Thin Vs. Thick Clients

Basically, a thin client is a web based application and most of the processing is done on the server side.

A thick client is installed into the client side. It is still connected to the server, but most of the processing is done on client side. With thick client, there won't be much processing via the network. In a way, it will be a much faster option if your network is slow or congested.

The codes are different for thick and thin clients. I think if you code in components, you can reuse the code about 60% - 80% of the time depending on the requirements.

More specific..

Thin Client: Is a Web Application, and runs on Internet Explorer. You access the application using http://hostname:portNumber/iSupport=20 Here you have a webserver and database in the background. It can be 2-tier or N-tier.

List of protocols used with thin clients

* Appliance Link Protocol
* Citrix ICA
* Remote Desktop Protocol
* Secure Shell or SSH, an encrypted replacement for telnet.
* Virtual Network Computing
* X11, central to Unix windowing
* XML, HTML, or JSON over HTTP (Ajax)
* DisplayLink over USB
* NFS

Thick Client: Is the Application which runs on Windows. It's like any other Windows based program/software. It can be accessed on the same system on which you have it installed.

Advantages of thick clients

1. Fewer server requirements. A thick client server does not require as high a level of performance as a thin client server (since the thick clients themselves do much of the application processing). This results in drastically cheaper servers.
2.Offline working. Thick clients have advantages in that a constant connection to the central server is often not required.
3.Better multimedia performance. Thick clients have advantages in multimedia-rich applications that would be bandwidth intensive if fully served. For example, thick clients are well suited for video gaming.
4.More flexibility. On some operating systems software products are designed for personal computers that have their own local resources. Running this software in a thin client environment can be difficult.
5.Using existing infrastructure. As many people now have very fast local PCs, they already have the infrastructure to run thick clients at no extra cost.
6.Higher server capacity. The more work that is carried out by the client, the less the server needs to do, increasing the number of users each server can support.

String Format for Double [C#]

This information help me a lot to solve my currency related calculation... so share with you. Hope that it may also helpful for other guys...

The following examples show how to format float numbers to string in C#. You can use static method String.Format or instance methods double.ToString() and float.ToString().

Digits after decimal point

This example formats double to string with fixed number of decimal places. For two decimal places use pattern „0.00“. If a float number has less decimal places, the rest digits on the right will be zeroes. If it has more decimal places, the number will be rounded.
[C#]

// just two decimal places
String.Format("{0:0.00}", 123.4567); // "123.46"
String.Format("{0:0.00}", 123.4); // "123.40"
String.Format("{0:0.00}", 123.0); // "123.00"

Next example formats double to string with floating number of decimal places. E.g. for maximal two decimal places use pattern „0.##“.
[C#]

// max. two decimal places
String.Format("{0:0.##}", 123.4567); // "123.46"
String.Format("{0:0.##}", 123.4); // "123.4"
String.Format("{0:0.##}", 123.0); // "123"

Digits before decimal point

If you want a float number to have any minimal number of digits before decimal point use N-times zero before decimal point. E.g. pattern „00.0“ formats a float number to string with at least two digits before decimal point and one digit after that.
[C#]

// at least two digits before decimal point
String.Format("{0:00.0}", 123.4567); // "123.5"
String.Format("{0:00.0}", 23.4567); // "23.5"
String.Format("{0:00.0}", 3.4567); // "03.5"
String.Format("{0:00.0}", -3.4567); // "-03.5"

Thousands separator

To format double to string with use of thousands separator use zero and comma separator before an usual float formatting pattern, e.g. pattern „0,0.0“ formats the number to use thousands separators and to have one decimal place.
[C#]

String.Format("{0:0,0.0}", 12345.67); // "12,345.7"
String.Format("{0:0,0}", 12345.67); // "12,346"

Zero

Float numbers between zero and one can be formatted in two ways, with or without leading zero before decimal point. To format number without a leading zero use # before point. For example „#.0“ formats number to have one decimal place and zero to N digits before decimal point (e.g. „.5“ or „123.5“).

