Request format is unrecognized for URL unexpectedly ending in

Today I want to share with you a new problem which I had faced yesterday.
Problem:
It was about web service related error. I have used Web Method() in my application to fill up a country dropdown. Everything was going well but when I had used this web method it showed me an error like this:

System.InvalidOperationException: Request format is unrecognized for URL unexpectedly ending in '/GetCountyList'.

Information:
After googling, I have found the solution.

This error was occured because GET and POST are disabled by default in ASP.NET 2.0 and greater.

Now I would like to share this with you. From msdn I have got some relative information which may help you to get understand clearly.

The .NET-connected Web services support HTTP GET, HTTP POST and SOAP protocols. By default, in .NET Framework 1.0, all three protocols are enabled. By default, in .NET Framework 1.1 or greater, HTTP GET and HTTP POST are both disabled. This is for security reasons.

Applications that use HTTP GET or HTTP POST to invoke a Web service fail when the Web service is upgraded to .NET Framework 1.1 or greater. These applications receive a exception: System.InvalidOperationException: Request format is unrecognized.

Solution:
HTTP GET and HTTP POST may be enabled by editing the Web.config file for the vroot where the Web service resides. The following configuration enables both HTTP GET and HTTP POST:

<configuration>
<system.web>
<webServices>
<protocols>
<add name="HttpGet"/>
<add name="HttpPost"/>
</protocols>
</webServices>
</system.web>
</configuration>

For more info pls visits these links:
http://support.microsoft.com/default.aspx?scid=kb;en-us;819267
http://forums.asp.net/t/1459560.aspx
http://aspadvice.com/blogs/ssmith/archive/2007/09/04/FIX-Request-format-is-unrecognized-for-URL-unexpectedly-ending-in.aspx
http://forums.asp.net/t/988377.aspx

How to show Page loading progress with modal background

Problem:
In my recent application development I have faced a strange problem to show modal background with page loading progress. I had tried in different way but not working perfectly. Then I have solved it. I think that there is another efficient way to solved it but now this time it is working for me.

Solution:

In css class:
.divModalBackground
{
filter: alpha(opacity=50); -moz-opacity:0.5; opacity: 0.5;
width:100%;
background-color: #999988;
position: absolute;
top: 0px;
left: 0px;
z-index: 800;
}

In aspx page:
<asp:Panel ID="Panel1" runat="server" Height="900px" Width="100%" CssClass="divModalBackground" Visible="true" >
<asp:Image runat="Server" ID="ImageLoader" CssClass="LoadingProgress" ImageUrl="../../App_Themes/Black/images/ajax-loader.gif" />
</asp:Panel>


In aspx.cs page I put the code like this:
//to show modal popup at page startup
protected override void OnInit(EventArgs e)
{
base.OnInit(e);
Panel1.Visible = true;
}

In aspx page place this
// to clear the modal background when page load complete, place this code at the end of your page just before the end of the form tag
<script type="text/javascript" >
function init()
{
var objdiv=document.getElementById('<%=Panel1.ClientID%>')
if(objdiv)
{
objdiv.style.visibility = 'hidden';
}
}

init();
</script>

Prevent Duplicate record insertion on page refresh in asp.net

Problem:
Today I have faced a new problem(new for me), when I press save button it works fine and then refresh(F5 or Refresh button on browser) the page but this time it is execute the button click event again. For this duplicate data posting on the server.

I try to find out the problem, nothing wrong in my code. Now turn to google and figure out the problem with solution. I have got several solutions. Now I would like to share this solution which solved my problem ......

