Returns Radio Button Input element using Html.RadioButton() handler: MVC

Html.RadioButton() handler, used to return radio button input element to be input true or false value by user. Checked radio button will return true and un-checked will return false, otherwise it returns null to store/use the value.

Html.RadioButton() handler method is used to present mutually exclusive option i.e. true of false. Using this radiobutton method makes it easy to bind to view data or model is so easy in compare to using simple input radio element. This handler provides mostly same features as Html.CheckBox() handler discussed earlier.

Parameters

• htmlHelper: specify html helper instance that this method extends.
• name: specify name of input element used to access the value in controller.
• value: specify value of radio button element. If none is assigned then this attribute is used to access the value.
• isChecked: to be set true of false for radio button. True to select the element, OW false.
• htmlAttributes: specify an object that contains html attributes to set for the element.
   e.g Html.RadioButton(“gender”)

Html.RadioButtonFor(…)

Having the same functionality as Html.RadioButton() but it returns radio button element for each property passed via the model from controller’s action. This handler have two types of type parameters i.e. TModel (specify type of model) and TProperty (specify type of value).

Parameters

• htmlHelper: specify html helper instance that this method extends.
• expression: used to identifies object containing the property to render.
• value: specify value of radio button element. If none is assigned then this attribute is used to access the value.
• htmlAttributes: specify an object that contains html attributes to set for the element.

e.g Html.RadioButtonFor(model=>model.Gender)

Render radio button input for the property gender passed via controller. Submitting form will assign the value of this radio button to model’s gender property to be accessed in the controller’s action.

Returns Password input element using Html.Password() Handler: MVC

Html.Password() handler, used to return password input element to be input password value by user. This article describes about to using password html helper that will make text unreadable by other users in MVC application.

Like all other input elements, using Html.Password() html handler users are not able to read input value. This handler is mostly used in login process of any ASP.Net MVC application because of some special features of this helper.

This helper commonly have following features:

• Text input in the control is un-readable.
• Does not allow user to copy the text input in the control.
• Does not repopulate its value from ModelState object.

Parameters

• htmlHelper: html helper instance that this method extends.
• name: used to specify the name of form field that may be used to look up the value.
• value: specify the value of this element.
• htmlAttributes: specify html attributes to be set for the element like placeholder, id, any class or other values.

Overall this will generate an input element having the type password on the page:
<input type=”password” runat=”server” id=”password” />

Html.PasswordFor(…)

Provide same functionality but used to render password input element for each property passed via model. Here the model is the class for which the view is to be created. This handler have two type parameter i.e. TModel (specify type of model) and TProperty (specify type of value).

Parameters

• htmlHelper: html helper instance that this method extends.
• expression: used to identifies object that contains property to render.

Html.PasswordFor(model=>model.Password)

this line will render an input element of type password having id "Password" passed by the model. After submitting form, the value of this element will assigned to the password field of the model and can be easily accessed for further use.

How to find no of days between two different date objects in asp.net

We have already discussed about that article , but today we add two months in current date time object , after that i will find how many days remaining from the current date and time. Lets take an simple example
<form id="form1"
     runat="server">
    <asp:Button ID="Button1"
    runat="server"
    onclick="Button1_Click"
    Text="Click"
    Width="71px" />
    <div>  
    <asp:Label ID="Label1"
    runat="server"
    BackColor="Yellow"
    Text="Label"></asp:Label>  
    </div>
    </form>
Code Behind
 protected void Button1_Click(object sender, EventArgs e)
        {

            DateTime today = DateTime.Today;
            Label1.Text = "today : " + today.ToLongDateString();
            DateTime twoMonthLater = today.AddMonths(2);
            TimeSpan TS = twoMonthLater - today;
            int days = TS.Days;
            Label1.Text += "<br ><br />after two month: ";
            Label1.Text += twoMonthLater.ToLongDateString();
            Label1.Text += "<br ><br />This is difference between to datetime object in days:";
            Label1.Text += days;
        }

  Code Generate the following output

C# - Arrays

Introduction

If we create a variable of type int also assign 10 as value in it. If we want to store more than one value in it then its not possible. That why array comes to the picture, If you want to store similar type and more then one value into it then should take array.

Array Definition 

"An array is a collection of similar data type or you can say a single variable hold multiple other variables, those variable known as label of array. Lets take an simple example, suppose you have two things, which are ball and bat and you want to store it, use a box. Put the both things in separate boxes, also with label. Here 'array' is a box and label is 'variable name'.

Basically array consists of two things first one is index and second one is value, If you want to access specific value in an array, use index. When we insert items into an array, default index started from 0. You can insert items randomly at any index position. Lets take an example for clarification that how to insert item into an array. Before learn this example, first should take array declaration.

Syntax of declaring array

datatype [] identifier;

where, you can use any data type to declare an array like int , float, double, string etc. This bracket [] known as rank of the array, its doesn't take decimal type value , always take integer. The value in the rank known as size of the array. Suppose i take 10 in the rank, then array index start from 0 to 9. Here 0 is the starting index and 9 is the last index. All arrays value consists of contiguous memory locations. The lowest address corresponds to the first element and the highest address to the last element.

Lets more about an array that is how to initialize array variable. 

Array initialization means you can assign some values in to the array. 

