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Top > ASP.NET > Tips and Tutorials
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know I promised that I wouldn't go into them, but one of my favorite uses of this type of thing is to tell human visitors to your web site apart from computer visitors (spiders). By generating an image with a text message, you can ask visitors to type in the text to verify that they're not a computer. Granted there are computer programs (OCR or optical character recognition programs) that can do this type of thing, but they're relatively complex to write and are pretty easily fooled by picking weird fonts or distorting the images slightly. Most of the bigger web service providers like those that provision free email accounts or free web space have already implemented something like this. For more info, check out the CAPTCHA Project. The 8 page technical report available from the site's home page makes for an interesting read if you're interested in the topic.
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Date Added: Oct 10, 2006 Hits: 3 Rating: 0.00 Votes: 0
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Before embarking on the inevitable?and not painless?migration to ASP+, it's best to know what compatibility issues you'll have to deal with
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Apparently some developers worry about what their sites look like and as a result they actually work with a graphic designer or layout artist (I'm not up on the politically correct title) to get it looking spiffy... who knew! ;) This is where code-behind really is a godsend. You just send the graphics person the Web Form portion of your page and they work with that. They never get to see (or mess with and break) the code that you've spent days working to get just right
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Visual Basic .NET has not only extended the versatility of the Visual Basic language but also harnessed the power of the .NET framework, the new "Delegate" feature is one of them. So now you don't get the sneer of the self proclaimed C++ or Java programmers looking down on VB programmers as mere mortals!
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This article discusses different options you as a developer have in ASP.NET to send data from one ASP.NET page to another. Since you cannot use ASP.NET Web Controls (System.Web.UI.WebControls) in such a scenario (which only allow posting back of data to the same page), this article discusses other ways like using HttpContext object
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In this article we will take a quick look at two methods for creating SHA1 passwords for use on the web.
In brief we show how to generate SHA1 hashes that are Forms Authentication compatible via
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In brief we show how to generate SHA1 hashes that are Forms Authentication compatible via
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In the previous tutorial (Accessing MySQL Database with ASP.NET), we learned how to obtain, install, configure and run MySQL on Windows. Later we learned how to create new tables and display records using ASP.NET DataGrid control.
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In this step by step tutorial we will learn how to obtain, install, configure and run MySQL database on Windows. We will then move on to create a table in MySQL database, populate this table with some records and then display those records in the browser using an ASP.NET page
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This is a simple RD4 encryption stored procedure. It beats using a cast as varbinary!
This is a simple RD4 encryption stored procedure. It's nice because it uses the same procedure to encrypt and decrypt and it beats using a cast as varbinary!
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This is a simple RD4 encryption stored procedure. It's nice because it uses the same procedure to encrypt and decrypt and it beats using a cast as varbinary!
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In this article we will learn how to determine the size and dimensions ( width & height ) of an uploaded image? allow the image to be uploaded if it is less than given size? or if it's width and height are less than
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