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Tuesday, January 28, 2014

The transfer fails if a user tries to upload a file in ASP.NET

Size restriction protects your web application from malicious users. They will upload numerous large files to your Web server. So Developers take the default size limitation is 4MB. The transfer fails if a user tries to upload a file that is larger then 4096kb. Now, if you want to change the default size limitation, you make some changes in either the root we.config file , which is found in that path (c:\Windows\Microsoft.NET\Framework\v4.0.xx\config) or in your application's web.config file.

How to Increase uploaded file size 

<httpRuntime> section takes different properties but two properties , The maxRequestLength and executionTimeout properties are very nice. If you want to change the default uploaded file size then you must to change the value of maxrequestLength. It take the size in KiloBytes. Lets take a simple syntax here.

maxRequestLength= 11000

The user can upload around 10mb files using file upload control. Also must to change the executionTimeout property, This property sets the time ( in seconds ) for a request to attempt to execute to the server before ASP.NET shuts down the request. try this into your web.config file

<system.web>
    <httpRuntime executionTimeout ="300" maxRequestLength ="11000"/>
</system.web>

Add Text with day in Calendar, ASP.NET Example

If you want to change the style of the Calendar control, you can do this during its rendering process. DayRender event provides such types of functionality, You can change specific day at run time. Lets take an simple example to add text with day. There are some following steps

Step-1 : Add Calendar control onto the web form
Step-2 : Change Calendar style using show smart tag. In this example, we are selecting Professional1 Style from Auto Format popup.
Step-3 : Handle DayRender Event
Step-4 : Copy this code and replace with your code
 <%@ Page Language="C#" AutoEventWireup="true" CodeFile="calendar.aspx.cs" Inherits="calendar" %>

 <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">

 <html xmlns="http://www.w3.org/1999/xhtml">
<head runat="server">
    <title></title>
</head>
<body>
    <form id="form1" runat="server">
    <div>
        <asp:Calendar ID="Calendar1" runat="server" BackColor="White" 
            BorderColor="White" BorderWidth="1px" Font-Names="Verdana" Font-Size="9pt" 
            ForeColor="Black" Height="295px" NextPrevFormat="FullMonth" 
            ondayrender="Calendar1_DayRender" Width="456px">
            <DayHeaderStyle Font-Bold="True" Font-Size="8pt" />
            <NextPrevStyle Font-Bold="True" Font-Size="8pt" ForeColor="#333333" 
                VerticalAlign="Bottom" />
            <OtherMonthDayStyle ForeColor="#999999" />
            <SelectedDayStyle BackColor="#333399" ForeColor="White" />
            <TitleStyle BackColor="White" BorderColor="Black" BorderWidth="4px" 
                Font-Bold="True" Font-Size="12pt" ForeColor="#333399" />
            <TodayDayStyle BackColor="#CCCCCC" />
        </asp:Calendar>
    </div>
    </form>
</body>
</html>

 Code Behind Code

 using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;

 public partial class calendar : System.Web.UI.Page
{
    protected void Page_Load(object sender, EventArgs e)
    {

     }
    protected void Calendar1_DayRender(object sender, DayRenderEventArgs e)
    {
        if (e.Day .DayNumberText =="10")
        {
            e.Cell.Controls.Add(new LiteralControl("<p>Holiday</p>"));
            e.Cell.BorderColor = System.Drawing.Color.Green;
            e.Cell.BorderWidth = 2;
            e.Cell.BorderStyle = BorderStyle.Solid;
        }
    }
}

Code Generate the following output

Add Text with day in Calendar, ASP.NET Example

Introduction of Structure in DataStructure, C Programming

       The standard data types available in any programming language like “C” cannot meet every need of the user his for data handling. It is not possible to implement s all real life activities and entities by using only standard data types. So the help of available standard data type by clubbing them into a single unit. Structures are user defined data types, which are used to club dissimilar data member into a single unit. That unit is the new user defined data type and can be used to declare the data variables according to the requirement.
             Usually the structures are defined to club the similar, related characteristics of an object derived as new data type.

Defining a structure  

             A structure is defined using a keyword struct and giving a name to the structure data type and declaring each individual members (elements) as normal declaration in a block (i.e., within a pair of curly brackets, {}) and ending the block by semicolon; because of data definition. The syntax of structure definition is as follows:
        struct datatype_name
        {
        Member1 declaration;
        …
       Membern declaration;
        };
Here “struct” is a key word. Datatype_name can be any valid identifier, used as a name for new data type. For example, an employee structure may be defined as:
        Struct emp
           {
             Int eno;
             Char ename [21];
             Float salary;
           };
Here “struct emp” is a new user defined data type (note: not a variable) and can be used to declare the variables of that type, like struct emp e1, e2, earr[10] etc. The variables defied inside the struct like eno, ename  and salary are the members of struct emp and are also called as elements of the structure. With the help of a variable of the type struct emp, the individual members (elements) may be referred by means of dot (.) operator also called as member access operator. At the time of defining data type the variables may be declared after closing curly bracket ‘}’, before the semi colon ‘;’ as shown below:
struct emp
{
 Int eno;
 char ename [21];
 float salary;
} e1,e2;
The structure variables can be initialized at the time of declaration as follows:
struct emp
{
  Int eno;
  Char ename [21];
  Float salary;
} e1={101,”Sachin”, 12360.55};


Monday, January 27, 2014

Change the Start Page in MVC application

When programmer runs the MVC application, it shows the default page having the address http://localhost:port/. Here localhost is the computer which is running that application at that time, means the client machine and the port is the number assigned for that application.

