Check / Unheck all checkboxes of HTML Table

Lets we have a HTML Table whose id=tblemail and it contain many rows and every row contains a check box.. and this HTML table contains check box in its header.. so when i click on checkbox of header then all checkboxes of rows of that table should be checked/ unchecked according to check box in header...

< table id="tblemail" border="1" style="text-align: left" width="80%" class="border" >
< tr >
< th >
Select Your choices
< /th >
< th >
< asp:CheckBox ID="cbSelectAll" runat="server" / >
< /th >
< /tr >
< tr >
< td >
I want to send message
< /td >
< td >
< asp:CheckBox ID="chkmsg" runat="server" / >
< /td >
< /tr >
< tr >
< td >
i want to receive message
< /td >
< td >
< asp:CheckBox ID="chkrcvmsg" runat="server" / >
< /td >
< /tr >

< /table >




below is java script function code to check/uncheck all checkboxes of a HTML table:
< script language="javascript" type="text/javascript" >

function SelectAll(id) {

var frm = document.getElementById('tblemail').getElementsByTagName("input");
var len = frm.length;

for (i=0;i< len;i++)
{
if (frm[i].type == "checkbox")
{
frm[i].checked = document.getElementById(id).checked;
}
}


}

< /script >



add below line in page_load so that it will add click event to selectall check box:
Protected Sub Page_Load(ByVal sender As Object, ByVal e As System.EventArgs) Handles Me.Load

If (Not IsPostBack) Then
cbSelectAll.Attributes.Add("onclick", "javascript:SelectAll('" & cbSelectAll.ClientID & "')")
end if
end sub

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What is the difference between Server.Transfer and Response.Redirect? Why would I choose one over the other?

Server.Transfer transfers page processing from one page directly to the next page without making a round-trip back to the client's browser. This provides a faster response with a little less overhead on the server. Server.Transfer does not update the clients url history list or current url. Response.Redirect is used to redirect the user's browser to another page or site. This performas a trip back to the client where the client's browser is redirected to the new page. The user's browser history list is updated to reflect the new address.

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What methods are fired during the page load?

Init() - when the page is instantiated
Load() - when the page is loaded into server memory
PreRender() - the brief moment before the page is displayed to the user as HTML
Unload() - when page finishes loading.

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What is the difference between Response.Write() andResponse.Output.Write()?

Response.Output.Write() allows you to write formatted output.
for eg:
it is very similer to console.write which we use in c#.net(console programming)
we use place holders for formated output...

Response.Output.Write("

Item: {0}, Cost: ${1}

",item.Description, item.Cost);

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What is the role of inetinfo.exe, aspnet_isapi.dll andaspnet_wp.exe in the page loading process?

inetinfo.exe is the Microsoft IIS server running, handling ASP.NET requests among other things.When an ASP.NET request is received (usually a file with .aspx extension), the ISAPI filter aspnet_isapi.dll takes care of it by passing the request to the actual worker process aspnet_wp.exe.

actually mainly inetinfo.exe:
Inetinfo.exe is the ASP.Net request handler that handles the requests from the client .If it's for static resources like HTML files or image files inetinfo.exe process the request and sent to client. If the request is with extension aspx/asp, inetinfo.exe processes the request to API filter.

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What is the maximum possible length of a query string?

Many of times this question have been asked while interview or we also should know that how much characters a query string can contain....

Although the specification of the HTTP protocol does not specify any maximum length, practical limits are imposed by web browser and server software.

Microsoft Internet Explorer (Browser)

Microsoft states that the maximum length of a URL in Internet Explorer is 2,083 characters, with no more than 2,048 characters in the path portion of the URL. In my tests, attempts to use URLs longer than this produced a clear error message in Internet Explorer.

Firefox (Browser)

After 65,536 characters, the location bar no longer displays the URL in Windows Firefox 1.5.x. However, longer URLs will work. I stopped testing after 100,000 characters.

Safari (Browser)

At least 80,000 characters will work. I stopped testing after 80,000 characters.

Opera (Browser)

At least 190,000 characters will work. I stopped testing after 190,000 characters. Opera 9 for Windows continued to display a fully editable, copyable and pasteable URL in the location bar even at 190,000 characters.

Apache (Server)

My early attempts to measure the maximum URL length in web browsers bumped into a server URL length limit of approximately 4,000 characters, after which Apache produces a "413 Entity Too Large" error. I used the current up to date Apache build found in Red Hat Enterprise Linux 4. The official Apache documentation only mentions an 8,192-byte limit on an individual field in a request.

