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Learn Financial Modeling Markets Using Visual Basic NET_9

Tham khảo tài liệu 'learn financial modeling markets using visual basic net_9', công nghệ thông tin, hệ điều hành phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả | XML 313 If needed the entire path to the .dtd file can be specified for example C ModelingFM xml fmml.dtd. If the DTD is public as in the FMML case meaning that it is available on the Internet the syntax will be DOCTYPE Tradedoc SYSTEM http yorkville.rice. _ iit.edu 8100 FMML.dtd When a DTD exists as a URI it becomes especially powerful. Assuming that all partners who exchange XML messages can access the DTD they all can use it to create and validate their XML documents anywhere in the world. Let s take a look. CREATING XML DOCUMENTS Before we create an Internet application let s first develop a simple VB.NET application that will write an XML document and save it to the C drive. Step 1 In VB.NET create a new Windows application named XMLexample. Step 2 On your Forml add controls to build the GUI shown in Figure 18.2. There should be two combo boxes on your form. Name them cboExchange and cboBuySell. In the Collection property of cboExchange add the elements CBOE ISE BOX AMEX and FMEX. In the Collection property of cboBuySell add the elements Buy and Sell. Give the text boxes the appropriate names txtTicker txtQuantity txtPrice txtClearingFirm and txtTrader. Step 3 To the Button1_Click event add the following code Imports System.IO Public Class Forml Inherits System.Windows.Forms.Form Windows Form Designer Generated Code Private Sub Button1_Click ByVal sender As . Handles Buttonl.Click Dim strTradeDoc As String strXMLtrade xml version 1.0 strXMLtrade Tradedoc strXMLtrade Trade strXMLtrade Exchange Acronym cboExchange.Text strXMLtrade Ticker txtTicker.Text Ticker Team-LRN 314 Advanced VB.NET FIGURE 18.2 strXMLtrade BuySell Type cboBuySell.Text strXMLtrade Quantity txtQuantity.Text Quantity strXMLtrade Price Type txtPrice.Text strXMLtrade ClearingFirm txtClearingFirm.Text ClearingFirm strXMLtrade Trader txtTrader.Text Trader strXMLtrade Time Now Time strXMLtrade Trade strXMLtrade Tradedoc Dim objWriter As New StreamWriter C ModelingFM myFirstXMLdoc.xml .