Solution:

Assume that in Test.aspx page you have a button and a TextBox:

<asp:Button ID="btnSubmit" runat="server" Text="Submit" Width="110px" OnClick="btnSubmit_Click" />
<asp:TextBox ID="TxtName" runat="server"></asp:TextBox>

In Test.aspx.cs..:

public partial class Test : System.Web.UI.Page
{
protected override void OnInit(EventArgs e)
{
btnSubmit.Click += new EventHandler(btnSubmit_Click);base.OnInit(e);
}
protected void Page_Load(object sender, EventArgs e)
{

}
private void Save_Click(object sender, EventArgs e)
{
if (CheckIfDuplicateRequest())

{
return;

}
//Your code to insert the value of the SomeText textbox into the database.
//Set the value of one of the key fields in your web form in session
Session["Refresh"] = TxtName.Text;

}

private Boolean CheckIfDuplicateRequest()
{
if (Session["Refresh"] == null)
{
//Probably submitting the page for the first time
return false;
}
String previousValue = Session["Refresh"].ToString();
if (previousValue != TxtName.Text)
{
//Submitting the page with a different set of values
return false;
}
//Duplicate request.
return true;
}

}

you can get more help from these post:
http://aspalliance.com/687
http://forums.asp.net/p/1296011/3702515.aspx
http://forums.asp.net/p/1190997/2045619.aspx

How to speed up your web site/application

In my recent experience I have faced some performance issues one of them is web application becomes very much slow. To identify this problem I have searched over the net and I have found a lots of topics.

Now I want to share some of the topics with you in summarized way:

1.Minimize HTTP Requests
2.Use a Content Delivery Network
3.Add an Expires or a Cache-Control Header
4.Gzip Components
5.Put Stylesheets at the Top
6.Put Scripts at the Bottom
7.Avoid CSS Expressions
8.Make JavaScript and CSS External
9.Reduce DNS Lookups
10.Minify JavaScript and CSS
11.Avoid Redirects
12.Remove Duplicate Scripts
13.Configure ETags
14.Make Ajax Cacheable
15.Flush the Buffer Early
16.Use GET for AJAX Requests
17.Post-load Components
18.Preload Components
19.Reduce the Number of DOM Elements
20.Split Components Across Domains
21.Minimize the Number of iframes
22.No 404s
23.Reduce Cookie Size
24.Use Cookie-free Domains for Components
25.Minimize DOM Access
26.Develop Smart Event Handlers
27.Choose over @import
28.Avoid Filters
29.Optimize Images
30.Optimize CSS Sprites
31.Don't Scale Images in HTML
32.Make favicon.ico Small and Cacheable
33.Keep Components under 25K
34.Pack Components into a Multipart Document
35.Enable HTTP Keep-Alives
36.Adjust Connection Timeouts
37.Enable HTTP Compression

Dynamically add control in asp.net

Recently I have faced a problem when try to dynamically add controls in asp.net, like this,
In test.aspx page

<body>
    <form id="form1" runat="server">
    <div>
        <asp:PlaceHolder ID="PlaceHolder1" runat="server" >    </asp:PlaceHolder>

    </div>
    </form>
</body>

In test.aspx.cs
protected void Page_Load(object sender, EventArgs e)
{
Button btn = new Button();
btn.ID = "btnSave";
this.PlaceHolder1.Controls.Add(btn);
}

Problem:

It is working fine but when I press any button I mean any post back occur It disappears.
After search for a long time I got the proper solution, now I would like to share this with you.

Solution:
To avoid this problem one should dynamically load the controls during Page_Init because we may want to hook up our events with proper handler at an early stage.

protected void Page_Init(object sender, EventArgs e)
{
Button btn = new Button();
btn.ID = "btnSave";
btn.Click+=new EventHandler(btn_Click);
this.PlaceHolder1.Controls.Add(btn);
}

Some Tips:
In addition I have got more tips on it,

Control's Lify cycle:

1.Initialization
2.Load view state
3.Process postback data
4.Load
5.Send postback change notifications
6.Handle postback events
7.Prerender
8.Save state
9.Render
10.Dispose
11.Unload

You will get details from here:http://msdn.microsoft.com/en-us/library/aa719775%28VS.71%29.aspx

1.During Page_Init you cannot assign dynamic control property,because in Page_Init event Initialization happens before loadViewState in control's life cycle.The value assigned to the properties during Initialization will simply get overwritten by the ViewState values.