Microsoft Internet Information Server (Server)

The default limit is 16,384 characters (yes, Microsoft's web server accepts longer URLs than Microsoft's web browser). This is configurable.

Perl HTTP::Daemon (Server)

Up to 8,000 bytes will work. Those constructing web application servers with Perl's HTTP::Daemon module will encounter a 16,384 byte limit on the combined size of all HTTP request headers. This does not include POST-method form data, file uploads, etc., but it does include the URL. In practice this resulted in a 413 error when a URL was significantly longer than 8,000 characters. This limitation can be easily removed. Look for all occurrences of 16x1024 in Daemon.pm and replace them with a larger value. Of course, this does increase your exposure to denial of service attacks.

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Date Difference in JavaScript

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Make HTML textbox readonly

to make html textbox readonly follow below steps:
make Html textbox runat="server"

and in codding write
txtname.Disabled = True

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Optional Nullable Parameter introduced in VB.NET 10

In previous editions like .net framework 2.0/3.0/3.5 we were not able to create a Optional parameter as a nullable in vb.net. but now its time to get happy. you can create Nullable Optional Parameter in VB.NET 10.

eg:

Sub MyFunc(ByVal _name As String, ByVal _email As String, Optional ByVal _age As Integer? = Nothing)
your code
end sub



Benefit: The benefit of Nullable Optional Parameter is that if you want to pass value then it will take value if you will not pass value then it will take 'Nothing' in that parameter then before using that parameter you can easily check that value is Nothing or not

like:

if _age isnot Nothing then
your code
end if

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Improve Query Performance using "With" Clause

Using with clause we can improve query performance.
Read complete Article

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Open popup window using JavaScript

if we want to open a popup window using javascript we can do it by using following function:
javascript:showWindow('mypage.aspx"',800,600,50)

How to use it?

if you want to open popup window using Anchor tag of Html:
< a href='javascript:showWindow('mypage.aspx"',800,600,50)' >click me< /a >

open popup window using Html Button:

< input type="button" id="btnmap" name="btnmap" value="Map" onclick ='javascript:showWindow(< %# """MapDSHotelDetail.aspx?hotelname=" &container.dataitem("hotelname")& "&cityid=" & container.dataitem("cityid") & "&countryid=" & ddlcountry.selectedvalue &"""" % >,800,600)'/ >

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Colors in CSS

If you are not a regular regular designer or you don't remember names of different colors provided by CSS.Then this is list of all Mostly used colors of CSS:

