Presenting Tabular Data in a Grid in Visual Studio .NET

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Presenting Tabular Data in a Grid
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As a simple example, assume you want to present a table of customers on a page, with the ability to select a customer from the list When the customer is selected, the customer's company name is to be displayed at the top of the page The code to accomplish this is shown in Listings A1 and A2 The running application is shown in Figure A1 (with some autoformatting changes applied so that you can see what is going on)
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Figure A1 Simple Data-Bound ASPNET 11 Application
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Listing A1 Defaultaspx Markup
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<%@ Page language="c#" Codebehind="Defaultaspxcs" AutoEventWireup="false" Inherits="Simple10DataBinding_Default" %> <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 40 Transitional//EN" > <HTML> <HEAD> <title>Simple Data Binding Example</title> </HEAD> <body MS_POSITIONING="FlowLayout"> <form id="Form1" method="post" runat="server"> <asp:Label id="m_SelectedCustomerPromptLabel" runat="server">Selected Customer:</asp:Label> <asp:Label id="m_SelectedCustomerLabel" runat="server" />
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<asp:DataGrid id="m_CustomersGrid" runat="server"> <Columns> <asp:ButtonColumn Text="Select" CommandName="Select" /> </Columns> </asp:DataGrid> </form> </body> </HTML>
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An ASPNET Web form always contains HTML that marks the HEAD and body elements, which are part of the HTML standard for a Web page Each Web form should contain a single form element that contains all of the ASPNET-specific markup Within the form element, other markup tags define the controls that the page is composed of, along with attributes or child elements for those tags that drive their behavior when rendered to the browser Intermixed with the markup tags can be any amount of inline script in several different forms of script blocks In the code in Listing A1, you can see that three ASPNET controls are declaredtwoLabels and a DataGrid Each tag is prefixed byasp:, which scopes the tag name to the namespace in which Web server controls are defined They also each have an id attribute and a runat="server" attribute The id is used to map the tag to a server control instance at runtime, and the runat attribute identifies the control as a server control that will have an instance created and called while the page is being processed on the server Complex controls like the DataGrid have an intricate schema of allowable child attributes and elements that can be used to customize their runtime rendering behavior Any properties that are exposed on the control class as public or private can also be set to values in the markup by specifying those properties as attributes on the control's markup tag In the DataGrid in Listing A1, a single column control of type ButtonColumn is specified as a child element in the Columns collection Additional columns will be dynamically added in this sample when the grid is data bound
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After you have specified the layout of the page through the ASPX markup file, you then hook up the dynamic behavior of the page through a codebehind file, as shown in Listing A2
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Listing A2 Defaultaspxcs Code-Behind
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public class _Default : SystemWebUIPage { protected Label m_SelectedCustomerPromptLabel; protected Label m_SelectedCustomerLabel; protected NorthwindDataSet m_CustomersDataSet; protected DataGrid m_CustomersGrid; private void Page_Load(object sender, EventArgs e) { if (!IsPostBack) { NorthwindDataAccess dac = new NorthwindDataAccess(); m_CustomersDataSet = dacGetCustomers();
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m_CustomersGridDataSource = m_CustomersDataSet; m_CustomersGridDataMember = "Customers"; DataBind(); } } private void OnSelectedIndexChanged(object sender, EventArgs e) { int rowNumber = m_CustomersGridSelectedIndex; string customerName = m_CustomersGridSelectedItemCells[2]Text; m_SelectedCustomerLabelText = customerName; } }
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The code in Listing A2 shows the code-behind for the sample, and it is typical of a simple ASPNET 11 Web form Any server controls that are defined in the markup of the ASPX file are also included as member variables in the code-behind class The ASPNET runtime will associate the control created at runtime based on the markup with these member variables by matching the member variable name with the control tag ID in the ASPX file The member variables of the code-behind class can then be used to programmatically access and modify those controls while the page is processing You can see one additional member here that wasn't visible in the page markup for a NorthwindDataSet typed data set This was added by dragging a DataSet item from the Toolbox onto the page in the designer, but because it has no visible rendering of its own, it doesn't add anything to the markup, just the code-behind Most ASPNET pages will do a lot of their processing in their PageLoad event handler, which is namedPage_Load by default in Visual Studio This is often the place that you will go to retrieve any data that is needed by the page for rendering, and you will often store that data in member variables so that it is available for other methods in the page that are called while the page is being processed Keep in mind that a new instance of the page is created for each request that comes in, so the member variables are only in scope for as long as a single request is processing Additionally, you may have any number of helper methods to factor out the code that initializes page controls and members, and you may have any number of event handlers for events that are raised by controls on the page on postback You will typically do the first rendering initialization of page controls in the Page_Load event handler, and will then do most of the postback processing in the event handlers for the controls on the page, although you can also do a lot of work in Page_Load on postback if it makes sense for your scenario In the code in Listing A2, the Page_Load event handler retrieves the customer data into a member instance of theNorthwindDataSet typed data set using a data access helper class that is part of the project This kind of call will typically call out to a data access layer or business layer in realworld applications After the page code gets the data into the member variable, it uses that data set to set the DataSource property on the DataGrid control and sets the DataMember to "Customers" to indicate that it is the Customers table within the data set that is the real tabular data source for the grid This should all look very similar to what you normally do in a Windows Form Finally, it calls DataBind, which is always required in ASPNET 1X, and is still required in ASPNET 20 when you programmatically set the DataSource property All of this code is wrapped in a check for the page's IsPostBack property, which means that it will only be executed when the page is initially rendered, and it won't be re-executed on postbacks
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