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各位前辈,我不知道在vb.net中引用system.data.ado,没有找到.
ywqs208
2003-09-11 12:47:42
各位前辈,我不知道在vb.net中引用system.data.ado,没有找到.但是我用习惯了ado,
不知道ado在vb.net 中的使用,帮帮忙啦!!!急~~~~~~
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各位前辈,我不知道在vb.net中引用system.data.ado,没有找到.
各位前辈,我不知道在vb.net中引用system.data.ado,没有找到.但是我用习惯了ado, 不知道ado在vb.net 中的使用,帮帮忙啦!!!急~~~~~~
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ArLi2003
2003-09-11
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data.ado 是beta 版有,
如果你是想用旧的ado 而不是ado.net 可以参见:
http://expert.csdn.net/Expert/topicview.asp?id=1900135
cockroach4
2003-09-11
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Imports ADODB.ConnectionClass
Imports ADODB.RecordClass
Imports ADODB.CursorLocationEnum
Sunny21
2003-09-11
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Imports system.data
Imports system.data.OleDb
lz305
2003-09-11
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楼上的命名空间写错了。
imports system.data.sqlclient 'sql server
imports system.data.oledb ' access
sindyzhou
2003-09-11
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没有这个空间,
imports system.data.sql
imports system.data.odbc
VBNET数据库编程基础教程.doc
VBNET数据库编程基础教程 众所周知,
VB.NET
自身并不具备对数据库进行操作的功能,它对数据库的处理是通过.N ET FrameWork SDK
中
面向数据库编程的类库和微软的MDAC来实现的。其
中
,
ADO
.NET又是.NET FrameWork SDK
中
重要的组成部分。要了解
VB.NET
的数据库编程,首先要明白
ADO
.NET的工作原理以 及相关的对象、方法、属性。本文将结合具体实例为你简单介绍
ADO
.NET数据库访问对象 以及
VB.NET
数据库编程基本方法。 一、
ADO
.NET数据库访问对象 (一)
ADO
.NET简介
ADO
.NET是由微软Microsoft ActiveX
Data
Object(
ADO
)升级发展而来的。是在.NET
中
创建分布式数据共享程序的开发接口。
ADO
.N ET的数据存取API提供两种数据访问方式,分别用来识别并处理两种类型的数据源,即S QL Server7.0(及更高的版本)和可以通过OLE DB进行访问的其他数据源。为此
ADO
.NET
中
包含了两个类库,System.
Data
.SQL库可以直 接连接到SQL Server的数据,System.
Data
.A
VB.NET
Developer's Guide(4574).pdf
Contents xvii Web Forms 133 Intellisense 134 Customizing the IDE 135 Customizing the Code Editor 135 Customizing Shortcut Keys 135 Customizing the Toolbars 136 Exercise 3.4 Adding a New Toolbar to the Existing Set 136 Exercise 3.5 Adding Commands to Toolbars 137 Customizing Built-In Commands 137 Exercise 3.6 Creating an Alias 138 Customizing the Start Page 139 Accessibility Options 141 Summary 142 Solutions Fast Track 142 Frequently Asked Questions 143 Chapter 4 Common Language Runtime 145 Introduction 146 Component Architecture 148 Managed Code versus Unmanaged Code 150 Interoperability with Managed Code 152 System Namespace 153 File I/O 155 Drawing 156 Printing 157 Common Type System 158 Type Casting 160 Garbage Collection 163 Object Allocation/Deallocation 164 Close/Dispose 165 Summary 166 Solutions Fast Track 167 Frequently Asked Questions 168 Developing & Deploying… Embrace Your Parameters
VB.NET
is insistent upon enclosing parameters of function calls within parentheses regardless of whether we are returning a value or whether we are using the Call statement. It makes the code much more readable and is a new standard for VB programmers that is consistent with the standard that nearly all other languages
ado
pted long ago. 153_VBnet_TOC 8/16/01 1:12 PM Page xvii xviii Contents Chapter 5 .NET Programming Fundamentals 171 Introduction 172 Variables 173 Constants 175 Structures 176 Program Flow Control 178 If…Then…Else 178 Select Case 182 While Loops 184 For Loops 186 Arrays 187 Declaring an Array 188 Multidimensional Arrays 189 Dynamic Arrays 191 Functions 192 Object Oriented Programming 196 Inheritance 196 Polymorphism 197 Encapsulation 197 Classes 198 Adding Properties 198 Adding Methods 200 System.Object 201 Constructors 201 Overloading 202 Overriding 203 Shared Members 205 String Handling 206 Error Handling 210 Summary 213 Solutions Fast Track 214 Frequently Asked Questions 217 NOTE When porting Visual Basic applications to Visual Basic .NET, be careful of the lower bounds of arrays. If you are using a for loop to iterate through the array, and it is hard-coded to initialize the counter at 1, the first element will be skipped. Remember that all arrays start with the index of 0. 