Color Name	HEX	Color	Shades	Mix
AliceBlue	#F0F8FF		Shades	Mix
AntiqueWhite	#FAEBD7		Shades	Mix
Aqua	#00FFFF		Shades	Mix
Aquamarine	#7FFFD4		Shades	Mix
Azure	#F0FFFF		Shades	Mix
Beige	#F5F5DC		Shades	Mix
Bisque	#FFE4C4		Shades	Mix
Black	#000000		Shades	Mix
BlanchedAlmond	#FFEBCD		Shades	Mix
Blue	#0000FF		Shades	Mix
BlueViolet	#8A2BE2		Shades	Mix
Brown	#A52A2A		Shades	Mix
BurlyWood	#DEB887		Shades	Mix
CadetBlue	#5F9EA0		Shades	Mix
Chartreuse	#7FFF00		Shades	Mix
Chocolate	#D2691E		Shades	Mix
Coral	#FF7F50		Shades	Mix
CornflowerBlue	#6495ED		Shades	Mix
Cornsilk	#FFF8DC		Shades	Mix
Crimson	#DC143C		Shades	Mix
Cyan	#00FFFF		Shades	Mix
DarkBlue	#00008B		Shades	Mix
DarkCyan	#008B8B		Shades	Mix
DarkGoldenRod	#B8860B		Shades	Mix
DarkGray	#A9A9A9		Shades	Mix
DarkGreen	#006400		Shades	Mix
DarkKhaki	#BDB76B		Shades	Mix
DarkMagenta	#8B008B		Shades	Mix
DarkOliveGreen	#556B2F		Shades	Mix
Darkorange	#FF8C00		Shades	Mix
DarkOrchid	#9932CC		Shades	Mix
DarkRed	#8B0000		Shades	Mix
DarkSalmon	#E9967A		Shades	Mix
DarkSeaGreen	#8FBC8F		Shades	Mix
DarkSlateBlue	#483D8B		Shades	Mix
DarkSlateGray	#2F4F4F		Shades	Mix
DarkTurquoise	#00CED1		Shades	Mix
DarkViolet	#9400D3		Shades	Mix
DeepPink	#FF1493		Shades	Mix
DeepSkyBlue	#00BFFF		Shades	Mix
DimGray	#696969		Shades	Mix
DodgerBlue	#1E90FF		Shades	Mix
FireBrick	#B22222		Shades	Mix
FloralWhite	#FFFAF0		Shades	Mix
ForestGreen	#228B22		Shades	Mix
Fuchsia	#FF00FF		Shades	Mix
Gainsboro	#DCDCDC		Shades	Mix
GhostWhite	#F8F8FF		Shades	Mix
Gold	#FFD700		Shades	Mix
GoldenRod	#DAA520		Shades	Mix
Gray	#808080		Shades	Mix
Green	#008000		Shades	Mix
GreenYellow	#ADFF2F		Shades	Mix
HoneyDew	#F0FFF0		Shades	Mix
HotPink	#FF69B4		Shades	Mix
IndianRed	#CD5C5C		Shades	Mix
Indigo	#4B0082		Shades	Mix
Ivory	#FFFFF0		Shades	Mix
Khaki	#F0E68C		Shades	Mix
Lavender	#E6E6FA		Shades	Mix
LavenderBlush	#FFF0F5		Shades	Mix
LawnGreen	#7CFC00		Shades	Mix
LemonChiffon	#FFFACD		Shades	Mix
LightBlue	#ADD8E6		Shades	Mix
LightCoral	#F08080		Shades	Mix
LightCyan	#E0FFFF		Shades	Mix
LightGoldenRodYellow	#FAFAD2		Shades	Mix
LightGrey	#D3D3D3		Shades	Mix
LightGreen	#90EE90		Shades	Mix
LightPink	#FFB6C1		Shades	Mix
LightSalmon	#FFA07A		Shades	Mix
LightSeaGreen	#20B2AA		Shades	Mix
LightSkyBlue	#87CEFA		Shades	Mix
LightSlateGray	#778899		Shades	Mix
LightSteelBlue	#B0C4DE		Shades	Mix
LightYellow	#FFFFE0		Shades	Mix
Lime	#00FF00		Shades	Mix
LimeGreen	#32CD32		Shades	Mix
Linen	#FAF0E6		Shades	Mix
Magenta	#FF00FF		Shades	Mix
Maroon	#800000		Shades	Mix
MediumAquaMarine	#66CDAA		Shades	Mix
MediumBlue	#0000CD		Shades	Mix
MediumOrchid	#BA55D3		Shades	Mix
MediumPurple	#9370D8		Shades	Mix
MediumSeaGreen	#3CB371		Shades	Mix
MediumSlateBlue	#7B68EE		Shades	Mix
MediumSpringGreen	#00FA9A		Shades	Mix
MediumTurquoise	#48D1CC		Shades	Mix
MediumVioletRed	#C71585		Shades	Mix
MidnightBlue	#191970		Shades	Mix
MintCream	#F5FFFA		Shades	Mix
MistyRose	#FFE4E1		Shades	Mix
Moccasin	#FFE4B5		Shades	Mix
NavajoWhite	#FFDEAD		Shades	Mix
Navy	#000080		Shades	Mix
OldLace	#FDF5E6		Shades	Mix
Olive	#808000		Shades	Mix
OliveDrab	#6B8E23		Shades	Mix
Orange	#FFA500		Shades	Mix
OrangeRed	#FF4500		Shades	Mix
Orchid	#DA70D6		Shades	Mix
PaleGoldenRod	#EEE8AA		Shades	Mix
PaleGreen	#98FB98		Shades	Mix
PaleTurquoise	#AFEEEE		Shades	Mix
PaleVioletRed	#D87093		Shades	Mix
PapayaWhip	#FFEFD5		Shades	Mix
PeachPuff	#FFDAB9		Shades	Mix
Peru	#CD853F		Shades	Mix
Pink	#FFC0CB		Shades	Mix
Plum	#DDA0DD		Shades	Mix
PowderBlue	#B0E0E6		Shades	Mix
Purple	#800080		Shades	Mix
Red	#FF0000		Shades	Mix
RosyBrown	#BC8F8F		Shades	Mix
RoyalBlue	#4169E1		Shades	Mix
SaddleBrown	#8B4513		Shades	Mix
Salmon	#FA8072		Shades	Mix
SandyBrown	#F4A460		Shades	Mix
SeaGreen	#2E8B57		Shades	Mix
SeaShell	#FFF5EE		Shades	Mix
Sienna	#A0522D		Shades	Mix
Silver	#C0C0C0		Shades	Mix
SkyBlue	#87CEEB		Shades	Mix
SlateBlue	#6A5ACD		Shades	Mix
SlateGray	#708090		Shades	Mix
Snow	#FFFAFA		Shades	Mix
SpringGreen	#00FF7F		Shades	Mix
SteelBlue	#4682B4		Shades	Mix
Tan	#D2B48C		Shades	Mix
Teal	#008080		Shades	Mix
Thistle	#D8BFD8		Shades	Mix
Tomato	#FF6347		Shades	Mix
Turquoise	#40E0D0		Shades	Mix
Violet	#EE82EE		Shades	Mix
Wheat	#F5DEB3		Shades	Mix
White	#FFFFFF		Shades	Mix
WhiteSmoke	#F5F5F5		Shades	Mix
Yellow	#FFFF00		Shades	Mix
YellowGreen	#9ACD32		Shades	Mix

