ASP .Net Tips

February 2, 2010 muthu Asp .Net Articles 0

I’m Going to explain now on some Control tip and tricks which
will help and increase the speed of the webpages.

1.Smart navigation

Smart navigation is a little-known Internet Explorer feature that enables the
individual controls on your Web forms to maintain focus between postback, as
well as allows you to suppress that flicker that occurs as you load the new
page.
To turn on this little-known feature, simply set the smartNavigation property of
your ASPX page to True. You can also apply the property to all project pages, by
adding the <pages> tag to the following location within your Web.config file:

<configuration>
 <system.web>
 <pages smartNavigation="true"/>
 </system.web>
 </configuration>

Note that smart navigation works on only Internet Explorer 5 and above; however,
ASP.NET will automatically detect this and serve up the ?smart? code only if the
target browser supports it.

Also, I?d personally advise that you test it against any third-party menu
controls or scripts you may have running: it is prone to falling over on
particularly advanced pages.

2.Stopping Your User from Right-Clicking

Want to prevent your user from performing any of the other commands available by
right-clicking on a Web page in Internet Explorer? It?s not foolproof, but this
neat little HTML edit usually does the trick.

Just alter the opening <body> tag of your HTML to the following:

    <BODY oncontextmenu="return false">

When the menu is requested, the oncontextmenu event runs, and we instantly
cancel it using JavaScript. This is especially potent as a method for stopping
the user from viewing your source, when used in conjunction with a menu-less
browser window. Great stuff!

3.Creating Images Dynamically

Ask any ASP developer who has ever tried to dynamically create his own images
and he?ll tell you it?s a nightmare. In fact, it?s more than a nightmare. It?s
practically hell. The only true solution? Reverting to an expensive, dodgy,
third-party control to do the work for you.

With ASP.NET, however, you can develop your own dynamic images with ease. Simply
create an image object and use the new GDI+ features to add objects to that
image, such as text, rectangles, and ellipses. After that, you can simply stream
straight back down to the client.

But covering the graphics features in depth would require at least another two
books, and, unfortunately, we don?t have that much room. So, I?m going to share
a sample that demonstrates creating a small ?Drawing? button,
alongside a little blue-and-yellow bullet point.It?s the sort
of personalized graphic you?ll find on sites such as Amazon.com.

Here?s the code:

Bitmap objBitmap = new Bitmap(120, 30);
 Graphics objGraphics = Graphics.FromImage(objBitmap);
 objGraphics.FillRectangle(new SolidBrush(Color.LightBlue), 0, 0, 120, 30);
 objGraphics.FillEllipse(new SolidBrush(Color.Blue), 3, 9, 10, 10);
 objGraphics.FillEllipse(new SolidBrush(Color.Yellow), 4, 10, 8, 8);
 objGraphics.DrawString("Drawing", new Font("Tahoma", 8), new
 SolidBrush(Color.Green), 16, 8);
 Response.Clear();
 Response.ContentType = "image/jpeg";
 objBitmap.Save(Response.OutputStream, System.Drawing.Imaging.ImageFormat.Jpeg);
objGraphics.Dispose();
objBitmap.Dispose();

You can put it inside any event you want.

4.Clear All The Textbox Values (Reset Function)

In Classic ASP, to clear all the textboxes in a form, to start over, we just had
to use a simple html ‘Reset’ button in the form. Sometimes that works in
ASP.Net;sometimes it doesn’t.

Here are a couple of ways to do this, iterating through the ASP.Net TextBox
controls in a form —
Just create a Reset type subroutine – in that routine, use the following code:
in C# – it would be:

Control myForm = Page.FindControl("Form1");
 foreach (Control ctl in myForm.Controls)
 if(ctl.GetType().ToString().Equals("System.Web.UI.WebControls.TextBox"))
 ((TextBox)ctl).Text = "";

This will clear EVERYTHING from the textboxes – even if you had them
pre-populated with data. A VERY simple way to just reset it to the condition at
Page_Load time, just do this in the Reset SubRoutine:

    Server.Transfer(“YourPageName.aspx”)

5.Pressing Enter  key

Sometimes, you will notice, that, in an ASP.Net form, depending on
the circumstances, pressing the ‘Enter’ key to submit the form does not work.

To force this to happen for a particular button on your page, just put this in
the Page_Load routine:

Page.RegisterHiddenField("__EVENTTARGET", "button1")

Then, change ‘button1’ to the ID of your particular button. Understand, of
course, if your cursor is inside of a MultiLine textbox, the default action of
the enter key is to create a new line in the textbox, so, if this basically
works anywhere outside of that scenario.

6.ASP.Net Server Controls Not Showing on pages

It’s possible that ASP.Net is not registered correctly on your system.Try running aspnet_regiis from the command prompt.

Here’s the default location:

 C:WINNTMicrosoft.NETFramework<<ASP.Net Version#>>aspnet_regiis.exe -i

Windows Server 2003, you must use aspnet_regiis -i -enable. This is because of the “Web Service Extensions” feature in IIS 6

7.Where To Store Database Connection

Let’s say you have a database connection (or several) that you will be using
over and over. Yes, you can manually copy/type it in on every ASP.Net page – BUT
– an easier way is to store it in the Web.Config file (formerly config.web) and
then refer to it in the code.

In Web.Config, you would add a key to the AppSettings Section:

 <appSettings>
 <add key="MyDBConnection" value="server=YourServer;uid=Username;pwd=Password;database=DBName"
 />
 </appSettings>

for OleDb – use Absolute Path – Not Server.MapPath:

<add key="NWOleDB" value= "Provider=Microsoft.Jet.OLEDB.4.0;Data Source=C:Inetpubwwwrootdatanorthwind.mdb;" />

Then, in your ASP.Net application – just refer to it like this:

SqlConnection myConnection = new
 SqlConnection(ConfigurationSettings.AppSettings("MyDBConnection"));