wrote:
Why to create a new object unnecesarily ?

There is no harm in doing so.

Navaneeth

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Re: Error Use of unassigned local variable 'ClientScript'

Abhishek Sur10-Sep-09 11:21

Abhishek Sur

10-Sep-09 11:21

Hey manas, as everybody else suggested... Referring to a variable to the same object doesnt actually create a variable. Rather it just places the pointer to the same variable if the reference is derived from Object.

If its Value Types this would be different. Thus

ClientScriptManager ClientScript = Page.ClientScript
ClientScript.RegisterClientScriptBlock is same as
Page.ClientScript.RegisterScriptBlock

Manas Bhardwaj wrote:
In Hindi, it means some one who is very close to heart. What does it mean in your language?

In my language it means "Worship to God" Big Grin | :-D

.

Cheers. Rose | [Rose]

Abhishek Sur

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Create CLR objects in SQL Server 2005
C# Uncommon Keywords
Read/Write Excel using OleDB
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Re: Error Use of unassigned local variable 'ClientScript'

Abhishek Sur10-Sep-09 5:10

Abhishek Sur

10-Sep-09 5:10

Rather than using RegisterClientScriptBlock, it is better to use RegisterStarupScript

use

if(!this.ClientScript.IsClientScriptBlockRegistered("myscript"))
this.ClientScript.RegisterStartupScript(this.GetType(), "myscript", strScript , true);

Hope this helps. Rose | [Rose]

Abhishek Sur

My Latest Articles
Create CLR objects in SQL Server 2005
C# Uncommon Keywords
Read/Write Excel using OleDB
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Re: Error Use of unassigned local variable 'ClientScript'

Md. Marufuzzaman10-Sep-09 5:27

Md. Marufuzzaman

10-Sep-09 5:27

Thanks.. Could you please tell me why RegisterStarupScript is better rather then the RegisterClientScriptBlock

I will not say I have failed 1000 times; I will say that I have discovered 1000 ways that can cause failure – Thomas Edison.

Don't forget to click [Vote] / [Good Answer] on the post(s) that helped you.

Thanks
Md. Marufuzzaman

Re: Error Use of unassigned local variable 'ClientScript'

Abhijit Jana10-Sep-09 5:33

Abhijit Jana

10-Sep-09 5:33

Make sure one things : if you have AJAX Script Manager in your page, then you have to use ScriptManager rather than ClientScript. Smile | :)

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

Re: Error Use of unassigned local variable 'ClientScript'

Md. Marufuzzaman10-Sep-09 5:55

Md. Marufuzzaman

10-Sep-09 5:55

Thanks for sharing... Smile | :)

I will not say I have failed 1000 times; I will say that I have discovered 1000 ways that can cause failure – Thomas Edison.

Don't forget to click [Vote] / [Good Answer] on the post(s) that helped you.

Thanks
Md. Marufuzzaman

Re: Error Use of unassigned local variable 'ClientScript'

Abhishek Sur10-Sep-09 9:04

Abhishek Sur

10-Sep-09 9:04

Yes... RegisterStartupScript places the script after all the objects are rendered while RegisterClientScriptBlock places the JS at the beginning.

Thus say you are calling a javascript using RegisterClientScriptBlock which gets an element, you will find this null, as the script gets executed just before any html is rendered. In case of RegisterStartupScript the script is placed after the html is generated. So If you want to place a javascript call in your html, always use RegisterStartupScript.

Hope you got it. If not I can give you examples. Smile | :)

Abhishek Sur

My Latest Articles
Create CLR objects in SQL Server 2005
C# Uncommon Keywords
Read/Write Excel using OleDB
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Re: Error Use of unassigned local variable 'ClientScript'

Md. Marufuzzaman10-Sep-09 19:58

Md. Marufuzzaman

10-Sep-09 19:58

Thanks for your excellent explanation.. Smile | :)

I will not say I have failed 1000 times; I will say that I have discovered 1000 ways that can cause failure – Thomas Edison.

Don't forget to click [Vote] / [Good Answer] on the post(s) that helped you.

Thanks
Md. Marufuzzaman

Re: Error Use of unassigned local variable 'ClientScript'

Abhishek Sur10-Sep-09 22:14

Abhishek Sur

10-Sep-09 22:14

you are most welcome ... budd Cool | :cool:

Abhishek Sur

My Latest Articles
Create CLR objects in SQL Server 2005
C# Uncommon Keywords
Read/Write Excel using OleDB
Don't forget to click "Good Answer" if you like to.

Input values are lost in postback

smraj150310-Sep-09 1:51

smraj1503

10-Sep-09 1:51

I download a template in online and design my site and i finish my site. When i run IE it does not work button clicks and textbox input values and dropdownlist selected values and every values will be lost postback but it will work properly in firefox what is this error...give any solution to this problem...

Thanks in advance...

Re: Input values are lost in postback

sashidhar10-Sep-09 1:53

sashidhar

10-Sep-09 1:53