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Refresh Current Page Using Asp.net Code

below code can be use to refresh the current page at server side event:

Page.Response.Redirect(Page.Request.Url.ToString(), true);

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Refresh Current Page using JavaScript

Sometimes we need to refresh our current page by clicking on some button (not refresh button of browser). To refresh page you need to call below function:

function refreshMe()
{
location.reload(true);
}

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Refresh Parent Page from Popup/child page

some time we have a datagrid/gridview in parent form and we add new values or we remove value from existing grid by using a popup from and we want that when we finish our add/delete/update from popup/child page my parent form should automatically get refresh so i can see the changes i have done in popup form.
write the following code in your page:

< script language="javascript" type="text/javascript" >
function closeme()
{
opener.location.reload();
window.close();
}
< /script >


< input id="btnClose" class="form-button" onclick="closeme()" type="button" value="Close" / >

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Select single Radio in DataGrid using JavaScript

some times we need to select a single row from a grid and for that we place a extra column in it. which contain a radio button in it. and we want that only one radio of that column should be selected. so to select single radio button in Grid using JavaScript (client side script) we need to write below code:

if your radio is 'runat="Server"' then below code will help you.
java Script function:

< script language="javascript" type="text/javascript" >
function selectOne(rdoId,gridName)
{
var rdo = document.getElementById(rdoId);
/* Getting an array of all the "INPUT" controls on the form.*/
var all = document.getElementsByTagName("input");
for(i=0;i< all.length;i++)
{
/*Checking if it is a radio button, and also checking if the
id of that radio button is different than "rdoId" */
if(all[i].type=="radio" && all[i].id != rdo.id)
{
var count=all[i].id.indexOf(gridName);
if(count!=-1)
{
all[i].checked=false;
}
}
}
rdo.checked=true;/* Finally making the clicked radio button CHECKED */
}

< /script >


Below is code for grid:
< asp:GridView ID="datagrid1" runat="server" AutoGenerateColumns="false" >
< Columns >
< asp:TemplateField HeaderText="Select" >
< ItemTemplate >
< asp:RadioButton id="rdobutton" runat="server" OnClick="javascript:selectOne(this.id,'datagrid1');" >< /asp:RadioButton > < /ItemTemplate >
< /asp:TemplateField >
< /Columns >
< /asp:GridView >




======If your radio is not run at server===========
If your radio is not run at server then you just need to make ID and Name field as a same value and thats sit.. nothing to do extra... you will be able to select only one of then..

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Show Data in Hindi Without Installing Font at Client Side

By using Unicode you can show data in any language without installing Font at client side.
for that you need to create a table in database and create a field with nvarchar datatype. then store your language data in that field. and directly show that data on page... it will not need any font to be installed

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Show Asp.net Calender in Hindi

if you want to show asp.net calender in hindi as show above then you will have to do following:

< %@ Page Culture="hi-IN" uiculture="hi-IN" Language="vb"
% >
< html >
< head >
< title >Simple Sample - Hindi< /title >
< /head >
< body >
< form runat="Server" >
< asp:Calendar id="C1" runat="server"
DayNameFormat="Full" >< /asp:Calendar >
< /form >
< /body >
< /html >

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Download any file or image from internet

If you have got URL of images and you want to download that files to your harddisk from internet then this function will help u:
NOTE: remember that your URL must contain protocol name like "http://"
eg: "http://www.mywebsite.com/aa.jpg"

My.Computer.Network.DownloadFile(Url, "c:\myfolder" & "\" & Url.Substring(url.LastIndexOf("/") + 1))

in above code "Url" is your file Url on internet
and second parameter is where you want to save file.. in above sample code it will get the file name from Url and save it in C:\myfolder with the same name as it was on internet

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How to use controls in function used by Thread

When ever we tries to use any control from thread (function used by thread) then we will get following error:
Cross-thread operation not valid: Control 'ControlName' accessed from a thread other than the thread it was created on.