153_VBnet_TOC 8/16/01 1:12 PM Page xviii Contents xix Chapter 6 Advanced Programming Concepts 219 Introduction 220 Using Modules 221 Utilizing Namespaces 222 Creating Namespaces 222 Understanding the Imports Keyword 226 Implementing Interfaces 229 Delegates and Events 232 Simple Delegates 235 Multicast Delegates 236 Event Programming 236 Handles Keyword 236 Language Interoperability 237 File Operations 239 Directory Listing 239
Data
Files 241 Text Files 243 Appending to Files 246 Collections 246 The Drawing Namespace 248 Images 253 Printing 256 Understanding Free Threading 262 SyncLock 263 Summary 265 Solutions Fast Track 265 Frequently Asked Questions 267 Chapter 7 Creating Windows Forms 269 Introduction 270 Application Model 270 Properties 271 Manipulating Windows Forms 275 Properties of Windows Forms 275 Methods of Windows Forms 276 Creating Windows Forms 287 What Are Collections? Collectionsare groups of like objects. Collections are similar to arrays, but they don’t have to be redimensioned. You can use the Addmethod to add objects to a collection. Collections take a little more code to create than arrays do, and sometimes accessing a collection can be a bit slower than an array, but they offer significant advantages because a collection is a group of objects whereby an array is a
data
type. 153_VBnet_TOC 8/16/01 1:12 PM Page xix xx Contents Displaying Modal Forms 288 Displaying Modeless Forms 289 Displaying Top-Most Forms 289 Changing the Borders of a Form 289 Resizing Forms 291 Setting Location of Forms 292 Form Events 294 Creating Multiple Document Interface Applications 297 Creating an MDI Parent Form 297 Creating MDI Child Forms 298 Exercise 7.1 Creating an MDI Child Form 298 Determining the Active MDI Child Form 299 Arranging MDI Child Forms 299 Adding Controls to Forms 300 Anchoring Controls on Forms 301 Docking Controls on Forms 303 Layering Objects on Forms 304 Positioning Controls on Forms 304 Dialog Boxes 305 Displaying Message Boxes 306 Common Dialog Boxes 306 The OpenFileDialog Control 306 The SaveFileDialog Control 309 The FontDialog Control 311 The ColorDialog Control 313 The PrintDialog Control 315 The PrintPreviewDialog Control 316 The PageSetupDialog Control 321 Creating Dialog Boxes 322 Creating and Working with Menus 323 Adding Menus to a Form 323 Exercise 7.2 Adding a Menu to a Form at Design Time 323 Creating Dialog Boxes 1.Create a form. 2.Set the BorderStyle property of the form to FixedDialog. 3.Set the ControlBox, MinimizeBox, and MaximizeBox properties of the form to False. 4.Customize the appearance of the form appropriately. 5.Customize event handlers in the Code window appropriately. 153_VBnet_TOC 8/16/01 1:12 PM Page xx Contents xxi Dynamically Creating Menus 326 Exercise 7.3 Adding a Menu to a Form at Design Time 326 Adding Status Bars to Forms 328 Adding Toolbars to Forms 330
Data
Binding 332 Simple
Data
Binding 332 Complex
Data
Binding 333
Data
Sources for
Data
Binding 333 Using the
Data
