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ASP.NET

ASP.NET. Dr. Ralph Westfall May, 2011. Web Development Problem. HTML designed to display static pages only interactive when user clicks links can’t provide animation except How Do I Make An Animated GIF ? can’t create custom pages for specific types of customers

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ASP.NET

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  1. ASP.NET Dr. Ralph Westfall May, 2011

  2. Web Development Problem • HTML designed to display static pages • only interactive when user clicks links • can’t provide animation • except How Do I Make An Animated GIF? • can’t create custom pages for specific types of customers • can’t use databases, spreadsheets, etc. • no security capabilities in HTML itself • except hiding passwords <input type="password" etc. • using very long/random directory/file names works a bit, but it's not HTML

  3. Solution 1: Client Side Scripts • JavaScript (dominant product) can do • animation, rollovers, message boxes • calculations, validation of user inputs • incorporate customized content into pages • e.g. based on day/time, user inputs, etc. • provide limited access to user’s system • system date, browser, plug-in information • set cookies (data for server for next visit)

  4. Client Side Scripts (continued) • what (client side) JavaScript can’t do • write meaningful data to files on the server (other than cookies) • provide adequate security for • access control (but JavaScript Source has some "hackish" scripts) • hiding proprietary code

  5. Solution 2: Server Side Scripts • use common gateway interface (CGI) • offer database & security capabilities • written in C, C++, Perl, Python, etc. • relatively difficult to program & maintain • use server resources relatively inefficiently • separate programs in addition to HTML • but this is probably an advantage

  6. Solution 3: "Classic" ASP • Microsoft's Active Server Pages released in 1996, works with Microsoft servers • Windows Server 2008 • free Visual Web Developer Express 2008 IDE includes a lightweight personal web server for developing ASP.NET applications • so does Visual Studio

  7. Solution 3: ASP (continued) • simple language • can go in same files as HTML code • provides many of the capabilities of CGI • uses server resources more efficiently than CGI • using ASP server extensions, can work with non-Microsoft servers, but …

  8. ASP.NET • major revision of ASP • can use different languages, not just VB.NET • VB.NET code looks more like Java than the VBScript used previously • .NET code is compiled into MSIL (Microsoft Intermediate Language) • MSIL is then interpreted into machine language that runs on the server

  9. ASP.NET: Many Languages • HTML (of course!) • Visual Basic.NET • can also use C# and J# with VWDX • .NET supports over 50 other languages • C++ and JScript (Microsoft's version of JavaScript) work with Visual Studio.NET • other (non Microsoft) languages can also work with Visual Studio.NET

  10. Tools To Develop & Use ASP.NET • a tool to create code • text editors: Notepad, TextPad, etc. • HTML authoring tools: Dreamweaver, FrontPage, etc. • Visual Studio.NET, Visual Web Developer Express 2008, Microsoft WebMatrix (2 free) • IIS or VWDX on your computer • or free (for a while?) ASP.NET hosting • web browser

  11. Simple ASP.NET • create ASP.NET project • Project>Add New Item>Web Form • view Source window and add .NET code to file • between <body> tags put: <% Response.Write("Hello, World!") %> <p>The time is: <% = Now() %></p> • run code from that window

  12. ASP.NET Coding within HTML • use <% at start, %> at end • on same line (inline) • <% = Time %> • or on multiple lines (block) • <% Response.Write("<P>Hello, World!") Response.Write 'cf. Console.Write • %>

  13. ASP.NET Output in HTML • ASP inside a HTML tag • <P>The time is: <% = Time %> • use <% = followed by a variable or a function that returns data, then %> • variable can come from server itself, or from client machine, or can be defined in code elsewhere in same or another ASP file • <% Dim strCar as String="Geo" %> <P>The car is: <% = strCar %>

  14. Generating ASP Output - 2 • ASP.NET code can write text and also data from ASP.NET variables • <% • Dim nAge as Integer = 22 • nAge += 10 • Response.Write("You will be" & nAge) • 'text variable • %>

  15. Generating ASP Output - 3 • can mix text, HTML, and ASP.NET variables in code • this includes using ASP to write HTML tags, in addition to writing variables and text

  16. fontsize.aspx <% Dim intI as Integer For intI = 1 to 7 %> <!-HTML inside ASP loop-> <font size = "<% = intI %>" > Size is <% = intI %> </font><br/> <% Next %> <!--what will you see from this? Notes about " "-->

  17. Using ASP.NET with Forms • use HTML or ASP page to create a form • be sure all form fields have id = "[ ]" and also name = "[ ]" 'same as for id= • use an ASP.NET page to process inputs • action attribute in form has name of an ASP.NET file, and use Input (Submit) button • form field values accessible to ASP as Request.QueryString("[form field name]")

  18. input.html <form method="get" action="output.aspx"> Last Name <input type="text" name="custName" id="custName"> </form> <!--need to refresh?-->

  19. output.aspx • <!-- Visual Studio generated headers--> • <html><body> • Input from form: • <% • Dim strCustName as String strCustName = _ Request.QueryString("custName") • Response.Write("last name is " & _ strCustName)%> </body></html>

  20. Using ASP.NET with Forms - 2 • if have more than just one text field, must have a Submit button on form <input type="submit" [etc.]> • after development would use • <form method="post"[etc.]> • when using post, also need to change every Request.QueryString to Request.Form in the ASP page identified by the action

  21. Another Demonstration • Create: Web Site… ASP.NET Web Site • add a Label to Default.aspx designer and expand it vertically and horizontally to occupy 25% of the screen (could make Height="[]px" and Width="[]px" • double click the screen (outside of the label) to start a Page_Load Sub • paste code on following page into Sub

  22. VB.NET Web Code Dim i As Integer Dim colr() As String = {"000000", "333300", _"666600", "999900", "cccc00", "ffff00"} Dim output As String = "" For i = 0 To 5 output &= "<h1><font color=#" & colr(i) _ & ">" & colr(i) & "</font></h1>" Next Label1.Text = output

  23. Run Code • click Start • (first time) modify the web.config…>OK • view code and then make changes as necessary

  24. CIS 451 ASP.NET • ASP Code Samples

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