Read files through Javascript

I Came across a scenario, i.e, as follows


1) An ASP.Net application is configured in a server.
2) I need to open a file from client side in a text area(the file can be any type)
3) I can modify it
4) I need to save the modifications in the same path of client


Here we can’t open the file in Fileupload control, since it uploads the file to the server location. The modified file can’t be save in the clients location.
So, I went for Javascript. I just copy a code for illustration

<form id="form1" runat="server">
<div>
<input type=text id="txtFile" /><input type="button" id="btnSub" value="Open" onclick="ReadFiles();" />
</p>
 <textarea id="txtFileData" name="S1"></textarea></div>
</form>


<script>
function ReadFiles()
{
var txt=document.getElementById('txtFile').value;
var fso, f1, ts, s;
var ForReading = 1;
fso = new ActiveXObject("Scripting.FileSystemObject");
ts = fso.OpenTextFile(txt, ForReading);
s = ts.ReadLine();
while(!ts.AtEndOfStream)
{
s=s + ts.ReadLine();
}


document.getElementById('txtFileData').value=s;
ts.Close();
}

</script>

But here the Browser settings should enable the activeX objects.

Thread abort exception

While working with an asp.net application, I came across a ThreadAbort Exception at Response.End statement.

Cause of this issue is:

The Response.End method ends the page execution and shifts the execution to the Application_End Request event in the application's event pipeline. The line of code that follows Response.End is not executed.

Same issue occurs in Response.Redirect & Server.Transfer (Since Response.End is called internally for these methods).

Remedies provided by microsoft are as follows.

1) Use HttpContext.Current.ApplicationInstance.CompleteRequest method instead of Response.End to bypass the code execution to the Application_End Request event.

2) For Response.Redirect, use an overload, Response.Redirect(String url, bool endResponse) that passes false for the endResponse parameter to suppress the internal call to Response.End.
Example
Code:

Response.Redirect ("Default.aspx", false);


3) Use Server.Execute method instead of Server.Transfer

Lessons Learned


1)Always use the overloaded method of Response.Redirect and use false for end response
2)Use HttpContext.Current.ApplicationInstance.CompleteRequest instead of Respons.End
3)Use Server.Execute method instead of Server.Transfer

Tips to improve performance for an asp.net application

1) Use Connection Pooling and Object Pooling
2) Turn off Tracing unless until required
3) Turn off Session State, if not required
4) Disable View State of a Page if possible
5) Set debug=false in web.config
6) Avoid Response.Redirect as many places
7) Use the String builder to concatenate string
8) Avoid throwing exceptions
9) Use Finally Method to kill resources
10) Use Client Side Scripts for validations
11) Avoid unnecessary round trips to the server
12) Use Gzip Compression
13) Use Page Output Caching and Proxy Servers
14) Use Per-Request Caching
15) Use Page.ISPostBack
16) Include Return Statements with in the Function/Method
17) Use Foreach loop instead of For loop for String Iteration
18) Include Return Statements with in the Function/Method
19) Avoid Unnecessary Indirection
20) Use "ArrayLists" in place of arrays
21) Always check Page.IsValid when using Validator Controls
22) Use custom Paging
23) Store your content by using caching
24) Use low cost authentication
25) Minimize the number of web server controls
26) Avoid using unmanaged code
27) Return Multiple Resultsets
28) Avoid making frequent calls across processes
29) Cleaning Up Style Sheets and Script Files
30) Design with ValueTypes
31) Minimize assemblies
32) Encode Using ASCII When You Don't Need UTF
33) Avoid Recursive Functions / Nested Loops
34) Minimize the Use of Format ()
35) Place StyleSheets into the Header
36) Put Scripts to the end of Document
37) Make JavaScript and CSS External
38) Use DataReader instead of Dataset
39) Make Enableviewstate property as false for the components(particularly for heavy items like datagrid, datalist etc) if it is not necessary.
40) Use xmlhttprequest object or scriptmanager to minimize post backs.

Cookies safety

Cookies can be accessed from the client side using document.cookie. The information can be tampered by this. In order to avoid misusing this security features Microsoft came up with a solution.

A tag in the web.config file as follows will disable this.

