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The Differences of ASP.NET Forms and Windows Forms in a Nutshell

Posted by triaslama on June 24, 2008

I think its quite interesting if we compare two things that has equalities and differences. Now we will talk about Forms (WebForms and WinForms).

As we already know WebForms uses browser as presentation (ASP.NET Forms is no exception) and Windows Forms has its own presentation. So we may agree that WebForms has the strength through its availability and WinForms through its rich user interface.

In this post I will talk about the differences, what I get from both forms (ASP.NET Forms and Windows Forms) at a glance. I hope this post not tedious for those who already familiar with ASP.NET and Windows Forms.

Base Class
An ASP.NET Form inherits Page class (contained in System.Web.UI namespace). Look at the following example:
Presentation page (Welcome.aspx):

    <%@ Page Language=”C#” debug=”true” CodeFile=”Welcome.aspx.cs” Inherits=”Welcome.HelloWorldClass” %>

    <html>
    <head>
    <title>Welcome To ASP.NET Form</title>
    <script lang=”C#” runat=”server”>
    </script>
    </head>
    <body>
    <form runat=”server”>
    <center><asp:Label id=”label” Font-Size=”25px” style=”font-weight:bold;” runat=”server” /></center>
    </form>
    </body>
    </html>

 

This is the code behind (Welcome.aspx.cs):

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Posted in .NET, ASP.NET, C#, Programming | Tagged: , , , , | No Comments »

C# 3.0: Inferred Type Variables, Extension Methods, and Lambda Expressions

Posted by triaslama on May 27, 2008

C# 3.0 brings many of new features. Some of features developed from the existing one (such as lambda expressions that provides more concise syntax than anonymous methods). Other features can be considered as totally new (such as LINQ). In this post together we will learn about Inferred type variables, extension methods, and lambda expressions.

By reading this article I assume that you are familiar with C#, knowing the previous features of this language is a plus.

Inferred Type Variable
Inferred type variable presented through ‘var’ keyword. If you are a Javascript programmer you must be already familiar with ‘var’ keyword. But, ‘var’ in C# 3.0 has different meaning with ‘var’ keyword in Javascript. In C# 3.0 when we use ‘var’, we tell the compiler that the type of variable should be inferred from the assignment. In Javascript var means that a variable can hold any kind of type.
Consider the following Javascript file:

    var myVariable = 5;
    window.alert(myVariable);
    myVariable = “I change the type of myVariable, now myVariable is a string!”;
    window.alert(myVariable);

 

At the beginning I assign myVariable with 5 (an integer), but later, I assign myVariable with a string (so myVariable can hold any kind of value). But its not the case with ‘var’ in C# 3.0.

using System;

class InferredTypeVar
{
   static void Main()
   {
      var myVariable = 12.5;
      Console.WriteLine("myVariable: "+myVariable);
   }
}

 

Because I assign 12.5 to myVariable then type of myVariable will be double. If we try to fake the compiler and add the following code (hoping that it will the same as in Javascript):

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Posted in C# | Tagged: , , , | 4 Comments »

Pagination in ASP.NET

Posted by triaslama on May 18, 2008

ASP.NET has DataGrid control, and datagrid control has build in support for pagination. What I do in this post is just something like datagrid pagination, but I add two buttons each of them to navigate to previous and next page respectively.

I use ListOfPage class to produce list of page number, you can see more on this class in my previous post here. For simplicity I use array of string as data source, in more common scenario maybe we use data from database, represent it in DataTable then use the DataTable as a data source.

I do the manual pagination in ASP.NET with code behind style. There is I put the code that produce list of page in a separate file (I named it ManualPagination.aspx.cs). The presentation page laid in ManualPagination.aspx which refers to our code behind file.

Let’s start with presentation page! It’s quite simple, this is the source code (ManualPagination.aspx):

    <%@ Page Language=”C#” CodeFile=”ManualPagination.aspx.cs” Inherits=”ManualPagination.CodeBehindClass” %><html>
    <head>
    <title>Manual Pagination in ASP.NET</title>
    <style type=”text/css”>
    .clr
    {
    background-color:lightblue;
    }
    </style>
    </head>
    <body>
    <form runat=”server”>
    <asp:Label id=”lblPresentation” runat=”server” />
    <p />
    <asp:Button id=”btnPrev” text=”Prev” onclick=”btnPrev_Click” runat=”server” />

    <asp:Label id=”lblPages” runat=”server” />

    <asp:Button id=”btnNext” text=”Next” onclick=”btnNext_Click” runat=”server” />
    </form>
    </body>
    </html>

 

One of the important portion of our presentation page relies on the following code:

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Posted in ASP.NET, C#, Javascript | Tagged: , , , , , , | No Comments »

Page Number Generator

Posted by triaslama on May 13, 2008

One of the way to prevent show all of data in one page is pagination. Pagination is the process organizing information in pages. For instance, the information appear in a web pages is paginated such that appear 10 lines for every page.
Pagination can be a cool way to manage the looks and feels of information. Because too many tabular data often tedious, hard, or we maybe easily miss something if all of information dropped in a page.

So, what is needed to do pagination? I think one of the most apparent is a list of page! I have write a program (a simple program) in C# that generates page number. The input parameters is current page, number of rows in a page, and the amount of rows.

Output of this progam is array of integer, every number reflected page number being showed. And this is the listing of program:

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Posted in C#, Programming | Tagged: , , , | 3 Comments »

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