C# sort list [Generic List<T>]

c# sort list
Generic List in C# provides easy way to sort list. In C# some times we need to add data to generic list and sort list by ascending based on our need. C# .net provides .sort method for List that can be used for sorting the contents of list. We will see example to sort list in c#.

Sample code to sort list [C#]:


using System;
using System.Collections.Generic;

public class sortlist
{
public static void Main()
{
List<string> names =  new List<string>();
names.Add("John");
names.Add("Antony");
names.Add("Mickel");
names.Add("Daniel");
names.Sort();
Console.WriteLine();
foreach(string name in names)
{
Console.WriteLine(name);
}
}
}


//Output
//Antony
//Daniel
//John
//Mickel

Get checked checkboxes in jQuery

get checked checkboxes in jquery


In this post we are going to see how to get all the checked checkboxes using jQuery. Some time in asp.net applications we need to do operations at client side on controls like checkboxes, dropdown list, buttons…etc. Here we will see how to access checkboxes at client side using jQuery and how to get checked checkboxes. To get the checked checkboxes, jQuery provides selector :checked.

Sample code to get all checked checkboxes[jQuery – ASP.Net]

<input value="1" checked type="checkbox" name="numbers" />
<input value="2" type="checkbox" name="numbers" />
<input value="3" checked type="checkbox" name="numbers" />

Now to get only the checked checkboxes we will use below line of code that will store all the checked checkboxes as an array.


$checkedCheckboxes = $("input:checkbox[name=numbers]:checked");;

We can iterate though the checked checkbox array using .each and perform some operations or can get or set values to checkboxes.


var selectedValues="";
$checkedCheckboxes.each(function () {
selectedValues +=  $(this).val() +",";
});
);

Let's put all above code togather

<html xmlns="http://www.w3.org/1999/xhtml">
<head runat="server">
<script src="Scripts/jquery-1.4.1.js" type="text/javascript"></script>
<script src="Scripts/jquery-1.4.1.min.js" type="text/javascript"></script>
<title></title>
<script type="text/javascript">
$(document).ready(function () {
var selectedValues="";
$checkedCheckboxes = $("input:checkbox[name=numbers]:checked");
$checkedCheckboxes.each(function () {
selectedValues +=  $(this).val() +",";
});
alert(selectedValues);
});
</script>
</head>
<body>
<form id="form1" runat="server">
<div>
<input value="1" checked type="checkbox" name="numbers" />
<input value="2" type="checkbox" name="numbers" />
<input value="3" checked type="checkbox" name="numbers" />
</div>
</form>
</body>
</html>

//Output
//1,3

using jquery

C# DateTime Manipulation

Get IndexOf string in Javascript

string indexof in javascript
In JavaScript strings IndexOf() function is used to find position of specified character in the string. When IndexOf() method is used in javascript it returns position of first occurrence of the given character. If specified character is not found in string then it returns –1 value.

Syntax for IndexOf()


string.indexOf(searchstring, start)

Here search string is the character that is to be find and start is the position from which search to begin.

Example of IndexOf() Method [JavaScript]:


<html xmlns="http://www.w3.org/1999/xhtml">
<head runat="server">
<title></title>
<script type="text/javascript">
function GetStringIndex() { 
var str="Javascript IndexOf Method.";
document.write( "a is at position"+ str.indexOf("a") + "<br />");
document.write("IndexOf is at position"+ str.indexOf("IndexOf") + "<br />");
}
</script>
</head>
<body>
<form id="form1" runat="server">
<div>
<input type="button" value="Submit" onclick="return GetStringIndex();" />
</div>
</form>
</body>
</html>

//Output<
//a is at position 1
//IndexOf is at position 11

Split string JavaScript

split string in javascript
In JavaScript we need to split the string to perform some operations on string. JavaScript uses Split() method to split the given string in JavaScript. Split() method basically split string into array of substrings and generates new array.

String split Syntax:


string.split(separator, limit)

Here separator is a character by which we want to separate string. and limit is to give up to how many number split the string.

Sample to split string [JavaScript]


<script type="text/javascript">
 function splitString()
 {
  var str="Split Javascript String";
  document.write(str.split(" "));
 }
</script> 


//Output
//Split, Javascript, String

In above example of string split, we give space(“ ”) character to split the string with. so it splits the string with “ “ and returns array with substrings.

Get GridView SelectedIndexChanged event asp.net

gridview selectedindexchanged event
In this post we will see how to use SelectedIndexChanged Event of GridView in ASP.Net. SelectedIndexChanged event get fired when we click select button of the gridview row. We can use this event to perform some operation on form when row is selected like call custom routines, change labels, change titles..etc.

