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A DataSet is a memory-based relational representation of data and is the primary disconnected data object used in many ASP.NET applications. A DataSet contains a collection of DataTable and DataRelation objects, as shown in Figure 11-2 (which was built with the DataSet designer in Visual Studio). DataSet

17. On the Custom Actions page, click New. 18. In the New Custom Action dialog box, type Automatic Certificate Enroll ment in the Description text box. In Program To Run, click Browse and browse to the Cmgetcer.dll file in the \Program Files\Windows Resource Kits\Tools folder. In the Parameters text box, type GetCertificate /type 0 /name %ServiceName% /dir %ServiceDir% /f cmconfig.txt /a 1. In the Action Type drop-down list, click Post-connect. In the Run This Custom Action For drop-down list, click All Connections. Clear the Program Interacts With The User check box (as shown in Figure 7-31), and click OK.

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The DataTable objects contain the data in the DataSet. The table schema is defined as a collection of DataColumn objects. The data itself is stored in a collection of DataRow objects. The DataRelation objects define relationships between DataTable objects in the DataSet. These relationships are defined through DataColumn objects. Relationships are similar to foreign-key constraints in a database. These relationships are enforced in the DataSet. The DataSet class also provides methods for cloning the DataSet schema, copying the DataSet, merging with other DataSet objects, and retrieving changes from the DataSet.

Before you work with actual data, you need to define the schema the layout or structure of the data. You can do so automatically when you load a DataSet from a database (see the next section, Populating the DataSet ). You can also define the schema programmatically or by providing an XML schema definition. The following code demonstrates the creation of a simple DataSet object in code. This DataSet contains a DataTable for companies and a DataTable for employees. The two DataTable objects are joined by using a DataRelation named Company_Employee.

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Sample of Visual Basic Code Private Function GetDataSet() As DataSet Dim companyData As New DataSet("CompanyList") Dim company As DataTable = companyData.Tables.Add("company") company.Columns.Add("Id", GetType(Guid)) company.Columns.Add("CompanyName", GetType(String)) company.PrimaryKey = New DataColumn() {company.Columns("Id")} Dim employee As DataTable = companyData.Tables.Add("employee") employee.Columns.Add("Id", GetType(Guid)) employee.Columns.Add("companyId", GetType(Guid)) employee.Columns.Add("LastName", GetType(String)) employee.Columns.Add("FirstName", GetType(String)) employee.Columns.Add("Salary", GetType(Decimal)) employee.PrimaryKey = New DataColumn() {employee.Columns("Id")} companyData.Relations.Add( _ "Company_Employee", _ company.Columns("Id"), _ employee.Columns("CompanyId")) Return companyData End Function Sample of C# Code private DataSet GetDataSet() { DataSet companyData = new DataSet("CompanyList"); DataTable company = companyData.Tables.Add("company"); company.Columns.Add("Id", typeof(Guid)); company.Columns.Add("CompanyName", typeof(string)); company.PrimaryKey = new DataColumn[] { company.Columns["Id"] }; DataTable employee = companyData.Tables.Add("employee"); employee.Columns.Add("Id", typeof(Guid)); employee.Columns.Add("companyId", typeof(Guid)); employee.Columns.Add("LastName", typeof(string)); employee.Columns.Add("FirstName", typeof(string)); employee.Columns.Add("Salary", typeof(decimal)); employee.PrimaryKey = new DataColumn[] { employee.Columns["Id"] }; companyData.Relations.Add( "Company_Employee", company.Columns["Id"], employee.Columns["CompanyId"]); return companyData; }

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There are several ways to actually get data into the DataTable objects of a DataSet. Recall that you first must define the schema. You can then write code to add rows. Alternatively, you can use a DataAdapter to fill a DataTable from an existing data source (such as a Microsoft SQL Server database). This section examines both of these options.

The following code sample shows how to add rows to existing DataTable objects. These objects were defined in the previous example. This code uses the DataTable.Rows.Add method. This method allows you to define a new DataRow object and add it to the Rows collections. The code populates the Id columns by creating a new globally unique identifier (GUID). After a company is created and added to the company DataTable, the employee names for that company are created and added.

33. On the Ready To Build The Service Profile page, select the Advanced Customization check box (as shown in Figure 7-33), and then click Next.