Solution:
For SETTING PROPERTY VALUE for any control below code will help u out from error:
Delegate Sub SetControlValueCallback(ByVal oControl As Control, ByVal propName As String, ByVal propValue As Object)
Private Sub SetControlPropertyValue(ByVal oControl As Control, ByVal propName As String, ByVal propValue As Object)
If oControl.InvokeRequired Then
Dim d As New SetControlValueCallback(AddressOf SetControlPropertyValue)
oControl.Invoke(d, New Object() {oControl, propName, propValue})
Else
Dim t As Type = oControl.[GetType]()
Dim props As PropertyInfo() = t.GetProperties()
For Each p As PropertyInfo In props
If p.Name.ToUpper() = propName.ToUpper() Then
p.SetValue(oControl, propValue, Nothing)
End If
Next
End If
End Sub

call above code as:
to set value in lable:
SetControlPropertyValue(lablel1, "Text", "Hello")
To set value in progressbar:
SetControlPropertyValue(ProgressBar1, "value", i)


For SETTING FUNCTION VALUE for any control below code will help u out from error:
example for listbox:
Private Delegate Sub stringDelegate(ByVal s As String)
Private Sub AddItem(ByVal s As String)
If ListBox1.InvokeRequired Then
Dim sd As New stringDelegate(AddressOf AddItem)
Me.Invoke(sd, New Object() {s})
Else
ListBox1.Items.Add(s)
End If
End Sub

call above code by calling "AddItem()"

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Cross-thread operation not valid: Control 'ListBox1' accessed from a thread other than the thread it was created on

This error comes when you tries to add items in list box (or any other control) in thread (or from the function which is being used by thread).

Below is solution:

Private Delegate Sub stringDelegate(ByVal s As String)
Private Sub AddItem(ByVal s As String)
If ListBox1.InvokeRequired Then
Dim sd As New stringDelegate(AddressOf AddItem)
Me.Invoke(sd, New Object() {s})
Else
ListBox1.Items.Add(s)
End If
End Sub


now just pass your value in "AddItem()" and it will be added in listbox.

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Basic Java Script Examples

lets we have a gridview as shown in pic. now we want have got rates of room and we want to select quantity in dropdownlist and on that basis we want to calculate total in last column of gridview. and then grand total in label below gridview.
then below javascript will help u out:





< script language="javascript" type="text/javascript" >
function ShowTotalPrices(selectbox) {

// var selectedStatus = dropDown.value;
//alert(selectedStatus);
var parentTr = selectbox.parentNode.parentNode;
var secondCellVal = parseInt ( parentTr.cells[4].innerText , 10 );
var comboVal = parseInt ( selectbox.value , 10 );

parentTr.cells[7].innerText = secondCellVal * comboVal;
ManipulateGrid();
}

function ManipulateGrid()
{
var gvDrv = document.getElementById("< %= GridView1.ClientID % >");
var gt=0.0;
for (i=1; i< gvDrv.rows.length; i++)
{
var cell = gvDrv.rows[i].cells;
var valold = cell[7].innerHTML;
var val = 0.0;
if(isNaN(parseFloat(valold)))
{
val= 0.0;
}
else
{
val = parseFloat(valold);
}

gt = parseFloat (gt) + val;
}
document.getElementById("lblgtamount").innerText=gt;
//lbl.Text = gt;
//alert(gt);
}

< /script >



in codding file write below code:
Protected Sub GridView1_RowDataBound(ByVal sender As Object, ByVal e As System.Web.UI.WebControls.GridViewRowEventArgs) Handles GridView1.RowDataBound
If (e.Row.RowType = DataControlRowType.DataRow) Then
Dim ddlroombook As DropDownList = CType(e.Row.FindControl("ddlbookroom"), DropDownList)
Dim availablerooms As Integer = Convert.ToInt32(DataBinder.Eval(e.Row.DataItem, "NumberOfUnits"))
ddlroombook.Attributes.Add("onchange", "javascript:ShowTotalPrices(this);")
Dim i As Integer
For i = 0 To availablerooms
ddlroombook.Items.Add(i)
Next
End If
End Sub

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