.net core barcode generator

.net core barcode generator

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Msg.Text="ServerValidation called and FALSE returned."; args.IsValid=false; } } ServerValidateEventArgs has two properties that are important for this example: Value and IsValid. Value is used to get the value of the control, useful for performing the custom validation that s the goal of CustomServerVal. Value is a read-only property. The CustomServerVal function does nothing more than perform a simple comparison between the value and the literal string Hello . If Value equals Hello and no exception is thrown during the check, the function sets the IsValid property of the ServerValidateEventArgs instance to true. If IsValid is set to false, the CustomValidator control will fire, displaying the error message specified either in the ErrorMessage attribute or between the start and end tags of the CustomValidator control. As with the other validators, CustomValidator can also perform some of its checking on the client side. The ClientValidationFunction attribute allows you to specify which function on the client side should be used to validate the control pointed to by the ControlToValidate attribute. This example contains no client-side validation, but a reasonable implementation would be as follows: <script language="javascript"> function ClientValidate(source, value) { if (value == "Hello") return true; else return false; } </script> The important thing to recognize about the client-side validation is that you ll almost certainly be using a different language than you use to code the server-side validator function. This can lead to interesting problems. For instance, in this simple example, is the comparison of the string Hello case sensitive on both the client side and the server side Ensuring the same case sensitivity would require knowledge of each of the languages involved. Multiple Validators on a Single Field Loading the ValidatorTest.aspx page from Listing 5-4 and clicking Validate displays the page shown in Figure 5-8.

For the VPN connection to the Portland office, the user account VPN_Portland is created with the following settings:

You will learn a lot about querying database data with XML in the next lesson. However, the code in this section provides a basic demonstration of using LINQ to SQL (found in the System.Data.Linq namespace). The first step is to create an object model that maps to your data structures. Visual Studio provides tools for this, but you can also use code. The System.Data.Linq.Mapping namespace provides attribute classes for defining objects that map your data structures. For example, the following Employee class is marked to map to the employee table in the pubs sample database. Notice that two columns are mapped to two properties (emp_id to EmployeeId and fname to FirstName) by using the Column attribute.

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Sample of Visual Basic Code <Table(Name:="employee")> _ Public Class Employee Private _empID As String <Column(IsPrimaryKey:=True, Storage:="_empID", Name:="emp_id")> _ Public Property EmployeeId() As String

Password of P*4s=wq!Gx1. For the account properties of the VPN_Portland account, the User Must

Private _firstName As String <Column(Storage:="_firstName", Name:="fname")> _ Public Property FirstName() As String Get Return _firstName End Get Set(ByVal value As String) _firstName = value End Set End Property End Class Sample of C# Code [Table(Name = "employee")] public class Employee { private string _empID; [Column(IsPrimaryKey = true, Storage = "_empID", Name = "emp_id")] public string EmployeeId { get { return this._empID; } set { this._empID = value; } } private string _firstName; [Column(Storage = "_firstName", Name = "fname")] public string FirstName { get { return this._firstName; } set { this._firstName = value; } } }

The next step is to define a connection to the database. If you are using a file-based database, you can simply point to the file. If you are using a server, you would use a connection string. In either case, your connection is defined as a DataContext object. The following code shows an example.

Figure 5-8 : The page that results from clicking the Validate button with no values filled in Notice that it displays the message Page Valid . This is almost certainly not what you wanted! You specified that the first field should be a number between 1 and 12, that the

Sample of Visual Basic Code Dim pubs As DataContext = New DataContext("c:\code\pubs.mdf") Sample of C# Code DataContext pubs = new DataContext(@"c:\code\pubs.mdf");

permission is set to Control Access Through Remote Access Policy and the static route 192.168.4.0 with a subnet mask of 255.255.255.0 is added.

You can now set a reference to a table in the database by using the Table<T> object. You can then run a LINQ query against this table and store the results in a list of Employee objects. LINQ to SQL will take care of the mapping for you. The following code shows an example.

Sample of Visual Basic Code Dim Employees As Table(Of Employee) = pubs.GetTable(Of Employee)() Dim empQuery As IEnumerable(Of Employee) = From emp In Employees Where emp.FirstName.Length > 5 Select emp Sample of C# Code Table<Employee> Employees = pubs.GetTable<Employee>(); IEnumerable<Employee> empQuery = from emp in Employees where emp.FirstName.Length > 5 select emp;

To define the authentication and encryption settings for the VPN routers, the following remote access policy is created:

Of course, you can iterate over the results as you would with any other IEnumerable list of objects. You can also use LINQ to SQL to insert, update, and delete rows in your database.

second field should be some string that looks like a social security number, and that the last field should be Hello . But it turns out that, by design, all validators except RequiredFieldValidator don t validate against an empty control. There must be a solution. One solution is to use the RequiredFieldValidator control. Listing 5-5 shows a modified version of ValidatorTest.aspx, named ValidatorTestRequired.aspx. The difference between ValidatorTest.aspx (which is shown in Listing 5-4) and ValidatorTestRequired.aspx is the addition of a RequiredFieldValidator control for each of the fields covered by another validator. Listing 5-5 ValidatorTestRequired.aspx, a page that requires all fields to be filled, with valid data

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