Following code shows how can be formatted a zero (of double type).
[C#]

String.Format("{0:0.0}", 0.0); // "0.0"
String.Format("{0:0.#}", 0.0); // "0"
String.Format("{0:#.0}", 0.0); // ".0"
String.Format("{0:#.#}", 0.0); // ""

Align numbers with spaces

To align float number to the right use comma „,“ option before the colon. Type comma followed by a number of spaces, e.g. „0,10:0.0“ (this can be used only in String.Format method, not in double.ToString method). To align numbers to the left use negative number of spaces.
[C#]

String.Format("{0,10:0.0}", 123.4567); // " 123.5"
String.Format("{0,-10:0.0}", 123.4567); // "123.5 "
String.Format("{0,10:0.0}", -123.4567); // " -123.5"
String.Format("{0,-10:0.0}", -123.4567); // "-123.5 "

Custom formatting for negative numbers and zero

If you need to use custom format for negative float numbers or zero, use semicolon separator „;“ to split pattern to three sections. The first section formats positive numbers, the second section formats negative numbers and the third section formats zero. If you omit the last section, zero will be formatted using the first section.
[C#]

String.Format("{0:0.00;minus 0.00;zero}", 123.4567); // "123.46"
String.Format("{0:0.00;minus 0.00;zero}", -123.4567); // "minus 123.46"
String.Format("{0:0.00;minus 0.00;zero}", 0.0); // "zero"

Some funny examples

As you could notice in the previous example, you can put any text into formatting pattern, e.g. before an usual pattern „my text 0.0“. You can even put any text between the zeroes, e.g. „0aaa.bbb0“.
[C#]

String.Format("{0:my number is 0.0}", 12.3); // "my number is 12.3"
String.Format("{0:0aaa.bbb0}", 12.3); // "12aaa.bbb3"

You will get more help from here

Handling JSON Arrays returned from ASP.NET Web Services with jQuery

The Web Service methods that I will use revolve around cars. Having set up a web site in Visual Studio 2008, I have added a new item of type "Web Service" to the project, calling it EmpInfoService.asmx. The code-behind - EmpInfoService.cs - is automatically generated within the App_Code folder. The full code for that class file is as follows:

Code: asmx

public class Employee
{
public string FullName;
public string Designation;
public string PhoneNo;
}


/// <summary>
/// Summary description for Emp info
/// </summary>


[WebService(Namespace = "http://tempuri.org/")]
[WebServiceBinding(ConformsTo = WsiProfiles.BasicProfile1_1)]


[ScriptService]
public class EmpInfoService : WebService
{
List Employees = new List{
new Employee{FullName="Shakil",Designation="Manager",PhoneNo=5555454},
new Employee{FullName="Ahsan",Designation="Director",PhoneNo=4545454},
new Employee{FullName="Murhsed",Designation="Director",PhoneNo=5454545},
new Employee{FullName="Khurshid",Designation="Officer",PhoneNo=4545545},
new Employee{FullName="Abdul",Designation="Sr.Executive",PhoneNo=45454545},
new Employee{FullName="Yususf",Designation="Sr.Officer",PhoneNo=4545454545},
new Employee{FullName="Farid",Designation="Executive",PhoneNo=45454545},
new Employee{FullName="Munir",Designation="Executive",PhoneNo=454545454},
new Employee{FullName="Foyez",Designation="Executive",PhoneNo=45454545454}
};



[WebMethod]
public List GetAllEmployees()
{
return Employees;
}

[WebMethod]
public List GetEmployeesByName(string name)
{
var query = from c in Employees
where c.FullName == name
select c;
return query.ToList();
}
}


Code: ASPX

The mark-up in the aspx page that will call the Web Service is extremely simple:

<form id="form1" runat="server">
<input type="button" id="btnEmpId" value="Get Employe List" />
<div id="output"></div>
</form>



All that's needed now is some Javascript for the getEmployees() method that has been assigned to the onclick event of the html button. This will go into the <head> section of the page:

First, jQuery is referenced via the src attribute of the first <script> tag. Then a click event is registered with the button which will invoke the getEmployees() function. After that is the getEmployees() function that is fired when the button is clicked.



