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Figure 11-34. Default.aspx in design mode The web form consists of two more login-related controls at the top: UserName and LoginStatus. The former control displays the user name of the logged-in control on the form, whereas the latter displays the login status of the user (logged in or not logged in). Below the UserName and LoginStatus controls there is a label that will display the roles to which the user belongs. Finally, there is a set of text boxes for capturing all the profile properties. Clicking the Save button will save the profile information. The Page_Load event handler of Default.aspx is shown in Listing 11-26. Listing 11-26. Displaying Information About User Roles protected void Page_Load(object sender, EventArgs e) { string[] roles=Roles.GetRolesForUser(); Label2.Text = "Your are registered as " + string.Join(",", roles); if (!IsPostBack) { GetProfile(); } } The code retrieves all the roles to which the current user belongs by using the GetRolesForUser() method of the Roles object. Roles is a built-in object implicitly available to all ASP.NET applications. The GetRolesForUser() method returns all the roles as a string array. The roles names are joined together by using the Join() method of the string class and then displayed in a Label control. Next, the code checks the IsPostBack property of the web form. The IsPostBack property tells you whether you are in the Page_Load event handler because of a fresh request or because of some post-back operation. If the user is visiting the page as a fresh request, the GetProfile() helper method is called. The GetProfile() method retrieves the profile properties of the user and displays them in the respective text boxes. This method is discussed shortly.

Note By default, the crontab command uses the nano editor to do its work. The problem with nano,

Figure 2-9. The sprites now move and collide. To change your clsSprite code to support collisions between two circle sprites, create two new read-only properties, center and radius, which are calculated according to the other sprite properties. public Vector2 center{ get{ return position + (size/2);} } // Sprite center public float radius { get { return size.X / 2; } } // Sprite radius Next, create a new method for testing this specific type of collision: public bool CircleCollides(clsSprite otherSprite) { // Check if two circle sprites collided return (Vector2.Distance(this.center, otherSprite.center) < this.radius + otherSprite.radius); } Finally, change the Update method of the Game1 class to call CircleCollides instead of Collides. You ll see that the circles will now bounce only when they actually collide.

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however, is that it doesn t write its configuration files to the right location by default. To fix this, as root add the following line to the end of /etc/profile: export VISUAL=vim. After logging in again, vim will be used as the default editor for crontab and some other editor-related commands as well. The advantage The right file will be created at the right location automatically.

The Click event handler of the Save button is shown in Listing 11-27. Listing 11-27. Saving Profile Values protected void Button1_Click(object sender, EventArgs e) { SetProfile(); } This simply calls a helper method SetProfile() that sets the profile properties as per the values entered in various text boxes. The GetProfile() and SetProfile() helper methods are shown in Listing 11-28. Listing 11-28. Saving and Retrieving Profile Properties private void SetProfile() { Profile.FullName = TextBox1.Text; Profile.DOB = DateTime.Parse(TextBox2.Text); Profile.Address.Street = TextBox3.Text; Profile.Address.State = TextBox4.Text; Profile.Address.Country = TextBox5.Text; Profile.Address.PostalCode = TextBox6.Text; } private void GetProfile() { if (Profile.FullName != "") { TextBox1.Text = Profile.FullName; TextBox2.Text = Profile.DOB.ToShortDateString(); TextBox3.Text = Profile.Address.Street; TextBox4.Text = Profile.Address.State; TextBox5.Text = Profile.Address.Country; TextBox6.Text = Profile.Address.PostalCode; } } The SetProfile() method uses the Profile object to assign profile property values. Just like the Roles object, the Profile object is a built-in object accessible to all web applications. Notice how the profile properties defined in the web.config file appear as properties of the Profile object. Also, note that the DOB property is of type DateTime and hence type conversion is necessary. The profile properties from the group (Address) can be accessed by using the familiar nested property notation. The GetProfile() method retrieves profile property values and assigns them back to the text boxes.

If you search for XNA in any common Internet search engine, you ll get (as of February 2009) around four million hits. When you narrow down the search to XNA Tutorial, you ll get about half a million results, without quotation marks, and about thirty thousand results with them. So, forget about searching the Internet for your next steps, unless you know exactly what you need! Riemer Grootjans presents a variety of XNA tutorials that may help you go a step further in exploring new XNA horizons at his site (http://www.riemers.net). We also recommend Riemer s excellent XNA 3.0 Game Programming Recipes book (Apress, 2009).

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