Form Wizard 334 Using the Windows Forms Class Viewer 338 Using the Windows Forms ActiveX Control Importer 338 Summary 340 Solutions Fast Track 340 Frequently Asked Questions 344 Chapter 8 Windows Forms Components and Controls 347 Introduction 348 Built-In Controls 348 Label Control 351 LinkLabel Control 354 TextBox Control 357 Button Control 361 CheckBox Control 364 RadioButton Control 365 RichTextBox Control 367 TreeView Control 369 ListBox Control 371 CheckedListBox Control 374 ListView Control 376 ComboBox Control 381 DomainUpDown Control 384 NumericUpDown Control 386 PictureBox Control 388 TrackBar Control 389 Adding Items to a Combo Box at Design-Time 1.Select the ComboBox control on the form. 2.If necessary, use the Viewmenu to open the Properties window. 3.In the Properties window, click the Itemsproperty, then click the ellipsis. 4.In String Collection Editor, type the first item, then press Enter. 5.Type the next items, pressing Enterafter each item. 6.Click OK. 153_VBnet_TOC 8/16/01 1:13 PM Page xxi xxii Contents DateTimePicker Control 391 Panel Control 394 GroupBox Control 396 TabControl Control 397 Creating Custom Windows Components 399 Exercise 8.1:Creating a Custom Windows Component 399 Creating Custom Windows Controls 403 Exercise 8.2:Creating a Custom Windows Control 404 Summary 407 Solutions Fast Track 407 Frequently Asked Questions 408 Chapter 9 Using
ADO
.NET 409 Introduction 410 Overview of XML 411 XML Documents 411 XSL 411 XDR 412 XPath 412 Understanding
ADO
.NET Architecture 412 Differences between
ADO
and
ADO
.NET 414 XML Support 414
ADO
.NET Configuration 415 Remoting in
ADO
.NET 415 Maintaining State 415 Using the XML Schema Definition Tool 416 Connected Layer 417
Data
Providers 418 Connection Strings 418 Exercise 9.1 Creating a Connection String 419 Command Objects 421
Data
Reader 425
Data
Set 426 XML Documents XML documents are the heart of the XML standard. An XML document has at least one element that is delimited with one start tag and one end tag. XML documents are similar to HTML, except that the tags are made up by the author. 153_VBnet_TOC 8/16/01 1:13 PM Page xxii Contents xxiii Disconnected Layer 427 Using
Data
Set 428 Relational Schema 428 Collection of Tables 430
Data
States 431 Populating with the
Data
Set Command 432 Populating with XML 433 Populating Programmatically 434 Using the SQL Server
Data
Provider 435 TDS 436 Exercise 9.2 Using Typed
Data
Set 437 Remoting 439
Data
Controls 440
Data
Grid 440 Exercise 9.3 Using Typed
Data
Set and
Data
Relation 441
Data
List 446 Repeater 450 Summary 454 Solutions Fast Track 454 Frequently Asked Questions 457 Chapter 10 Developing Web Applications 459 Introduction 460 Web Forms 461 A Simple Web Form 462 Exercise 10.1 Creating a Simple Web Form 462 How Web Forms Differ from Windows Forms 464 Why Web Forms Are Better Than Classic ASP 465 Adding Controls to Web Forms 467 Exercise 10.2 Adding Web Controls to a Web Form 468 Code Behind 473 NOTE Web form controls not only detect browsers such as Internet Explorer and Netscape, but they also detect devices such as Palm Pilots and cell phones and generate appropriate HTML accordingly. 153_VBnet_TOC 8/16/01 1:13 PM Page xxiii xxiv Contents How Web Form Controls Differ from Windows Form Controls 476 ASP.NET Server Controls 476 Intrinsic Controls 476 Bound Controls 478 Exercise 10.3 Using the
Data
Grid Control 478 Exercise 10.4 Customizing
Data