Before initialization, should take new keyword for create instance of the array because array is a reference type. For example

int[] employee_age = new int[10];

In above mentioned example array hold 10 elements, means size of the array is 10. If you want to assign value in it, you can use index number. Like

employee_age[0] = 20;

employee_age[1] = 40;

Also You can assign values to the array at the time of declaration, like:

int [] employee_age = {20,21,22,23,24};
You can also create and initialize an array, like:
int [] employee_age = new int[5]  {20,21,22,23,24};
In the preceding example you can change the size of element, directly you can say re-sizing of an array. Also you can copy one array to another array in c#. In that case both array would locate to same memory location. like takes an simple example

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;

namespace ConsoleApplication4
{
    class Program
    {
        static void Main(string[] args)
        {

            int[] employee_age = new int[5]{20,21,22,23,24};
            int[] second_array = employee_age;
            int i = 0;
            foreach (var item in second_array)
            {
                Console.WriteLine("arrays elements are[{0}]={1}",i,item);
                i++;
            }
            Console.ReadKey();
        }
    }
}

Code generate the following output

Above mentioned example covers declaring of an array, initialization of array and how to access array element in c#.

In c#, when we create a new array in the memory then compiler automatically initialize all index value with 0. Take a look.

 using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;

namespace ConsoleApplication4
{
    class Program
    {
        static void Main(string[] args)
        {

            int[] employee_age = new int[5];
            int[] second_array = employee_age;
            int i = 0;
            foreach (var item in second_array)
            {
                Console.WriteLine("arrays elements are[{0}]={1}",i,item);
                i++;
            }
            Console.ReadKey();
        }
    }
}

Code generate the following output

C# - Variables

A variable is everything in programming, in which we can store values also change it during program execution. Before declare a variable in c#, must use type of it, so you say Each variable in C# has a specific type. You can perform multiple operation on a single variable, which value stored in memory. Now in this topic we will cover

1. How to declare a variable

2. How to internalize a variable.

3. Types of a variable

1. How to declare a variable

 during the declaration of a variable, we use type of it. Through comma separation we declare multiple variable with single type. Lets take a simple syntax with example.

Syntax of single variable declaration 

<data_type> single_variable_declaration;

Example of single variable declaration

int Employee_age;

Syntax of list of variable declaration

<data_type> variable1, variable2, .....variableN;

Example of list of variable declaration

String Employee_Name, Employee_address, Employee_Country;

2. How to initialize a variable

The meaning of initialization is assigning some value into the variable. There are two types of initialization, first one is declaration time initialization, in which we can assign some value into the variable at declaration time. Lets take simple example

int employee_age=24;

In this example we are passing value(24) from the right side to left side. Also here we use assignment operator, In later session we will discuss about operators.

The last one is after declaration, in which we can pass the value into the variable after declaration of it. Like

int a,b,c; // Declaration over

a=10 ; // after initialization 

b=20 ; // after initialization 

c=a+b; // expression initialization

3. Types of a variable

In the c#, there are two types of variable, first one is local variable and second one is global variable. If we initialize a variable outside the block known as global variable you can consider public specifier as a example of it. If we initialize it inside the block known as local variable. lets take a simple example.

using System;

using System.Collections.Generic;

using System.Linq;

using System.Text;

namespace ConsoleApplication4

{

    class Program

    {

        static void Main(string[] args)

        {

            int a = 10;

            {

                int b;

                a = 20;

                Console.WriteLine(a);

            }

            b = 30;  // b is a local variable , can't initialize here. 

            Console.WriteLine(a);

            Console.ReadKey();

        }

    }

}

In this program we get error because a local variable can't initialize outside the block.

C# - Type Conversion

In Type casting you can change types or convert one types of data into another type.In c#, Basically there are two types. First one implicit type casting and another one is explicit type casting. Both are very useful in c# application development like, in web application text box return by default text value and you want to take int type value then you must convert text to int.
Implicit type conversion - conversion is performed by c# compiler automatically with type-safe manner. Now lets to take an simple example here.

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;

namespace ConsoleApplication4
{
    class Program
    {
        static void Main(string[] args)
        {
            Double d;
            int a=15;
            d = a;
            Console.Write(d.ToString());
            Console.ReadKey();
        }
    }
}

Code Generate the following output

Explicit type conversion - conversion is performed by programmer explicitly using the pre-defined functions. Suppose you want to change double type value into int type then must use pre-defined functions. This type of conversion is not safe. Lets take an simple example.

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;

namespace ConsoleApplication4
{
    class Program
    {
        static void Main(string[] args)
        {
            Double d = 3.14;
            int a;
            a = (int)d;
            Console.Write(a.ToString());
            Console.ReadKey();
        }
    }
}

Code generate the following output

So there are various types available in c#, these are

ToBoolean : Convert one type to boolean type , if possible

ToByte : Convert one type to Byte type , if possible

etc.

How to add image and icon on button control in windows form c#

On a Button control, Text is not enough to making it beautiful. So If you want to make attractive windows application then you should go for images. In this article i will show you how to add image on button control also how to align with text. Now lets to start.
Step-1 : Add a new windows form project in visual studio, i have visual studio 2013, you can work in earlier version.
Step-2 : Add a button control in designer view of form
Step-3 : Select 'Image' property of Button control. Button control-->Property-->Image

Step-4 : Click on "ok" Button
Step-5 : After adding the image on button control, Set "ImageAlign" property of Button control to MiddleLeft.
Step-6 : Also set "TextAlign" property of Button control to MiddleRight.
Step-7 : Set Text Property of button control, decide you. In this article button with image is related to fruits so i giving you fruits title.
Text = " Fruits"
Now, your button control looking like