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private void button1_Click(object sender, EventArgs e) { string id = comboBox1.SelectedItem.ToString(); EmployeesDataSet.EmployeesRow[] rows = (EmployeesDataSet.EmployeesRow[])ds.Employees.Select("EmployeeID=" + id); rows[0].BeginEdit(); rows[0].FirstName = textBox1.Text; rows[0].LastName = textBox2.Text; rows[0].HomePhone = textBox3.Text; rows[0].Notes = textBox4.Text; rows[0].EndEdit(); } private void button3_Click(object sender, EventArgs e) { string id = comboBox1.SelectedItem.ToString(); EmployeesDataSet.EmployeesRow[] rows = (EmployeesDataSet.EmployeesRow[])ds.Employees.Select("EmployeeID=" + id); rows[0].Delete(); FillEmployees(); } Notice the changes made to the original code. In the Click event handler of the Insert button, the new DataRow is created by calling NewEmployeesRow(). The typed DataSet automatically show the available DataTable objects as properties, and each DataTable provides the NewEmployeesRow() method to create a new row. The newly created row is of type EmployeesRow, which is a nested class generated by Visual Studio in the EmployeesDataSet class. EmployeesRow exposes each column of the row as a property, and these properties can then be assigned new values. The newly created row is then added to the Employees DataTable by using its AddEmployeesRow() method. There are similar modifications in the Click event handlers of the Update and Delete buttons.

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Note After you obtain your test account, be sure to download the DataCash Developer s Guide at https://

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Though Visual Studio provides a visual way to create typed DataSets, the .NET Framework also provides a command-line tool called xsd.exe that can generate typed DataSets for you. The tool accepts an XSD schema and outputs the typed DataSet class. Though we will not discuss the xsd.exe tool at great length, here is a sample use of it: xsd.exe /d /l:CS Employees.xsd /n:MyTypedDataSets The /d switch indicates that the tool should generate a typed DataSet. The /l switch specifies the language used to create the output typed DataSet class. In our example, we specify the language as C# (CS). Finally the /n switch specifies the namespace in which the typed DataSet class will be placed. The output of the preceding command will be a class file named Employees.cs. You can compile this class file separately or along with your other classes. This is the official document you can rely on to have accurate and recent information about any DataCash services.

Click on text link Custom Domain. You ll see the screen for buying your own domain (see Figure 5-2).

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We ll be doing a lot of XML manipulation when communicating with DataCash, because we ll need to create XML documents to send to DataCash and to extract data from XML responses. In the following few pages, we ll take a quick look at the XML required for the operations we ll be performing and the responses we can expect. We ll discuss the communication protocol, which implies discussing the XML files that reflect the following stages of a transaction: Preauthentication request Response to the preauthentication request Fulfillment request Fulfillment response We ll implement these stages into the BalloonShop order pipeline. While reading this chapter, always remember to use the official documentation, which contains the most current and relevant updates, at

There is no doubt that the DataSet class provides rich XML functionality, but what if you need to do the following in your application Sort, filter, and bind the data effectively in your application Apply XSLT transformations and run XPath expressions Work with your XML data in a relational manner, still keeping its hierarchical nature intact All the preceding requirements call for a technique that will bridge the relational model of DataSet and the hierarchical model of XmlDocument, and the XmlDataDocument provides just such a bridge. It allows you to synchronize data from a DataSet and an XML document, and inherits from XmlDocument as the base class. Naturally, it provides all the functionality of DOM. An XmlDataDocument class can be constructed in two ways depending on your requirement: From a DataSet From an XML document

When you send a preauthentication request to DataCash, you need to include the following information: DataCash username (known as the DataCash client) DataCash password A unique transaction reference number (explained later in this section) The amount of money to be debited The currency used for the transaction (USD, EUR, GBP, and so on) The type of the transaction (the code pre for preauthentication and the code fulfill for fulfillment) The credit card number The credit card expiry date The credit card issue date (if applicable to the type of credit card being used) The credit card issue number (if applicable to the type of credit card being used)

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