<httpCookies domain="String" httpOnlyCookies="true" requireSSL="false" />

This will limit the attackers to gain access to this sensitive information through Cross Site Scripting (XSS) attacks

Best anti viruses as of 2010

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Sanbox search is refined and instant

Google has modified their search alogrithm with instant speed and more accuracy.

The redundant data is null in the new search algorithm. Which is on production now. I'm using the new one. Which is really helpful for me to search many things instantly.

http://www2.sandbox.google.com/

The graphical part is as same..

One of the stunning errors you may get while trying to run the .net application:Quote:
Description: An error occurred during the processing of a configuration file required to service this request. Please review the specific error details below and modify your configuration file appropriately.

Parser Error Message: Access is denied: 'MyWebApp'.

Source Error:

Line 198:

As you can see the debug information is quite unclear and it would leave no trace of idea as to where the problem is.

The actual problem is because of the Microsoft Indexing Services which scans the Temporary ASP.NET Files and while doing so, the system puts a lock on the same.

To resolve this, the following steps need to be carried out:-

Start - Settings - Control Panel - Administrative Tools - Computer mangement.

Expand the services and applications node and select the Indexing service node.

Expand the Indexing Service Node and then select and expand the System Node.

Right click on Directories and select new directory. browse the path to the temporary asp.net files c:\winnt\microsoft.net\framework\v1.1.4322\.

Select the temporary asp.net files. give ok and then select the "NO" in the Include in index radiobutton.

give ok and then stop and start the indexing service.

Google History by Timeline --- Awesome

Google is still unbeaten. Every one who uses Google gets inspired by them.

Kindly check their Growth history by years

Click here

ASP.NET 3.5 JavaScript Intellisense hotfix

Microsoft has released a hot fix for JavaScript IntelliSense in Visual Studio.

The fix can be applied on VS.NET 2008 with SP1.

All we need to do is copy the JavaScript doc (in XML documentation format as used in standard C# documentation), with "-vsdoc.js" appended to the JScript file name, in the same source folder.

Also, we can use the intellisense in an external JavaScript file, by specifying the configuration line on top of our JavaScript file.
Code:
///
May be we can use the same to create our custom well documented JScript library..

Definitely a productivity improvement tool for ASP.NET developers..



References:

VS 2008 JavaScript Intellisense @ ScottGu's Blog

Visual Studio patched for better jQuery IntelliSense

IntelliSense flavor for Visual Studio 2008 JavaScript files @ Microsoft Help and Support

JQuery IntelliSense in Visual Studio 2008

The format for JavaScript doc comments

HttpCompression

Through HTTP compression a web application performance will increase tremendously
(depending on the browser support).
In PHP / ColdFusion this is built in and can be done using popular plug-in like Combine and Minify.
In ASP.NET this can be achieved by either configuring the IIS, or modifying the Global.asax file. There is an online tool available to check the compressionClick here online tool
Rate of compression is more means faster response, less bandwidth, and a more satisfied end-user!! But take care while using this in AJAX application. Better don’t go for it.

void Application_PreRequestHandlerExecute(object sender, EventArgs e)
{
HttpApplication app = sender as HttpApplication;
string acceptEncoding = app.Request.Headers["Accept-Encoding"];
Stream prevUncompressedStream = app.Response.Filter;
if (!(app.Context.CurrentHandler is Page app.Context.CurrentHandler.GetType().Name == "SyncSessionlessHandler")
app.Request["HTTP_X_MICROSOFTAJAX"] != null)
return;
if (acceptEncoding == null acceptEncoding.Length == 0)
return;
acceptEncoding = acceptEncoding.ToLower();
if (acceptEncoding.Contains("deflate") acceptEncoding == "*")
{
// defalte
app.Response.Filter = new DeflateStream(prevUncompressedStream,
CompressionMode.Compress);
app.Response.AppendHeader("Content-Encoding", "deflate");
} else if (acceptEncoding.Contains("gzip"))
{
// gzip
app.Response.Filter = new GZipStream(prevUncompressedStream,
CompressionMode.Compress);
app.Response.AppendHeader("Content-Encoding", "gzip");
}
}


We have two compression methods. They are Deflate and GZIP. They are using the name space System.IO.Compression