ASPNET 35: A Beginner s Guide in .NET

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ASPNET 35: A Beginner s Guide
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Figure 13-7 Alternating shading in rows helps differentiate records
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//Bind to repeater Repeater1DataSource = readBind; Repeater1DataBind(); readBindClose(); hookUpClose(); } }
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Figure 13-7 shows the alternating rows and the very different header You do not want the alternating differences as sharply differentiated as the header The header appears only once, so it does not generate a jarring contrast that repeats itself within the rows of data Experiment with alternating row shading by changing the value of the alternating row color The base color does not need to be white, so you might also want to experiment with different colors for each <ItemTemplate> tag as well
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DataList
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The DataList control is a lot like the Repeater control insofar as binding data is concerned However, using a DataList control is when you need a single-column list For example, suppose you re setting up a networking party with donors to a political campaign Each donor
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will wear a nametag with his or her e-mail address so that the participants can easily exchange e-mail contact The format for each nametag should look like the following: Donor s Name: Mary Smith Email: ms@msmithcom Now everyone can see that the other people are fellow donors and can see their e-mail address for future contact You will find using the DataList control very simple compared with the Repeater in conjunction with HTML tables Because you only have a single column, all of your formatting can be done without worry about multiple columns or any table tags For example, you can format the text within the <ItemTemplate> container pretty much as you would HTML:
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<ItemTemplate> <strong> Field Description:</strong> <%#Eval("FieldName")%> </ItemTemplate>
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Stacked up in a single column, each record needs to be separated Using the <SeparatorTemplate>, you can make sure that the viewer can tell where one record begins and the previous one ends Depending on what you re doing with your data, your separator can just add vertical space or provide instructions For example, with the goal of making nametags, you might want to put in a Cut Here dashed line between records
Try This
Add a DataList
The steps for creating a DataList are pretty simple:
1 Open a new Web Site and save it as DataList 2 In the ASPNET portion of the application, drag a DataList control from the Data
menu of the Toolbox, and place it in the <div> container
3 Once you have the DataList control set up, enter the code in the following listing:
ASPNET DataListaspx
<%@ Page Language="C#" AutoEventWireup="true" CodeFile="DataList aspxcs" Inherits="DataList" %> <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 10 Transitional//EN" "http://wwww3org/TR/xhtml1/DTD/xhtml1-transitionaldtd"> <html xmlns="http://wwww3org/1999/xhtml">
( continued )
ASPNET 35: A Beginner s Guide
<head id="Head1" runat="server"> <title>DataList Control</title> </head> <body> <form id="form1" runat="server"> <div> <asp:DataList ID="DataList1" runat="server"> <ItemTemplate> <strong> Donor's Name:</strong> <%#Eval("FirstName")%>  <%#Eval("LastName") %><br /> <strong>Email:</strong> <%#Eval("Email") %> </ItemTemplate> <SeparatorTemplate> <h6>-----------------------------Cut Here</h6> <p/> </SeparatorTemplate> </asp:DataList> </div> </form> </body> </html>
Once you ve entered the ASPNET portion of the code, open the C# window You can use most of the C# code for the previous two examples making minor but important changes The following shows the complete C# listing:
C# DataListaspxcs
using System; using SystemDataSqlClient; public partial class DataList : SystemWebUIPage { private SqlConnection hookUp; private SqlCommand sqlCmd; private SqlDataReader readBind; protected void Page_Load(object sender, EventArgs e) { hookUp = new SqlConnection("Server=localhost\\SqlExpress; Database=VoteNow;" + "Integrated Security=True"); sqlCmd = new SqlCommand("SELECT FirstName, LastName, Email FROM Supporters", hookUp); hookUpOpen();
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readBind = sqlCmdExecuteReader(); //Bind to repeater DataList1DataSource = readBind; DataList1DataBind(); readBindClose(); hookUpClose(); } }
Data Binding
As you will see, the code for the DataList is much less than for the previous examples You are limited to one column, but within that single column you can format the code any way you want As you can see from Figure 13-8, the records are clearly separated, and when printed on nametag paper, could easily be used for the desired purpose
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