Grid Control 482 Custom Controls 487 Validation Controls 488 Exercise 10.5 Using the Validation Controls 489 Creating Custom Web Form Controls 492 Exercise 10.6 A Simple Custom Control 493 Exercise 10.7 Creating a Composite Custom Control 497 Web Services 504 How Web Services Work 505 Developing Web Services 505 Exercise 10.8 Developing Web Services 507 Web Service Utilities 509 Service Description Language 509 Discovery 510 Proxy Class 510 Consuming Web Services from Web Forms 511 Exercise 10.9 Consuming Web Services from Web Forms 511 Using Windows Forms in Distributed Applications 513 Exercise 10.10 Consuming Web Services from Windows Forms 514 Exercise 10.11 Developing a Sample Application 516 Summary 519 Solutions Fast Track 519 Frequently Asked Questions 521 153_VBnet_TOC 8/16/01 1:13 PM Page xxiv Contents xxv Chapter 11 Optimizing, Debugging, and Testing 523 Introduction 524 Debugging Concepts 524 Debug Menu 528 Watches 529 Breakpoints 531 Exceptions Window 532 Command Window 534 Conditional Compilation 536 Trace 538 Assertions 540 Code Optimization 541 Finalization 542 Transitions 542 Parameter Passing Methods 542 Strings 543 Garbage Collection 544 Compiler Options 544 Optimization Options 544 Output File Options 544 .NET Assembly Options 545 Preprocessor Options 546 Miscellaneous Options 546 Testing Phases and Strategies 546 Unit Testing 547 Integration Testing 547 Beta Testing 547 Regression Testing 548 Stress Testing 548 Monitoring Performance 548 Summary 550 Solutions Fast Track 551 Frequently Asked Questions 552 What Are Watches? Watchesprovide us with a mechanism where we can interact with the actual
data
that is stored in our programs at runtime. They allow us to see the values of variables and the values of properties on objects. In addition to being able to view these values, you can also assign new values. 153_VBnet_TOC 8/16/01 1:13 PM Page xxv xxvi Contents Chapter 12 Security 553 Introduction 554 Security Concepts 555 Permissions 555 Principal 556 Authentication 557 Authorization 557 Security Policy 558 Type Safety 558 Code Access Security 558 .NET Code Access Security Model 559 Stack Walking 559 Code Identity 561 Code Groups 562 Declarative and Imperative Security 564 Requesting Permissions 565 Demanding Permissions 570 Overriding Security Checks 572 Custom Permissions 576 Role-Based Security 578 Principals 578 WindowsPrincipal 579 GenericPrincipal 580 Manipulating Identity 581 Role-Based Security Checks 583 Security Policies 585 Creating a New Permission Set 588 Modifying the Code Group Structure 593 Remoting Security 600 Cryptography 600 Security Tools 603 Summary 606 Solutions Fast Track 607 Frequently Asked Questions 611 Within the .NET Framework, Three Namespaces Involve Cryptography 1.System.Security .CryptographyThe most important one; resembles the CryptoAPI functionalities. 2.System.Security .Cryptography.X509 certificatesRelates only to the X509 v3 certificate used with Authenticode. 3.System.Security .Cryptography.XmlFor exclusive use within the .NET Framework security system. 153_VBnet_TOC 8/16/01 1:13 PM Page xxvi Contents xxvii Chapter 13 Application Deployment 615 Introduction 616 Packaging Code 617 Configuring the .NET Framework 622 Creating Configuration Files 622 Machine/Administrator Configuration Files 623 Application Configuration Files 625 Security Configuration Files 626 Deploying the Application 629 Common Language Runtime 629 Windows Installer 630 CAB Files 631 Internet Explorer 5.5 632 Resource Files 633 Deploying Controls 637 Summary 639 Solutions Fast Track 640 Frequently Asked Questions 642 Chapter 14 Upgrading Visual Basic Applications to .NET 647 Introduction 648 Considerations Before Upgrading 648 Early Binding of Variables 649 Avoiding Null Propagation 650 Using
ADO
651 Using Date
Data
Type 652 Using Constants 652 Considering Architecture Before Migration 653 Intranet/Internet Applications 653 Internet Information Server (IIS) Applications 654 DHTML Applications 655 ActiveX Documents 655 Client/Server and Multi-Tier Applications 655 Single-Tier Applications 656
Data