Sample code to see how SelectedIndexChanged event in gridview works [ASP.Net, C#]:


<asp:GridView ID ="GridView1" runat="server" 
onselectedindexchanged="GridView1_SelectedIndexChanged" AutoGenerateColumns="False"
DataSourceID="SqlDataSource1" AutoGenerateSelectButton="true">

<Columns>

<asp:BoundFieldDataField="ID"HeaderText="ID"SortExpression="ID" />

<asp:BoundFieldDataField="Name"HeaderText="Name"SortExpression="Name" />

<asp:BoundFieldDataField="Address"HeaderText="Address" SortExpression="Address" />

</Columns>

</asp:GridView>

<asp:SqlDataSourceID="SqlDataSource1"runat="server" ConnectionString="<
;%$ ConnectionStrings:PersonConnectionString %>" 
SelectCommand="SELECT * FROM [PersonInfo]"></asp:SqlDataSource>
</p>

<p>
<asp:labelid="lblMessage"forecolor="Red"runat="server"/>
</p>



Code behind for selectedIndexChanged Event:






protected void GridView1_SelectedIndexChanged(object sender, EventArgs e)

{
 
  GridViewRow row = GridView1.SelectedRow;
  
  lblMessage.Text = "Selected" + row.Cells[2].Text + ".";
}

Get Time part from datetime C#

Get time part from datetime

[C#] DateTime Format is often needed while coding in C#.net. Datetime formats are basically used for converting Date and Time into Specified String representation of DateTime.

In this post of C# Datetime Format, we will see how to get the time factor out of the DateTime. We can get Hour, Minute and Second from the DateTime. DateTime provides Properties for getting Hour, Minute and Second.

Sample code to get Hours, Minutes and Seconds from Date [C#]:

class Program  
{
 static void Main(string[] args)
  {
   DateTime date = DateTime.Now;
   Console.WriteLine("Hours= " + date.Hour);
   Console.WriteLine("Minutes= " + date.Minute);
   Console.WriteLine("Seconds= " + date.Second);
  }
}

Output of this program will show current Hours, Minutes and Seconds.

Datetime compare

compare datetime
Using C# Datetime, we can compare two dates. C# DateTime class provides Date.Compare method to compare dates. DateTime.Compare() method compares dates and returns an integer value. Using that integer value we can compare date whether date is less, or equal or greater that second date.

C# Datetime Compare Syntax:

public static int Compare(DateTime dt1,DateTime dt2)

Sample code to compare dates using DateTime.Compare() [C#]

public class StringToDateTime
    {
        public static void Main()
        {
            DateTime dt = new DateTime(2012, 1, 16);
            DateTime dt1 = new DateTime(2012, 1, 16);
            int result = DateTime.Compare(dt, dt1);

            if (result == 0)
             Console.WriteLine("Date is same as today's date");
        }
    }

//Output
//Date is same as today's date

Get DateTime Difference C#

Get DateTime difference

In [C#] DateTime Formats, C# Datetime provides verious ways to get the difference between dates. Using C# Datetime we can get difference betwwen two dates, we can get difference between days, difference between hours, difference between Minutes, difference between seconds.

DateTime class provides subtract method to get the difference between two dates.And using System.TimeSpan we can show the difference. We will see C# code that show how to use Subtract method and System.TimeSpan to calculate difference between two dates.

[C#] Example to get difference between two dates:

using System;
    namespace DateAndTimeDifferenceSample
    {
        class Program
        {
            static void Main(string[] args)
            {
                DateTime fromdt = new DateTime(2012, 1, 16);
                DateTime todt = new DateTime(2012, 2, 17);
                TimeSpan dtDiff = todt.Subtract(fromdt);
                Console.WriteLine(dtDiff);
            }
        }
    } 

//Output wiil show difference in days like below
//32.00:00:00

Using C# Datetime we can also get the difference in Hours, Minutes, And Seconds. Let’s see the C# example that show how to calculate difference in Hr, Mins, and in Secs.

Example to get difference for Hours, Minutes, and Seconds [C#]:
class Program
    {
        static void Main(string[] args)
        {
            DateTime fromdt = new DateTime(2012, 1, 16, 22, 01, 55);
            DateTime todt = new DateTime(2012, 2, 17, 23, 15, 00);
            TimeSpan dtDiff = todt.Subtract(fromdt);
            Console.WriteLine("Hours" + dtDiff.Hours);
            Console.WriteLine("Minutes" + dtDiff.Minutes);
            Console.WriteLine("Seconds" + dtDiff.Seconds);
        }
    }

//OutPut
//Hours= 1
//Minutes= 13
//Seconds = 5

Parse date in C#

c# parse date

In this post we will look how the string with date and time to be converted to DateTime. DateTime class provides Parse() method that takes string parameter that contains date and time. We can convert below kind of string to DateTime using DateTime.Parse() method: DateTime.Parse() method converts given string representation of date and time to it’s DateTime equivalent.


