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The general structure of EditCustomers.aspx is an HTML table, with two columns. The left column contains the field names, and the right column contains the controls that allow the fields to be entered and edited. Each of the fields, except the State drop-down list, is hooked up to a RequiredFieldValidator control. RequiredFieldValidator, as you recall, is one of the simpler validator controls. The only attributes set for most of the RequiredFieldValidator controls are ControlToValidate, each set to a different control, and ErrorMessage, in this case, an asterisk. Some of the RequiredFieldValidator controls for example the control associated with the ContractEnds text box also have the Display attribute set to Dynamic. Recall from 5 that validators not set to Display=Dynamic take up space even when they re not being fired. When you have multiple validators on a single control, having those validators set to Display=Dynamic indicates that validators that aren t signaled won t take up space, meaning that when you have two validators on a field, no matter which one is signaled, the error message will begin at the same location. Several of the controls have RegularExpressionValidator controls associated with them. For example, the PostalCode text box uses the following RegularExpressionValidator declaration: <asp:RegularExpressionValidator id=RegularExpressionValidator1 runat="server" ControlToValidate="PostalCode" ErrorMessage="*" ValidationExpression="\d{5}(-\d{4}) "> </asp:RegularExpressionValidator>
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The ValidationExpression attribute indicates that there must be five digits, optionally followed by a hyphen and four other digits. There s also a RegularExpressionValidator control associated with the ContactEmail field, and that ValidationExpression attribute is even more complex. Again, the MSDN documentation covers the regular expression syntax fairly completely.
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Why Doesn t EditCustomers.aspx Use Data Binding In Listing 9-6, you ll see a number of text box controls, including the CompanyName text box control, shown here: <asp:TextBox id=CompanyName runat="server" MaxLength="50" Width="250px" ></asp:TextBox> What seems to be missing is any code to bind data to the controls. This isn t an accident, and ends up being an interesting design decision. When I first began this page, I did use data binding to set the text value for the control. This approach worked, but it left me with a couple of problems, some obvious, some less so. First, having the binding taking place declaratively places details of how the data is bound in the .aspx file. This isn t a showstopper, and in fact RepeaterTest.aspx does have the binding code intermixed within the user interface code. The DataGrid object shown in the GridTest.aspx example provides some middle ground, in that you actually declare the name of the field to be bound in each column, but you don t have the <%# %> tags that bind code in the .aspx file. The more compelling problem is what happens when you try to bind to the DataReader object and find that there s no data. How might that happen Several ways. First, the CustomerID property is passed in as a parameter in the URL. A user could bookmark the page, capturing the CustomerID value as well. If the user visits the page again and the CustomerID value is no longer valid, the error will occur. I might also get to this page without a valid CustomerID when I try to add a customer. The +New link at the bottom of the page in Figure 9-8 links to EditCustomer.aspx with a CustomerID of 0, indicating that I want to add a new record. Manually setting the text box controls within the code-behind file works well, and because data binding is read-only anyway, there already needs to be code to handle saving updates that deals with each text box in any event.
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The final type of validator is the CompareValidator control. The ContractEnds field is a date. Although I can t be sure exactly when the date will be in the past or in the future I do know that it must be a valid date. The CompareValidator control is the answer to this problem, with a particular set of attributes specified, as follows: <asp:CompareValidator ID=CompareValidator1 Runat=server ErrorMessage="*"
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Type=Date Display=Dynamic ControlToValidate="ContractEnds" Operator="DataTypeCheck"> </asp:CompareValidator> The significant attributes here are Type=Date, which indicates that the field should contain a date; ControlToValidate= ContractEnds , which points to the control that should contain the date; and Operator= DataTypeCheck , which tells the .NET Framework that I m just checking that the correct data type has been entered. Finally, several button controls appear toward the bottom of the page. One problem with validator controls is what to do when you just want to get out of the page. For example, when you click the Cancel button, you certainly don t want to force the user to enter valid information in each of the fields containing validators. The answer is to set the CausesValidation attribute of the Cancel button to False. This will disable client and server validation, allowing your server-side button click handler to do what it needs to do. In this example, the server-side button handler for the Cancel button will simply redirect the user back to the RepeaterTest.aspx page. Processing Data Entry The code-behind file for EditCustomer.aspx, EditCustomer.aspx.cs, is shown in Listing 97. Listing 9-7 EditCustomer.aspx.cs, the code-behind file for the Customer Maintenance page