2.If you are expecting your ViewState to retain after the postback, always assign same ID to the dynamic control,if you use like this,

protected void Page_Init(object sender, EventArgs e)
{
TextBox t = new TextBox();
t.ID = Guid.NewGuid().ToString();
this.form1.Controls.Add(t);
}

It will not work. You should use same id or fixed id ,
like this, t.ID="txtName";


Original info:
http://geekswithblogs.net/shahed/archive/2008/06/26/123391.aspx

Use Master page <body> tag in Content page of asp.net

How to use the <body> onclick from content page in asp.net?

Master page is introducing from asp.net 2.0, this is the main layout page for whole application content page just inherit it.

So that,we get the <body> tag only in Master page,in content page there is no body tag. But I need to use this body tag from content page.

After search it I found a solution in asp.net forum. Original link: http://forums.asp.net/t/1062445.aspx

Sample:

<%@ Page Language="C#" MasterPageFile="~/MasterPage.master" AutoEventWireup="true" CodeFile="Default.aspx.cs" Inherits="Default" Title="Test Page" %>

<asp:Content ID="Content1" ContentPlaceHolderID="ContentPlaceHolder1" Runat="Server">
<script type="text/javascript">

function ClearBox()
{
var divBoxID=document.getElementById('BoxDiv');
divBoxID.style.display='none';
}

document.body.onclick= ClearBox;

</script>

    <input id="Button1" type="button" value="button" />
 
</asp:Content>

For more info pls visit:
http://msdn.microsoft.com/en-us/library/7a9d6h4f.aspx
http://forums.asp.net/t/1225951.aspx

Converting Single-File Web Forms Pages to Code-Behind Pages

Sometimes I face some problem with single web form(only aspx page no code behind page) page. I am used to work in code-behind page,so that I try to solve this problem in may way but at last I found the solution in msdn. So I want to share this portion of the article with you:

It might be that the only thing you want to do with a single-file Web Forms page in Visual Studio is to convert it to a code-behind Web Forms page. Using Visual Studio to convert a single-file page to a code-behind page automatically accomplishes the following:

1. Generates a code-behind class file for the page.
2. Adds the appropriate page directives to the page so it is linked with the code-behind file.

The conversion does not do the following:

a. Convert inline code to code in the class file.

To convert a single-file .aspx page to code-behind

1. Open an existing project, or create a new ASP.NET Web application.
2. On the Project menu, click Add Existing Item.
3. Browse to the .aspx page that you want to convert.
4. Click Open. Visual Studio will display the following message:

There is no class file in the project associated with the Web Form ''. Create a new class file now?
5. Click Yes. Visual Studio will create the code-behind file and link it to the .aspx page.
6. Click the Show All Files button in Solution Explorer, and expand the tree below your newly converted file to see the code-behind class file.
7. Open the new .aspx file.
8. In HTML view, inspect the file to make sure it contains an @ Page directive at the top that contains the CodeBehind attribute.
9. Inspect the file to make sure it contains an HTML

element within the HTML tags. If not, add <form> and </form> tags around your controls, and in the opening tag, set the runat = "server" attribute so it looks similar to the following:

<form id="Form1" method="post" runat="server">

10. If the file contains calls to COM components — for example, ADO code — add the AspCompat attribute to the Page directive in HTML view:

<%@ Page [...] AutoEventWireup="false" AspCompat="true" %>

If you do not have any calls to COM components, you do not need to add the AspCompat attribute.
11. Move your code out of the .aspx file and into the .aspx.vb or .aspx.cs file.
If you are working with a legacy file that contains ASP code, you must convert it to ASP.NET code before you can move it to the code-behind page. Converting to ASP.NET also will help you to take advantage of dynamic browser customization, state maintenance, and other features the ASP.NET server controls provide. For details, see Converting ASP to ASP.NET.
12. Save the form, compile the project, and view it in the browser.
13. Check for issues that appear in the Task List window, and resolve them.

For more info please visit:
http://msdn.microsoft.com/en-us/library/aa290385%28VS.71%29.aspx