Answers for Day 4

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	Sams Teach Yourself ASP.NET in 21 Days, Second Edition By Chris Payne
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	Appendix A. Answers to Quiz Questions

Quiz

1:	What are static members?
A1:	Static members are members of an object that don't belong to any specific instance of the object, such as a counter. These can be accessed by the following: Object.member
2:	Will the following code snippet work? <html><body> Hi there! <% Response.Redirect("page2.aspx") %> </body></html>
A1:	No. `Response.Redirect` must be called before any output is sent to the browser.
3:	What language is the following code snippet written in? Response.Write("Hello there!")
A1:	Response.Write("Hello there!") This is VB.NET. Often the only giveaway between the languages is the semicolon at the end of the statement.

Exercises

1:	Create an ASP.NET page in C# that acts as a secure login page. Allow the user to enter a username and password in a text box. If they match a string you specify, redirect the user to a "success" page. Otherwise, display an error. If the user is valid, save her username in a `Session` variable.
A1:	The code for `example1.aspx` is as follows: 1: <%@ Page Language="C#" %> 2: 3: <script runat="server"> 4: void Submit_Click(Object Sender, EventArgs e) { 5: if (tbPass.Value == "mypass") { 6: Session["UserName"] = tbUser.Value; 7: Response.Redirect("exercise2.aspx"); 8: } else { 9: Label1.Text = "<font color=red>That " + 10: "is the wrong password!</font>"; 11: } 12: } 13: </script> 14: 15: <html><body> 16: <form runat="server"> 17: 18: Please enter your username and password:<p> 19: <input type="text" 20: runat="server"/><br> 21: <input type="password" 22: runat="server"/> 23: 24: <p> 25: <asp:Button 26: text="Submit" 27: runat="server" 28: OnClick="Submit_Click" /><p> 29: 30: <asp:Label runat="server"/> 31: </form> 32: </body></html>
2:	Write the success page in VB.NET. Display a personalized Welcome message using the `Load` event of the `Page` object and a `Label` control. Also inform the user of the current time and his `Session` ID. Check the `IsPostback` property of the `Page` object to ensure that this message is only displayed the first time he arrives at the page. Provide a button for him to log out, with a confirmation message.
A1:	The source for `exercise2.aspx` is as follows: 1: <%@ Page Language="VB" %> 2: 3: <script runat="server"> 4: sub Page_Load(Sender as Object, e as EventArgs) 5: if not Page.IsPostBack then 6: Label1.Text = "Welcome " & Session("Username") & _ 7: "!<p>" 8: 9: Label1.Text = Label1.Text & "The current time " & _ 10: "is: " & DateTime.Now.ToString("T") & "<p>" 11: 12: Label1.Text = Label1.Text & "Your session id " & _ 13: "is: " & Session.SessionID & "<p>" 14: end if 15: end sub 16: 17: sub Submit_Click(Sender as Object, e as EventArgs) 18: Session.Abandon 19: Label1.Text = "Your session has ended." 20: btSubmit.Visible = false 21: end sub 22: </script> 23: 24: <html><body> 25: <form runat="server"> 26: <asp:Label runat="server"/> 27: 28: <asp:Button 29: text="Submit" 30: runat="server" 31: OnClick="Submit_Click" /><p> 32: </form> 33: </body></html>


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Sams Teach Yourself ASP. NET in 21 Days

Sams Teach Yourself ASP.NET in 21 Days (2nd Edition)

ISBN: 0672324458
EAN: 2147483647

Year: 2003
Pages: 307

Authors: Chris Payne

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