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using System; using System.Collections; using System.ComponentModel; using System.Data; using System.Drawing; using System.Web; using System.Web.SessionState; using System.Web.UI; using System.Web.UI.WebControls; using System.Web.UI.HtmlControls; namespace 09_Template { /// <summary> /// Summary description for EditCustomer. /// </summary> public class EditCustomer : System.Web.UI.Page
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{ protected DropDownList ddlState; protected TextBox CompanyName; protected TextBox Address; protected TextBox City; protected TextBox PostalCode; protected Label Label1; protected TextBox ContractEnds; protected RequiredFieldValidator RequiredFieldValidator1; protected CompareValidator CompareValidator1; protected RequiredFieldValidator RequiredFieldValidator2; protected RequiredFieldValidator RequiredFieldValidator3; protected RequiredFieldValidator RequiredFieldValidator4; protected RequiredFieldValidator RequiredFieldValidator5; protected RegularExpressionValidator RegularExpressionValidator1; protected TextBox ContactEmail; protected RequiredFieldValidator Requiredfieldvalidator6; protected RegularExpressionValidator RegularExpressionValidator2; protected TextBox ContactLastName; protected RequiredFieldValidator Requiredfieldvalidator7; protected TextBox ContactFirstName; protected TextBox UserName; protected TextBox Password; protected RequiredFieldValidator Requiredfieldvalidator8; protected RequiredFieldValidator Requiredfieldvalidator9; protected RequiredFieldValidator Requiredfieldvalidator10; protected Button BtnSave; protected Button BtnCancel; protected Button btnDelete; protected SqlDataReader dr;
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public int CustomerID { get { return (int)ViewState["CustomerID"]; } set { ViewState["CustomerID"]=value; } } public EditCustomer() { Page.Init += new System.EventHandler(Page_Init); } private void doDataBind() { System.Data.SqlClient.SqlConnection cn; System.Data.SqlClient.SqlConnection cnState; System.Data.SqlClient.SqlCommand cmd; System.Data.SqlClient.SqlCommand cmdState; cn=new System.Data.SqlClient.SqlConnection( "server=localhost;" + "Integrated Security=SSPI;Initial Catalog=GolfArticles"); cnState=new System.Data.SqlClient.SqlConnection( "server=localhost;" + "Integrated Security=SSPI;Initial Catalog=GolfArticles"); cmd=new System.Data.SqlClient.SqlCommand( "spSelectCustomer",cn); cmd.CommandType=CommandType.StoredProcedure; cmd.Parameters.Add("@CustomerID", Request.QueryString["CustomerID"]); cmdState=new System.Data.SqlClient.SqlCommand( "SELECT StateAbbreviation FROM " + "States ORDER BY StateAbbreviation",
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cnState); try { cn.Open(); dr=cmd.ExecuteReader( CommandBehavior.CloseConnection); cnState.Open(); ddlState.DataTextField="StateAbbreviation"; ddlState.DataSource=cmdState.ExecuteReader( CommandBehavior.CloseConnection); if ( dr.Read() ) { this.DataBind(); ddlState.SelectedIndex=ddlState.Items.IndexOf( ddlState.Items.FindByText(dr.GetString(4))); CompanyName.Text=(string)dr["CompanyName"]; Address.Text=(string)dr["Address"]; City.Text=(string)dr["City"]; PostalCode.Text=(string)dr["PostalCode"]; ContractEnds.Text= ((DateTime)dr["ContractEnds"]).ToShortDateString(); ContactEmail.Text=(string)dr["ContactEmail"]; ContactFirstName.Text=(string)dr["ContactFirstName"]; ContactLastName.Text=(string)dr["ContactLastName"]; UserName.Text=(string)dr["UserName"]; Password.Text=(string)dr["Password"]; // Close data reader, and thus connection. dr.Close(); } else
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{ this.DataBind(); } } catch ( System.Exception eLoad) { // Handle it... Label1.Text=eLoad.Message; btnDelete.Visible=false; }
private void Page_Load(object sender, System.EventArgs e) { // Put user code to initialize the page here
if ( !(this.IsPostBack) ) { CustomerID=System.Convert.ToInt32( (string)Request["CustomerID"]); doDataBind(); } if ( CustomerID!=0 ) { btnDelete.Visible=true; } else { btnDelete.Visible=false;
} private void Page_Init(object sender, EventArgs e) { // // CODEGEN: This call is required by the // ASP.NET Web Form Designer. // InitializeComponent(); } #region Web Form Designer generated code /// <summary> /// Required method for Designer support - do not modify /// the contents of this method with the code editor. /// </summary> private void InitializeComponent() { this.BtnSave.Click += new System.EventHandler(this.BtnSave_Click); this.BtnCancel.Click += new System.EventHandler(this.BtnCancel_Click); this.btnDelete.Click += new System.EventHandler(this.btnDelete_Click); this.Load += new System.EventHandler(this.Page_Load);
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