There are 3 ways we can achieve this :
<LinkButton ID="LinkButton1" runat="server" onclick="LinkButton1_Click>LinkButton <asp:LinkButton>
protected override void OnLoad(EventArgs e)
{
LinkButton1.Attributes.Add("onclick", "window.open('test.aspx');");
}
protected void LinkButton1_Click(object sender, EventArgs e)
{
//Server side code here
}
(Problem : Both the events occur simultaneously so if we have a scenario wherein we want the popup to open after the server side code is executed, this isn’t useful)
protected void LinkButton1_Click(object sender, EventArgs e)
{
//Server side code here
Response.Write("<script>");
Response.Write("window.open('test.aspx','_blank')");
Response.Write("</script>");
}
(Problem : In some browsers the CSS of the background window gets affected with this solution)
protected void LinkButton1_Click(object sender, EventArgs e)
{
//Server side code
string _url = "test.aspx";
this.Page.ClientScript.RegisterClientScriptBlock(
this.GetType(),
"openNewWindow", "window.open(\"" + _url + "\");",
true);
}
The 3rd one is the most efficient way in my view.
This was the first message I got after installing google’s new browser Google Chrome . . . :-)
But since then its working like a charm. . . . . Here are some of the features I like the most :
Thumnail view of the ‘Most Visited’ sites when you first open the browser
Opening ‘incognito window’ for private browing (seems similar to IE-8 privacy feature )
‘Inspect Element’ to see the HTML source code of that element along with the DOM
John and Rory have also posted some performance and memory usage benchmarks compared to IE7 here and here.
Recently I got this email from one of my friend which really inspired me and gave a different vision of looking at life . . . . .
Arthur Ashe, the legendary Wimbledon player was dying of AIDS which he got due to infected blood he received during a heart surgery in 1983.
From world over, he received letters from his fans, one of which conveyed: "Why does GOD have to select you for such a bad disease"?
To this Arthur Ashe replied:
"The world over -- 50 million children start playing tennis, 5 million learn to play tennis,
500,000 learn professional tennis, 50,000 come to the circuit, 5000 reach the grand slam,
50 reach Wimbledon, 4 to semi final, 2 to the finals,
when I was holding a cup I never asked GOD 'Why me?'.
And today in pain I should not be asking GOD 'Why me?' "
How to call a JavaScript function from SilverLight ?
The simplest way which I found is by calling the Invoke method of the HtmlWindow class using the HtmlPage object.
As you can see the method take 2 arguments, first being the name of the function and second is the object array for parameters. HtmlPage class is available under System.Windows.Browser namespace.
How to call a SilverLight function from JavaScript ?
Lets take a simple scenario that we need a string trimming functionality on the client side. Since the Silverlight library already has this functionality buildin, we would try to reuse it by exposing a method from Silverlight and calling it from JavaScript.
I have created a separate class for the function to make is easy.
The function which we need to access from the client side should be marked with the [ScriptableMember] attribute.
The next step is to register the scriptable objects when the application is started.
The Application_Startup event can be found in the App.xaml file. The RegisterScriptableObject inturn calls the :
NativeHost.Current.RuntimeHost.RegisterScriptableObject & NativeHost.Current.BrowserService.ReleaseObject methods for the interop.
Now to access this registered object we need to handle the OnPluginLoaded event and get the reference of the entire silverlight control first.
Now we can use the silverLightControl object and access the registered methods like this :
Does this mean that a Silverlight control could access any of your client side code on the hosting page ?
No, we can disable the silverlight to access any of the html/client side content by setting the HtmlAccess property as below:
The default is set to “Enabled”.
Learning is Inevitable !!!
Excellent list of 25 Resources for Tuning Your .NET Application Performance ” :
http://effectize.com/23-resources-tuning-your-net-application-performance
One that I liked the most from the list is -
- Speed Up Your Site! 8 ASP.NET Performance Tips (By Jeff Atwood and Jon Galloway )
It covers many interesting topics like :
Learning is Inevitable . . . .
Scenario
Lets imagine a scenario where we have 2 input boxes and we need to validate that atleast 1 of them should contain some value.
Solution
Asp.net CustomValidator comes handy here. Here is the code which would help us validate this simple scenario:
All works fine except that the validation occurs on the server side. What if we also want this validation from the client side ?
Its simple, create a client side function to validate the same scenario and specify the name of that function in the ‘ClientValidationFunction’ property of the CustomValidator.