Sample code to convert string to DateTime using DateTime.Parse() [C#]


using System;
 public class StringToDateTime
 {
   public static void Main()
   {
     string myDateTimeValue = "2012-01-16 15:02:26";
     DateTime myDateTime = DateTime.Parse(myDateTimeValue);
     Console.WriteLine(myDateTime);
   }
 }


//Output
//16/01/2012 15:02:26

Add Years to date

add years in date
In C# programming some times we  need to add years to the current year. This situation happens when we need to keep things in some date range. Means for example if I want to show date range from this year to next or next two years or specified years then we can use DateTime.AddYears Method.


DateTime AddYears Syntax:

public DateTime AddYears(int value);


Sample code that show how to add year in DateTime[C#] :

using System;
using System.Globalization;
public class DateTimeAddYear
{
public static void Main()
{
DateTime selectedDate = DateTime.Parse("2 Jan 2007");
selectedDate = selectedDate.AddYears(2);
Console.WriteLine(selectedDate.ToString("dd MMM yyyy"));   
}
}

//Output
//2 Jan 2009

Add days in date

add days to datetime

Some times we need to add days in the date. This is needed when we want to give some days duration to perform some actions based on date.For example if we want to publish some article for two days and then hide or delete it after two days.So to add days in given date we need to use DateTime.AddDays Method


Syntax:


public DateTime AddDays(double value)

Sample code to add days in date[C#]:


using System;
using System.Globalization;
public class DateTimeAddYear
{
public static void Main()
{
DateTime selectedDate = DateTime.Parse("12 Jan 2012");
selectedDate = selectedDate.AddDays(2);
Console.WriteLine(selectedDate.ToString("dd MMM yyyy")); 
}
}//Output
//14 Jan 2012

Get Today’s Date

Get today's date
When dealing with dates most of the time we need to get current date or today’s date in C# code to perform some operations. DateTime class provides DateTime.Today property to get today’s date. Today property returns current date only and does not include time in it so we can use Today property in code where we just need today’s date and not time. Then we can use .ToString() to format string date as per our need.


Sample code to get today’s or current date [C#]


using System;
using System.Globalization;
public class DateTimeAddYear
{
public static void Main()
{
// Get current date.
DateTime todaysDate = = DateTime.Today;
//And show today's date in needed format
Console.WriteLine(todaysDate.ToString("dd MMM yyyy"));
}
}
//Output
//12 Jan 2012

Get only date part from datetime

get date part only datetime
In some cases we need to get the date with date and time with midnight time like 00:00:00 in C# code to perform some operations. DateTime class provides DateTime.Date property to get date and time with time like 00:00:00.

Sample code to get today’s or current date [C#]


using System;
using System.Globalization;
public class DateTimeAddYear
{   
public static void Main()
{
DateTime selectedDate = DateTime.Parse("12 Jan 2012");
Console.WriteLine(selectedDate.Date);  
}
}
//Output
//2 Jan 2009

Get full name of the day C# datetime

get day name datetime c#
In most C# programs while formatting the dates we need to show complete or full name of the day. Here we are going to see how “dddd” format specifier is used to show full name of the day.

Sample code to show the full name of the day [C#]

using System;
using System.Globalization;
public class Example
{
public static void Main()
{
DateTime dateToFormat =  new DateTime(2008, 8, 29, 19, 27, 15); 
Console.WriteLine(dateToFormat.ToString("dddd"));
}
}
//Output
//Friday

Date in Month Day, Year Format (MMMM dd, yyyy)

format datetime in Month Day, Year
Some times we need to show date in Month Day, Year Format like January 12, 2012. Here we will see how to format DateTime using string formatter.

Sample code to show date time in Month Day, Year format [C#]


using System;
using System.Globalization;

public class DateTimeFomrateString
{
 public static void Main()
 {
  DateTime datetoFormat = new DateTime(2012, 1, 12);
  Console.WriteLine("Today's Date is " + datetoFormat.ToString("MMMM dd, yyyy") + ".");
 }
}
//Code will display the following output:
//Today's Date is June 10, 2011.

Here MMMM is format specifier that represents month as name like for 05 it will display May. dd is format specifier from day of the month with digits from 01 to 31 and yyyy is the format specifier with four digit number like 2012.