Jquery:(Without parameter)

<script type="text/javascript" src="script/jquery-1.3.2.min.js"></script>
<script type="text/javascript">

$(function() {
$('#Button1').click(getEmployees);
});


function getEmployees() {
$.ajax({
type: "POST",
url: "EmployeeService.asmx/GetAllEmployees",
data: "{}",
contentType: "application/json; charset=utf-8",
dataType: "json",
success: function(response) {
var Employees = response.d;
$('#output').empty();
$.each(Employees, function(index, Employee) {
$('#output').append('<p><strong>' + Employee.FullName + ' <br />' +
Employee.Designation + '</strong><br /> Designation: ' +
Employee.PhoneNo + '<br />Phone: ' +'</p>');
});
},

failure: function(msg) {
$('#output').text(msg);
}
});
}
</script>


It makes use of the $.ajax(options) function within jQuery, and accepts an object with a number of optional properties.
type specifies the HTTP method, which in this case is POST.
url specifies the URL of the Web Service, together with the web method that is being called. This is followed by the parameters, which are applied to the data property.

In this case, no parameters are being passed, as we are calling the method that retrieves the entire collection of Employee.
The contentType and dataType MUST be specified.
Following this are two further functions: success defines what should be done if the call is successful, and failure handles exceptions that are returned.

In this case, the success callback is passed the resulting HTTP response. In response an object with a property - d - is returned, which contains an array of objects. Each object has a __type property which tells you that it is a Employee object, followed by the other properties of our Web Service Employee object.

The div with the id of output is emptied, in case there was clutter there from a previous ajax call. The jQuery each() function is used to iterate over the collection of objects. Each Employee object is accessed in turn, and its properties are written to a paragraph, which is then appended to the content of div output.

Now, share with you how to send parameter using jquery,
Here we want to filter employee info with employee name from DropDownList

<asp:DropDownList ID="ddlEmpName" runat="server">
<asp:ListItem>Shakil</asp:ListItem>
<asp:ListItem>Ahsan</asp:ListItem>
<asp:ListItem>Murshed</asp:ListItem>
<asp:ListItem>Farid</asp:ListItem>
</asp:DropDownList>

Jquery(with parameter see the bold):

<script type="text/javascript" src="script/jquery-1.3.2.min.js"></script>
<script type="text/javascript">

$(function() {
$('#Button1').click(getEmployees);
});


function getEmployees() {
$.ajax({
type: "POST",
url: "EmployeeService.asmx/GetEmployeesByName",
data: "{name: " + $('#<%= ddlEmpName.ClientID %>').val() + " }",
contentType: "application/json; charset=utf-8",
dataType: "json",
success: function(response) {
var Employees = response.d;
$('#output').empty();
$.each(Employees, function(index, Employee) {
$('#output').append('<p><strong>' + Employee.FullName + ' <br />' +
Employee.Designation + '</strong><br /> Designation: ' +
Employee.PhoneNo + '<br />Phone: ' +'</p>');
});
},

failure: function(msg) {
$('#output').text(msg);
}
});
}
</script>

The url option now points to the appropriate method, and a parameter is passed into the data option, which uses jQuery syntax to reference the selected value from the DropDownList. I have used inline ASP.NET tags in this case to dynamically render the ID of the DropDownList using the ClientID property, so that there will be no issues in referencing the DropDownList if this code was transferred to a User Control or another control that implements INamingContainer.

All credits goes to Mr.Mikesdotnetting because I solved my problem from this superb article.

JScript Editor Extensions for the Visual Studio 2010 JScript editor

This really a nice extensions which is make life easy for developer specially for JavaScript development.

Bundles the following extensions for the Visual Studio 2010 JScript editor:

Brace Matching

Adds support for automatically highlighting the matching opening or closing brace to the one currently at the cursor. Supports matching parenthesis: (), square brackets: [], and curly braces: {}. Braces in strings, comments and regular expression literals are ignored.

Outlining / Cold-folding

Adds support for automatically creating outlining regions for JScript blocks. Blocks are detected via opening and closing curly braces. Braces in strings, comments and regular expression literals are ignored.