Access Applications 656 WARNING You should under no circumstance edit the Security.config and Enterprise.config files directly. It is very easy to compromise the integrity of these files. Always use the Code Access Security Policy utility (caspol.exe) or the .NET Configuration tool; these will guard the integrity of the files and will also make a backup copy of the last saved version. 153_VBnet_TOC 8/16/01 1:13 PM Page xxvii xxviii Contents
Data
Types 657 Variants 657 Integers 658 Dates 658 Boolean 659 Arrays 659 Fixed-Length Strings 660 Windows API
Data
Types 661 Converting VB Forms to Windows Forms 662 Control Anchoring 664 Keyword Changes 665 Goto 666 GoSub 666 Option Base 666 AND/OR 666 Lset 666 VarPtr 667 StrPtr 667 Def 667 Programming Differences 668 Method Implementation 668 Optional Parameters 668 Static Modifier 669 Return Statement 669 Procedure Calls 670 External Procedure Declaration 671 Passing Parameters 672 ParamArray 672 Overloading 674 References to Unmanaged Libraries 677 Meta
data
679 Runtime Callable Wrapper 681 COM Callable Wrapper 682 Properties 684 Working with Property Procedures 684 Control Property Name Changes 685 Default Property 687 Avoiding Null Propagation Nullpropagation means that if Null is used in an expression, the resulting expression is always Null. In previous versions of Visual Basic, the Null value disseminated throughout the expression. 153_VBnet_TOC 8/16/01 1:13 PM Page xxviii Contents xxix Null Usage 690 Understanding Error Handling 690 Exercise 14.1:Using Error Handling 692
Data
Access Changes in Visual Basic .NET 693
Data
set and Recordset 694 Application Interoperability 694 Cursor Location 695 Disconnected Access 695
Data
Navigation 695 Lock Implementation 696 Upgrading Interfaces 696 Upgrading Interfaces from Visual Basic 6.0 699 Using the Upgrade Tool 703 Exercise 14.2 Using the Upgrade Wizard 703 Summary 708 Solutions Fast Track 709 Frequently Asked Questions 712 Index 713 Contents xiii From the Series Editor xxxi Chapter 1 New Features in Visual Basic .NET 1 Introduction 2 Examining the New IDE 3 Cosmetic Improvements 3 Development Accelerators 5 .NET Framework 6 A Very Brief and Simplified History 6 .NET Architecture 7 ASP.NET 7 Framework Classes 8 .NET Servers 8 Common Language Runtime 8 History 8 Convergence 9 Object-Oriented Language 10 Object-Oriented Concepts 10 Advantages of Object-Oriented Design 11 History of Object Orientation and VB 13 Namespaces 13 Web Applications 13 Web Applications Overview 13 Web Forms 14 Web Services 15 HyperText Transport Protocol 16 Simple Object Access Protocol 17 .NET Architecture .NET Framework ASP.NET Updated ASP Engine Web Forms Engine Framework Classes System.Math, System.Io, System.
Data
, Etc. Common Language Runtime Memory Management Common Type System Garbage Collection .NET .NET Servers 153_VBnet_TOC 8/16/01 1:12 PM Page xiii xiv Contents Security 17 Type Safety 18 Casting 18
Data
Conversion 19 Bitwise Operations 20 New Compiler 20 Compiling an Executable 20 Architecture 21 File Management in Previous Versions of VB 21 File Management 22 Changes from Visual Basic 6.0 23 Variants 23 Variable Lower Bounds 23 Fixed Length Strings 23 NULL Propagation 23 Other Items Removed 24 Function Values 24 Short Circuits 25 Properties and Variables 25 Variable Lengths 25 Get and Set 26 Date Type 26 Default Properties 27 Summary 28 Solutions Fast Track 28 Frequently Asked Questions 31 Chapter 2 The Microsoft .NET Framework 33 Introduction 34 What Is the .NET Framework? 34 Introduction to the Common Language Runtime 35 Using .NET-Compliant Programming Languages 37 Creating Assemblies 39 Using the Manifest 42 Compiling Assemblies 45 Assembly Cache 45 Locating an Assembly 45 153_VBnet_TOC 8/16/01 1:12 PM Page xiv Contents xv Private Assembly Files 51 Shared Assembly Files 51 Understanding Meta