Date in MM-dd-yy format

get date in MM-dd-yy format
Most of the time in C# code we need to format datetime as per requirement. Here we are going to discuss how to format date in MM-dd-yy format.So when we give input date as “10-29-11” then date will get formatted like “10/29/11”.

Sample code to format date in MM-dd-yy format [C#] :


using System;
using System.Globalization;

public class DateFormatSample
{
 public static void Main()
 {
  string dateToFormat = "10-29-11";
  string strFormatPattern = "MM-dd-yy";
  DateTime formattedDate;
  DateTime.TryParseExact(dateToFormat, strFormatPattern, null, 
  DateTimeStyles.None, out formattedDate);
  Console.WriteLine("Date '{0}' Formatted to {1:d}.", dateToFormat, formattedDate);
 }
}
//    output:
//    Date '12-30-11' Formatted to 12/30/2011.

Here MM displays in format 01 to 12, dd represents Day of the month with range from 01 to 31 and yy is year from 00 to 99.

do Postback in Javascript [ASP.NET]

dopostback javascript
In this post we will see how to postback page in ASP.NET from the client side using JavaScript. In some cases we need to postback page from client side i.e. by using JavaScript.
We can use __doPostBack() to postback page from client script using JavaScript.Or we can use Page.GetPostBackEventReference() to do postback from JavaScript. When we use Page.GetPostBackEventReference() it internally get converted to __doPostBack().

Sample that shows how to do postback from JavaScript [ASP.NET, C#]:


< input type="button" id="BaseButton1" onclick="submitPage()" value="OK"/>

Now after clicking on button it will call JavaScript function that will do the postback and then in page load we will capture and perform the operation that is needed.In code behind we use Request[ "__EVENTARGUMENT"] to get the request so that we can perform some operation on that event argument.So below is JavaScript function that uses Page.GetPostBackEventReference() and do the postback from Javascript.


function submitpage() 
{ 
  // trigger postback from JavaScript
   <%= this.Page.GetPostBackEventReference(this,"Delete")%> 
} 


GetPostBackEventReference Here “this” parameter in Page.GetPostBackEventReference(this, “Delete”) is the controls id and referred to as __EVENTTARGET and accessed using Request[“__EVENTTARGET”] in code behind to determine which control caused postback from JavaScript.And “Delete” is __EVENTARGUMENT and accessed using Request[ "__EVENTARGUMENT"] in code behind.

So now in code behind we can check for Request[ "__EVENTARGUMENT"] and perform some operations based on that condition like:


protected void Page_Load(object sender, EventArgs e) 
{ 
string eventArg = Request["__EVENTARGUMENT"]; 
if (!String.IsNullOrEmpty(eventArg)) 
{ 
 if(eventArg == "Delete")
 DeleteRecords();
}
} 

private void DeleteRecords() 
{ 
 //Do something
} 

List to array c#

array to list
In this post we will se how to convert list to array.We need to convert list to array many times in C# programming. Converting list to array can be done by various ways. We are going to see C# examples to convert the list to array.

we will see the way to convert list to an array. we use .ToArray() parameter less instance method that converts list to an array. Below example shows how list get converted in to array using .ToArray() method:

Example to convert list to array [C#]

using System;
using System.Collections.Generic;

class Program
{
 static void Main()
 {
  // List to convert into Array.
  List<string> lstString = new List<string>();
  lstString.Add("Convert");
  lstString.Add("List");
  lstString.Add("TO");
  lstString.Add("Array");
  // use .ToArray() Method to convert list to array
  string[] strArray = lstString.ToArray();
 }
}

Array to List [C#]

convert array to list

Some times we need add elements of an array to list in C# programming. We can use .Add() method of List class to add array elements to the List.Using . we also can use .Add() method to while converting array to List.

We will see example that will show how used .Add method to convert array to List. Here we iterate through array elements and then one by one we add those elements to List.



using System.Collections.Generic; 

protected void Button1_Click(object sender, EventArgs e) 
{     
 string[] arrStr = { "Add", "Array", "Elements", "To", "List", "C#" };      
 List <string> strList = new List<string>();     
 foreach (string stritem in arrStr)    
 {          
  lstString.Add(stritem);    
 }      
}

Base64 to String [C#]

C# convert string to base64

In this post we will see how to convert Base64 string to string. .Net provides .FromBase64String() method in System.Convert class to convert Base64 string to string. While converting Base64 string to string it first converts base64 string to byte array and then byte array converted to string.

Sample code to convert Base64 string to string [C#]


//Convert Base64 string to string
public static string Base64ToString(string strBase64)       
{  
byte[] byteArray = Convert.FromBase64String(strBase64);            
return(System.Text.Encoding.UTF8.GetString(byteArray));        
}