DOT NET – How to make a button as default button and set Focus on a particular text box

In the initial days when i was new to development side and in some site i used to login straight away when i enter username and password and hit Enter key on my keyboard.

I used to think how is this happening but never had any answer but now i am going to show how thats possible.

In this post I will be talking about how  to make any button Default button and set Focus on a particular text box in any page thats displayed.

Ex: Make a test site and go to default.aspx

Step 1:

in <body> tag write the following code

<body>

<form id=”frmExample” runat=”server” defaultbutton=”btnLogin” defaultfocus=”txtUserName”>

<table><tr><td width=”50%”>

Welcome to the Example Web site from dilip

</td>

<td width=”50%”>

<table>

<tr><td><asp:TextBox ID=”txtUserName” runat=”server” Text=”UserName” /></td><td><asp:TextBox ID=”txtPassword” runat=”server” Text=”Password”/></td></tr>

<tr><td><asp:Button ID=”btnLogin” runat=”server” Text=”Login” onclick=”btnLogin_Click”/></td><td><asp:Button ID=”btnSignIn” runat=”server” Text=”Signup”/></td></tr>

</table>

</td>

</tr>

</table>

</form>

</body>

Note: Here the beauty is that i have login and singnup button and i made defaultbutton as login button, and defaultfocus on username text box so whenever this page is viewed from any web browser focus will be on username text box and default button will be login button so when u hit enter it will invoke login button so simple.

 Step 2: see  carefully i have a function onclick=”btnLogin_Click” now press F7 key and go to .cs side of the same page or right click on the mouse and select view code .

and write the following code in .cs side

protected void btnLogin_Click(object sender, EventArgs e)

{

Response.Write(“Default Button was clicked and u are now logged In”);

Response.End();

}

Note: Here another concept when ever you enter key this method will be invoked and at the same time there wont be any other you can see that means response is closed just to make you feel that you really logged in but actually u are in same page.

the output is some this like this :

First Time when visited:

you can see username text box is in focus.

Then when enter key is pressed:

Reference : Dilip Kumar Jena ( https://mstechexplore.wordpress.com )

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DOT NET – What is a cookie

Recently I got a message from one of the reader of my site that what exactly is a cookie. So I decided to wire a post dedicated to it .

  1. A cookie is name=value pair like variable which is stored as a file(persistant cookie) and which travels automatically between every request and response.
  2. Cookies are based on domains(website). As long as user is working with current web site cookie will be available.
  3. Cookies are maintained by browser but not by server which means cookies based websites are dependent on client.
  4. Cookies can be created as
    (i) In-memory cookie
    (ii) Persistant Cookie

An In-memory cookie means as long as user is working with app it will be available – also called as Session Cookie.

Persistant cookie means it will be stored in client physical location and available online as well as offline.

Reference : Dilip Kumar Jena ( https://mstechexplore.wordpress.com )

DOT NET 4.0 – Concerns and criticisms relating to .NET

Here are most known Criticisms

  • Applications running in a managed environment such as the Microsoft framework’s CLR or Java’s JVM tend to require more system resources than similar applications that access machine resources more directly. Some applications, however, have been shown to perform better in .NET than in their native version. This could be due to the runtime optimizations made possible by such an environment, the use of relatively well-performing functions in the .NET framework, just-in-time compilation of managed code, or other aspects of the CLR.

 

  • As JIT languages can be more easily reverse-engineered than native code to algorithms used by an application there is concern over possible loss of trade secrets and the bypassing of license control mechanisms. Many obfuscation techniques already developed, however, can help to prevent this; indeed Microsoft’s Visual Studio 2005 includes such a tool.

 

  • In a managed environment such as the Microsoft framework’s CLR or Java’s JVM the regularly occurring garbage collection for reclaiming memory suspends execution of the application for an unpredictable lapse of time (typically no more than a few milliseconds).

 

  • Since the framework is not pre-installed on older versions of Windows an application that requires it must verify that it is present, and if it is not, guide the user to install it.

 

  • Newer versions of the framework (3.5 and up) are not pre-installed on any versions of the Windows operating system. Some developers have expressed concerns about the large size (around 54 MB for end-users with .NET 3.0 and 65 MB with .NET 3.5).

Reference : Dilip Kumar Jena ( https://mstechexplore.wordpress.com )

 

DOT NET 3.0 – Features of C# 3.0

C# 3.0 is the current version, and was released on 19 November 2007 as part of .NET Framework 3.5. It includes new features inspired by functional programming languages such as Haskell and ML, and is driven largely by the introduction of the Language Integrated Query (LINQ) pattern to the Common Language Runtime.[9]

C# 3.0 was unveiled at the 2005 Professional Developers Conference. It is not currently standardized by any standards organisation, though it is expected that it will eventually become an ECMA and then ISO standard, as did its predecessors.

Reference : Dilip Kumar Jena ( https://mstechexplore.wordpress.com )

DOT NET 2.0 – Features of C# 2.0

New features in C# for the .NET SDK 2.0 (corresponding to the 3rd edition of the ECMA-334 standard) are:

  • Partial classes allow class implementation across more than one source file. This permits splitting up very large classes.
  • Generics or parameterized types.
  • Static classes that cannot be instantiated, and that only allow static members. This is similar to the concept of module in many procedural languages.
  • Anonymous delegates.
  • The accessibility of property accessors can be set independently.
  • Nullable value types which provides improved interaction with SQL databases.
  • Coalesce operator: (??) returns the first of its operands which is not null (or null, if no such operand exists):

Reference : Dilip Kumar Jena ( https://mstechexplore.wordpress.com )

DOT NET 4.0 – Versions and Features

Versions

1.0, 1.5, 2.0 (ECMA), 3.0

Features

C# differs from C and C++ in many ways, including:

  • There are no global variables or functions. All methods and members must be declared within classes. It is possible, however, to use static methods/variables within public classes instead of global variables/functions.
  • Multiple inheritance is not supported, although a class can implement any number of interfaces. This was a design decision by the language’s lead architect to avoid complication.
  • Full type reflection and discovery is available.

Reference : Dilip Kumar Jena ( https://mstechexplore.wordpress.com )