Current Word Highlighting

Adds support for highlighting all instances of the word currently at the cursor.
IntelliSense Doc-Comments Support

Adds support for the element in JScript IntelliSense doc-comments to allow display of new lines in IntelliSense tooltips, e.g.

function hello(name) {
///

A great function
/// Some info on a new line
///

/// The name to say hello to return "hello " + name;
}

Updated vsdoc files for jQuery with tags are available for jQuery 1.4.3, 1.4.4 and 1.5

Source Code

The source code for these extensions is available on the ASP.NET CodePlex site in the folder: $/VisualStudioWebTooling/JScriptExtensions

For more information:
http://visualstudiogallery.msdn.microsoft.com/872d27ee-38c7-4a97-98dc-0d8a431cc2ed/

Check/Uncheck all items in a CheckBoxList using Javascript

In my previous article show how to check/uncheck all items in a CheckBoxList using ASP.NET. Today we do the same using javascript.

Note: If you use the master page in your application remember that you need to use 'Control.ClientID'. Because When the page is rendered in the browser, the content and master pages get merged into a single page. This means that the IDs for the controls get renamed. ASP.NET renames the IDs to prevent naming conflicts. Now to handle the renamed controls, ASP.NET provides the ‘Control.ClientID’ and ‘Control.UniqueID’ to get the renamed ID’s.


Use the following code at the Page load event to add items to the CheckBoxList programmatically:

protected void Page_Load(object sender, EventArgs e)
{
if (!Page.IsPostBack)
{
cblTest.Items.Add(new ListItem("Dhaka", "Dhaka"));
cblTest.Items.Add(new ListItem("Chittagong", "Chittagong"));
cblTest.Items.Add(new ListItem("Shylet", "Shylet"));
cblTest.Items.Add(new ListItem("Rajshahi", "Rajshahi"));
}
}

The prototype of our javascript function will be the following :
function CheckBoxListSelect(<pass the control>, <state i.e true or false>)
{
// Our code will come here
}

Now drag and drop two asp:button which are named as "CheckedAll" and "UnCheckedAll" respectively.

In this event, we will call the javascript function and pass the respective checkboxlist controls and the state which will describe ‘true’ for CheckedAll button or ‘false’ for UnCheckedAll button.

Check All:
For Check all write the following code in the onClientClick event of "CheckedAll" button
<asp:Button ID="btnCheckAll" runat="server" Text="CheckedAll" OnClientClick="javascript: CheckBoxListSelect ('<%= cblTest.ClientID %>',true)"


Uncheck All:
For UnCheck all write the following code in the Click Event of "UnCheckedAll" button
<asp:Button ID="btnUnCheckAll" Text="UnCheckedAll" runat="server" OnClientClick="javascript: CheckBoxListSelect ('<%= cblTest.ClientID %>',false)"


JavaScript function:

<asp:Content ID="Content1" ContentPlaceHolderID="ContentPlaceHolder1" Runat="Server">
<script language="javascript" type="text/javascript">
function CheckBoxListSelect(cbControl, state)
{
var chkBoxList = document.getElementById(cbControl);
var chkBoxCount= chkBoxList.getElementsByTagName("input");
for(var i=0;i<chkBoxCount.length;i++)
{
chkBoxCount[i].checked = state;
}

return false;
}
</script>
// ASP.NET Controls are placed here
</asp:Content>


In this javascript function, we accept two parameters, the checkboxlist control and the state (i.e true or false) of each checkbox, that we would like it to be.Since asp.net renders each checkbox as an input tag, what we are really doing over here is first getting the checkboxlist control using document.getElementById(cbControl) and then counting the number of <input> tags inside that control. Once we get the count, we use a loop to set the state of each control.

Check/Uncheck all items in a CheckBoxList using ASP.NET

The CheckBoxList control in ASP.NET 2.0 is one of the useful control for asp.net developer. But it is not so easy(also not complicated :))to handling like checkbox. This control provides a group of checkboxes that can be dynamically generated by binding it to a data source.

You can handling its operation programmatically using both asp.net or JavaScript. Today I discuss how to checked and unchecked items in CheckBoxList using ASP.net/C#.

First you can bind data to CheckBoxList control using a smart tag appears which allows you to specify a datasource or add items manually to the CheckBoxList.Click on the ‘Edit Items’ to open the ListItem Collection Editor and add items.

