I came across this article that will most certainly help out beginners of ASP .NET programming.
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 tag to the following location within your Web.config file:
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: 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:\WINDOWS\Microsoft.NET\Framework\<>\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
I basically copied the stuff from http://www.codersource.net/asp_net_simple_tips.html for my own reference and for others.
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
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.
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!
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();
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 = "";
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.
Here's the default location:
C:\WINDOWS\Microsoft.NET\Framework\<
Windows Server 2003, you must use aspnet_regiis -i -enable. This is because of the "Web Service Extensions" feature in IIS 6
