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4.2. Building CRUD Operations in an ASP.NET Web Page
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You want to build an ASP.NET page that allows inserting, updating, deleting, and reading from your model.
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Let s say you have an application that manages the membership in a local club. You have a model like the one in Figure 4-3.
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Figure 4-3. A model with a Member entity that contains a member s name and email address The model contains a Member entity. You want to create a simple ASP.NET page shows all the club members and allows the user to create a new member, update an existing member, and delete a member. There are lots of ways to do this, but you want to use an EntityDataSource control to do as much of the work declaratively as possible. To create this page, we ll need three basic parts. First, we ll need a way to show all the club members. We ll use a ListView to do this. Next, we ll need a way to populate the ListView will the club member. We ll use an EntityDataSource for this. Finally, our club may grow large enough that we can t reasonably display all the members on a single web page. We will need a way to break up the display into multiple pages. We ll use a DataPager control to do this. The code for the ASP.NET page is shown in Listing 4-3. We ll also need some code behind to handle a few events. The code behind is shown in Listing 4-4. Listing 4-3. The ASP.NET page with the three core parts: ListView, EntityDataSource, and DataPager <body> <form id="form1" runat="server"> <div style="font-size:larger; margin: 10px;">Manage Club Members</div> <div> <asp:Button ID="Insert" Text="Insert New Member" runat="server" OnClick="InsertMember" /> <asp:ListView ID="membersList" runat="server" DataSourceID="membersDataSource" DataKeyNames="MemberId" OnItemInserted="membersList_ItemInserted"> <LayoutTemplate> <table> <tr>
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<th colspan="2"> </th> <th>Name</th> <th>Email</th> </tr> <tr id="itemPlaceholder" runat="server" /> </table> </LayoutTemplate> <ItemTemplate> <tr> <td><asp:LinkButton Text="Delete" CommandName="Delete" runat="server" /></td> <td><asp:LinkButton Text="Edit" CommandName="Edit" runat="server" /></td> <td><%# Eval("Name") %></td> <td><%# Eval("Email") %></td> </tr> </ItemTemplate> <InsertItemTemplate> <tr> <td colspan="4"> <table> <tr> <td>Name:</td> <td><asp:TextBox ID="Name" runat="server" Text='<%# Bind("Name") %>' /></td> </tr> <tr> <td>Email:</td> <td><asp:TextBox ID="Email" runat="server" Text='<%# Bind("Email") %>' /></td> </tr> <tr> <td colspan="2"> <asp:Button Text="Insert" CommandName="Insert" runat="server" />  <asp:Button Text="Cancel" CommandName="Cancel" OnClick="CancelClick" runat="server" /> </td> </tr> </table> </td> </tr> </InsertItemTemplate> <EditItemTemplate> <tr> <td colspan="4"> <table> <tr> <td>Name:</td> <td><asp:TextBox ID="Name" runat="server" Text='<%# Bind("Name") %>' /></td>
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</tr> <tr> <td>Email:</td> <td><asp:TextBox ID="Email" runat="server" Text='<%# Bind("Email") %>' /></td> </tr> <tr> <td colspan="2"> <asp:Button Text="Update" CommandName="Update" runat="server" />   <asp:Button Text="Cancel" CommandName="Cancel" runat="server" /> </td> </tr> </table> </td> </tr> </EditItemTemplate> </asp:ListView> <asp:EntityDataSource ID="membersDataSource" runat="server" ConnectionString="name=EFRecipesEntities" DefaultContainerName="EFRecipesEntities" EnableInsert="true" EnableUpdate="true" EnableDelete="true" EntitySetName="Members" /> <asp:DataPager ID="Pager" runat="server" PagedControlID="membersList" PageSize="2"> <Fields> <asp:NumericPagerField ButtonCount="10" /> </Fields> </asp:DataPager> </div> </form> </body> Listing 4-4. The code behind that handles the events for our ASP.NET page public partial class Default : System.Web.UI.Page { protected void Page_Load(object sender, EventArgs e) { if (!Page.IsPostBack) { using (var context = new EFRecipesEntities()) { context.ExecuteStoreCommand("delete from chapter4.Member"); context.Members.AddObject(new Member { Name = "Robert Dewey", Email = "RobertD@gmail.com" }); context.Members.AddObject(new Member { Name = "Nancy Steward", Email = "NSteward@AOL.com" }); context.Members.AddObject(new Member { Name = "Robin Rosen",
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Email = "RRosen@Regenix.com" }); context.SaveChanges(); } } } protected void membersList_ItemInserted(object sender, ListViewInsertedEventArgs e) { if (e.Exception == null) { membersList.InsertItemPosition = InsertItemPosition.None; } } protected void CancelClick(object sender, EventArgs e) { membersList.InsertItemPosition = InsertItemPosition.None; } protected void InsertMember(object sender, EventArgs e) { membersList.InsertItemPosition = InsertItemPosition.FirstItem; } } The page in Listing 4-3 and the code in Listing 4-4 displays a page that lists the club members, along with buttons for inserting new members as well as editing and deleting current members. The listing page is shown in Figure 4-4. The insert page is shown in Figure 4-5. The edit page is shown in Figure 4-6.
Figure 4-4. The listing of the club members. The data pager at the bottom allows the user to move forward and backward through the pages containing members.
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