Bind data into this control from data source like this:

// Assuming that GetCityList() returns a list of CityID and CityName items in a sqldatareader

SqlDataReader dr = GetCityList ();
cblTest.DataSource = dr;
cblTest.DataValueField = "CityID ";
cblTest.DataTextField = "CityName ";
cblTest.DataBind();


Or, use the following code at the Page load event to add items to the CheckBoxList programmatically:

protected void Page_Load(object sender, EventArgs e)
{
if (!Page.IsPostBack)
{
cblTest.Items.Add(new ListItem("Dhaka", "Dhaka"));
cblTest.Items.Add(new ListItem("Chittagong", "Chittagong"));
cblTest.Items.Add(new ListItem("Shylet", "Shylet"));
cblTest.Items.Add(new ListItem("Rajshahi", "Rajshahi"));
}
}

Now drag and drop two asp:button which are named as "CheckedAll" and "UnCheckedAll" respectively.

Check All:
For Check all write the following code in the Click Event of "CheckedAll" button

protected void CheckedAll_Click(object sender, EventArgs e)
{
foreach (ListItem li in cblTest.Items)
{
li.Selected = true;
}
}


Uncheck All:
For UnCheck all write the following code in the Click Event of "UnCheckedAll" button

protected void UnCheckedAll_Click(object sender, EventArgs e)
{
foreach (ListItem li in cblTest.Items)
{
li.Selected = false;
}
}

"System.Security.SecurityException: Security error" error message when the virtual directory points to a remote share in ASP.NET

Very recently, We have faced a problem to deploy application. The problem is raised when virtual directory points to a remote PC. The scenario is describe below..
PC1-- Web server(where IIS and .net framework is installed)
PC2-- Remote pc where precompile application directory located.

When deploy application virtual directory is created in PC1 but precompile application folder is points to remote PC2. After configure everything it shows me exception about security permission. After searching I added <trust level="Full"/ > in web.config file. Unfortunately, it shows me the same error

Parser Error Description:

An error occurred during the parsing of a resource required to service this request. Please review the following specific parse error details and modify your source file appropriately.

After search in various site I found the solution in msdn.

Why this problem occur?

The System.Web namespace does not have the AllowPartiallyTrusted CallersAttribute applied to it.
http://msdn2.microsoft.com/en-us/library/ms994923.aspx

Any code that is not in the My_Computer_Zone code group that does not have this attribute requires the FullTrust user right. Therefore, the remote share that holds the Web applications content requires FullTrust.

Solution 1:Using Administrative Tools

To resolve this behavior, grant the FullTrust right to the remote share:

1. On the Web server, open Administrative Tools, and then double-click Microsoft .NET Framework Configuration.
2. Expand Runtime Security Policy, expand Machine, and then expand Code Groups.
3. Right-click All_Code, and then click New.
4. Select Create a new code group. Give your code group a relevant name, such as the name of the applications share. Click Next.
5. In the Choose the condition type for this code group list, select URL.
6. In the URL box, type the path of the share in the following format:
file:////\\computername\sharename\*
Note:Replace computername with the name of the computer that is hosting the remote share. Replace sharename with the name of the share.
7. Click Next. On the next page, select Use an existing permission set, and then select FullTrust.
8. Click Next, and then click Finish.
9. Restart Microsoft Internet Information Services (IIS) to restart the ASP.NET worker process.

If Microsoft .NET Framework Configuration is not displayed under Administrative Tools, you can install the .NET Framework SDK to add Microsoft .NET Framework Configuration.

Solution 2:Using Command line
Alternatively, you can run the following command to make the change:

Drive:\WINDOWS\Microsoft.NET\Framework\v2.0.50727\caspol.exe -m -ag 1 -url "file:////\\computername\sharename\*" FullTrust -exclusive on

Note For more information about what these arguments do, run the following command:
caspol.exe -?

Additional Information:

In this configuration, the account under which the ASP.NET worker process runs must have sufficient rights to the remote share. You can set the account under which the worker process runs by using the Processmodel tag in the Machine.config file.
Back to the top
Steps to reproduce the behavior

1. Create a new virtual directory that points to a remote share.
2. Create an application for the virtual directory. Make sure that the user who connects to the share has read access to the remote content.
3. In the Processmodel tag of the Machine.config file, change the user to a domain user who has list, read, and execute permissions on the remote share.
4. Create an inline .aspx file, and then put the file in the remote share.
5. Make a request for the page.

For more information:
Please visits
http://support.microsoft.com/kb/317012
http://support.microsoft.com/kb/306590