<asp:CustomValidator ID="validateAddress" runat="server"
ErrorMessage="Please enter atleast 1 Address"
ClientValidationFunction="validateAtLeastOneAddressHasData"
OnServerValidate="validateAddress_ServerValidate1">
</asp:CustomValidator>
This enables the client side validation but there are still 2 issues with the above code :
1) There is no trimming happening in the client side validation code
2) The client side validation is fired only on the button click event.
For trimming there is a function provided by the asp.net validation scripts named ‘ValidatorTrim’ which is kind of hidden and only available once you start the page. This is how we can use it :
textBox1Value = ValidatorTrim(textBox1Value);
textBox2Value = ValidatorTrim(textBox2Value);
Now for the second issue, ideally the client side validation script should be fired on the onblur() event of any of the textboxes. To do that we would have to hookup the textboxes with the CustomValidator.
Hooking the first textbox is simple. Just specify it in the ControlToValidate property and set the ‘ValidateEmptyText’ property of the CustomValidator to true.
<asp:CustomValidator ID="validateAddress" runat="server"
ErrorMessage="Please enter atleast 1 Address"
ClientValidationFunction="validateAtLeastOneAddressHasData"
OnServerValidate="validateAddress_ServerValidate1"
ControlToValidate="txtAddress1"
ValidateEmptyText="True" >
</asp:CustomValidator>
For hooking the second textbox we would have to use a startup script function 'ValidatorHookupControlID as below :
<script type="text/javascript">
ValidatorHookupControlID ( '<% = txtAddress2.ClientID %>',
document.getElementById('<% =validateAddress.ClientID %>')
);
</script>
Recently I came across this brief but excellent whitepaper written by Kent Back on Tools of Agility.
I found these two diagrams from the whitepaper very interesting as they clearly explain,
- how the process flow differs in agile practise
- how the different tools are interwoven and support the agile practice
Waterfall
Agile
Tools to support Agility
Learning is Inevitable ! ! !
While working on some refactorings in my recent project I came across a piece of what I would like to call ‘ignorant code’*.
I have tried to get the gist of the scenario with the below diagram :
Its a pretty basic scenario where we have multiple web controls clubbed together in a single control. (Although I not a huge fan of nested web controls)
What’s important to consider here is the use of Page_Load and OnPreRender events in the Parent and Child web controls.
Probably we all know that Page_Load always occurs before the OnPreRender but the OnPreRender only occurs if the ‘Visible’ property of the web control is set to true.
So in the above scenario although the controls were made visible according to the page, the Page_Load event of all the 7 sub web controls was called everytime. The solution to this is to simply move the hefty code from Page_Load to the OnPreRender event. As the rendering would only occur if the control is visible it would only execute the hefty code on the relevant pages.
*ignorant Code : No code is crap code or bad code its just that we do not know a better way to do it at that point of time
Have a look at the below code :
Here we are using the Explicit interface member implementation to differentiate the methods.
Now if we try to access these methods from an instance variable. . .
We can’t !!! Because there is no access modifier specified in the implementation and hence the methods are treated as ‘private’.
So we try specifying the ‘public’ access modifier for these methods but that too generates a compiler error in visual studio !!!
So then how do we actually use any of those methods . . . .
So what’s confusing here is that although the methods were private they are behaving like public.
Finally I managed to find the answer to this behaviour. . . .
Here is a good explanation of this and how the IL code for implicit & explicit Interface Contracts.
Click: Start -> RunThis will open the real GAC folder where the files are saved. Now go 1 level up :
Type: %systemroot%\assembly\gac [ENTER]
While reading the Architecture Journal I came across this excellent list of skills from A-Z which really depicts that architecture is as much about softer skills—good judgment, balance, and other wisdom—as it is about understanding the broad technical landscape, or the skills required to design and implement an architecture.
I have compiled this table to stick it on my desk This would constantly remind me 'where I can imporve myself' . . .
Microsoft released a Source Analysis tool for C# last friday. It is released under Ms-PL License and can be found at MSDN Code Gallery (Source Analysis 4.2)
Source Analysis covers around 200 best practises and rules around code formatting including line spacing, placement of brackets, file and method headers for documentation and many more. This blog covers more details and future plans for this tool.
One of the rule which draw my interest and made me 'google' around is the 'using' directive ordering rule:
I haven't heard many people recommending this as a good practise and hence I started searching around, trying to find when this rule could be useful.
On my search I came across this interesting blog post by Eric Lippert. The comments in this post also has couple of scenarious when this could be used.