Run the application of simply press F5 and look out the default page as shown below:

Change the Start Page in MVC application

Now look out the default code written in the Route.Config file under the App_Start folder, which have some other files also. This code have information about the routes user write in the address bar of the browser.

routes.MapRoute(
name: "Default",
url: "{controller}/{action}/{id}",
defaults: new { controller = "Home", action = "Index", id = UrlParameter.Optional }

This MapRoute method have three parameters listed above i.e. the name of route, format of url (route may have) and the last one will be the default page to be redirected if any route is not found. The last parameter itself have three values, controller decides the name of controller from which the action is to be called. Action decides about the action to be called from the controller.

And the last one is id, which decide about the id of the record if given in the route. It is an optional parameter for the route. Now change the action from Index to About and run the application, It seems the change the default page shown below:

Change the Start Page in MVC application

Primitive Data Types used in Java Programming

Data can be of many types e.g. character, integer, real, string etc. Anything enclosed in single quotes represents character data. Numbers without fraction represent integer data. Numbers with fractions represent real data and anything enclosed in double quotes represents a string.

Since the data to be dealt with are of many types, a programming language must provide ways and facilities to handle all types of data. Java, like other languages provide ways and facilities to handle different types of data by providing data types.

Java data types are two types:

Primitive

Primitive data types we mean fundamental data types offered by Java programming language. Primitive are the basic data type values. The world ‘Primitive’ means a fundamentals component that may be used to create other large parts. Java supports following four categories of primitive data types:

Numeric Integral Types

The data types that are used to store numeric values fall under this sub category i.e. numeric primitive data types. Four numeric integral types in Java are Byte, Short, Int and Long. All integral numeric types store integer values i.e. whole numbers only.

The storage size and the range of values supported by numeric integral types are being listed below:
  • Byte (Size - 8 bits), Byte-length integer having range -128 to + 128.
  • Short (Size - 16 bits), Short integer having range -32,768 to + 32,767.
  • Int (Size – 32 bits), Integer having range (about) -2 billion to +2 billion.
  • Long (Size – 64 bits), Long Integer having range (about) -10E18 to +10E18.
Please note that an l (small L) or L suffix on an integer means the integer is of long data type e.g., 33L refer to a long integer value 33. Thus, we can say that 33 is an int value but 33L is a long value.

Depending upon your requirement, you can select appropriate data type. Consider this you need to store your phone no 12345678 in your program? What do you think should be the data type? Can you store in a byte or short data type? Well you need to store it in int data type. The reason behind is that the number to be stored does not fall into ranges supported by byte and short types.

One more thing that you must know about data types that all data types are singed i.e., they can store negative as well as positive numbers.

Run JavaScript code in Page_Load method, ASP.NET RegisterClientScriptBlock

The RegisterClientScriptBlock method allows you to run JavaScript function at the top of the browser page. It means Script run on Page_Load method. Lets take an simple example of that in ASP.NET.
<%@ Page Language="C#" %>

 <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">

 <script runat="server">

     protected void Page_Load(object sender, EventArgs e)
    {
        string script = @" function Hello(){alert ('Welcome to dotprogramming.blogspot.com');}";
        Page.ClientScript.RegisterClientScriptBlock(this.GetType(), "MY Code", script, true);
        
    }
</script>

 <html xmlns="http://www.w3.org/1999/xhtml">
<head runat="server">
    <title></title>
</head>
<body onload ="Hello()">
    <form id="form1" runat="server">
    
    </form>
</body>
</html>

Code Generate the following output

Run JavaScript code in Page_Load method, ASP.NET RegisterClientScriptBlock

Introducation to Pointer DataStructure, C Programming

 Pointer is a special type of variable that is used to store the memory address of another variable of free memory requested by the programmer or user during the execution of  the program. To understand dynamic data structures understanding pointer is definitely must. In simple words pointer is a variable that stores memory address whereas simple variables store data.

              For example, when variable is declared the memory is allocated to that variable by the compiler during the compilation of the program. Once memory is allocated the data can be stored in that memory location. The data is referred by the name of the variable. If the address of that variable is to be stored then the pointer variable is necessary. Consider the declaration statement of “C” language: int age;

            Assuming that during compilation memory address allocated variable age is 1000, and the address 1000 is to be stored in another variable that variable should be of the type pointer.
           In case of ‘C’ language the pointer variables are simply declared by means of prefixing an asterisk (*) to the variable name in a normal declaration statement. For example, int *page; declares a pointer variable page of the type int. Now page can be used to store the address of a simple integer variable. i.e. page = &age.
            When a pointer variable is declared, the memory is not allocated to such variable during the compilation. So it can point to any already allocated address of variable or an address of requested free memory. The type of free memory or variable should match with the type of pointer variable. Pointer variables are advantageous when they are used for dynamic memory allocation and function call by reference.

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