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n 4, you learned about basic web controls for displaying graphics, such as the Image and ImageButton controls. Both allow you to display an image, and the ImageButton control also fires a Click event that gives you the exact mouse coordinates. But in a modern web application, you ll often want much more. In this chapter, you ll learn about two .NET innovations that give you greater control over the look and feel of your website. First, you ll learn about the ImageMap control, which allows you to define invisible shaped regions over an image and react when they re clicked. Next you ll tackle GDI+, a .NET model for rendering dynamic graphics. You ll learn how to render custom graphics with GDI+, how to embed these graphics in a web page, and how to create custom controls that use GDI+.

As the provider WebPart will be the previously created CustomerNotesPart, you need to modify this one so it implements the INotesContract communication contract interface and contains a public method with the <ConnectionProvider> attribute. Basically, the code is as follows: Public Class CustomerNotesPart Inherits WebPart Implements IWebEditable, INotesContract #Region "INotesContract Members" Public Property Notes() As String Get ' Get the NoteContent value from the grid's data source ' ... End Get Set ' Update value to the grid's data source ' ... End Set End Property Public ReadOnly Property SubmittedDate() As DateTime Get ' Get the NoteDate value from the grid's data source

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To create an ASP.NET application, you need two high-level areas of functionality: The compiler, which inspects the developer code and translates it into lower-level code (in this case, IL) The IDE, which allows a developer to write code .NET separates these two pieces. That way, every language can use the same design tools.

Almost all of the techniques discussed in this chapter are equally well supported in ASP.NET 1.x. The key addition is the ImageMap control, which provides a server control wrapper for the <map> and <area> tags.

' ... End Get End Property #End Region ' Rest of the implementation ... Within the property procedures, you need to add the appropriate code for retrieving the values from the data source you have bound to the GridView in the WebPart s original version. Updating the data in the property s set procedure means updating the value in the GridView s data source and then using, for example, a SqlCommand or a SqlDataAdapter for updating the values on the database. Retrieving the SubmittedDate from the GridView s data source might look like this: Public ReadOnly Property SubmittedDate() As DateTime Get EnsureChildControls() If CustomerNotesGrid.SelectedIndex >= 0 Then Dim RowIndex As Integer = CustomerNotesGrid.SelectedRow.DataItemIndex Dim dt As DataTable = CType(CustomerNotesGrid.DataSource, DataTable) Return CDate(dt.Rows(RowIndex)("NoteDate")) Else Return DateTime.MinValue End If End Get End Property You can verify whether an item has been selected in the GridView. (To do this, you need to enable selection on the GridView.) If an item is selected, you retrieve the DataItemIndex, which then can be used as an index for accessing the DataRow of the DataTable, which is bound to the GridView. You can read the value from the DataRow and return it. The next thing your provider WebPart has to support is a method marked with the <ConnectionProvider> attribute. This method returns the actual implementation of the communication contract interface, which is the WebPart in this case. Therefore, you need to implement it as follows: <ConnectionProvider("Notes Text")> _ Public Function GetNotesCommunicationPoint() As INotesContract Return CType(Me, INotesContract) End Function That s it! Your provider WebPart is ready to use. Next you need to implement the consumer WebPart, which is much easier.

The .NET language compilers include the following: The Visual Basic compiler (vbc.exe) The C# compiler (csc.exe) The JScript compiler (jsc.exe) The J# compiler (vjc.exe)

Web pages commonly include complex graphics, where different actions are taken depending on what part of the graphic is clicked. ASP.NET developers can use several tricks to implement this design: Stacked image controls: Multiple borderless pictures will look like one graphic when carefully positioned next to each other. You can then handle the clicks of each control separately. This approach works well for buttons and navigational controls that have defined, rectangular edges. ImageButton: When an ImageButton control is clicked, it provides the coordinates where the click was made. You can examine these coordinates in your server-side code and determine what region was clicked programmatically. This technique is flexible but tedious and errorprone to code. ImageMap: With the ImageMap control, you can define separate regions and give each one a unique name. One advantage of this approach is that as the user moves the mouse pointer over the image, it changes to a hand only when the user is positioned over a defined region. Thus, this approach works particularly well for detailed images that have small hotspots. The ImageMap control is new in ASP.NET 2.0. It provides a server-side abstraction over the HTML <map> and <area> tags, which define an image map. The ImageMap control renders itself as

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