data
51 The Benefits of Meta
data
52 Identifying an Assembly with Meta
data
53 Types 53 Defining Members 54 Using Contracts 54 Assembly Dependencies 55 Unmanaged Assembly Code 55 Reflection 56 Attributes 57 Ending DLL Hell 58 Side-by-Side Deployment 58 Versioning Support 59 Using System Services 60 Exception Handling 60 StackTrace 61 InnerException 61 Message 61 HelpLink 62 Garbage Collection 62 Console I/O 62 Microsoft Intermediate Language 63 The Just-In-Time Compiler 63 Using the Namespace System to Organize Classes 64 The Common Type System 65 Type Safety 68 Relying on Automatic Resource Management 68 The Managed Heap 69 Garbage Collection and the Managed Heap 71 Assigning Generations 77 Utilizing Weak References 77 Security Services 79 Framework Security 80 Granting Permissions 81 NOTE Visualization is still key! Die-hard VB programmers may find themselves having a hard time visualizing all the new concepts in
VB.NET
(and we all know that proper logic visualization plays a big role in what we do). Something that may help is to think about
VB.NET
as a completely flexible language that can accommodate Web, console, and desktop use. 153_VBnet_TOC 8/16/01 1:12 PM Page xv xvi Contents Gaining Representation through a Principal 82 Security Policy 83 Summary 85 Solutions Fast Track 85 Frequently Asked Questions 88 Chapter 3 Installing and Configuring
VB.NET
91 Introduction 92 Editions 92 Installing Visual Studio .NET 93 Exercise 3.1:Installing Visual Studio .NET 94 Installing on Windows 2000 99 The New IDE 100 Integrated Development Environment Automation Model 100 Add-Ins 104 Exercise 3.2 Creating an Add-In Using the Add-In Wizard 105 Wizards 109 Macros 109 Home Page 110 Project Options 112 Toolbox 116 Child Windows 120 Window Types 122 Arranging Windows 123 Task List 123 Exercise 3.3 Setting Up a Custom Token 124 TaskList Views 124 Locating Code 126 Annotating Code 126 Solution Explorer 127 Properties Window 129 Form Layout Toolbar 130 Hide/Show Code Elements 132 Installing Visual Studio .NET IPhase 1: Installing Windows components IPhase 2: Installing Visual Studio .NET IPhase 3: Checking for service releases 153_VBnet_TOC 8/16/01 1:12 PM Page xvi
用
VB.NET
开发交互式CAD系统
用
VB.NET
开发交互式CAD系统,包括结合GDI+和OPENGL两种方案。 联系平台客服可开发票。
Sqlite 操作类代码
1.
ADO
.NET Provider For SQLite.
ADO
.NET 提供程序是香港(貌似)一个公司提供的.项目地址见:http://sourceforge.net/projects/sqlite-dotnet2 2. 对SQLite.NET的封装,提供一个简单的操作帮助类. SQLiteHelper 代码如下: /**//** * SQLite操作的帮助类. * * Author: egmkang.wang * Date: 2009-06-21 */ namespace System.
Data
.SQLite { using System.
Data
; using Syste
影片管理系统-数据库管理系统.doc
一、设计目标与要求 1、课程设计目的:探讨如何开发数据库应用系统 2、课程设计要求:初步认识和了解
ADO
.NET; 掌握
ADO
.NET存取SQL Sever 2000数据库数据的基本方法; 掌握
VB.NET
操作数据库的方法。 二、课程设计的应用背景及实际工作流程 1、应用背景 电影协会租借电影给学生所用 2、工作流程 需求分析、概念设计、逻辑设计、数据库实施阶段、调试与测试 3、开发环境 SQL Sever 2000数据库、Microsoft Visual Studio 2005 编程语言:T-SQL,vb 三、数据库设计 1、需求分析 根据影片管理的特点,影片管理系统应具有如下基本功能: 1. 能对系统用户进行管理; 2. 能对租借学生数据进行管理,即可以对租借学生数据进行查询、增加、删除、修 改操作; 3. 可对影片数据进行管理,即可对影片数据进行查询、增加、删除、修改操作; 4. 对影片数据的查询可以普通查询、按种类查询、按名称查询。 5. 可对租借影片数据进行管理,即可对租借影片数据进行查询、增加、删除操作; 6. 对租借影片数据的查询可以按学号、影片编号、影片种类查询。 2、概念设计 图1 影片管理系统的E-R简图 3、逻辑设计 创建"影片管理"数据库: 打开企业管理器,创建数据库 创建"用户"表: 图2 用户表 创建"租借学生信息"表: 图4 租借学生信息表属性 创建"影片信息"表: 图5 创建影片信息表 创建"影片租借信息"表: 图6 创建影片租借信息表 四、应用系统设计 1、系统功能模块结构图 图6 影片管理系统功能模块图 2、主要模块的代码实现及关键部分的算法说明 1.公共模块设计 Module Module1 Public flag As Integer Public flagReader As Integer Public flagBook As Integer Public flagBorrow As Integer Sub mian() flag = 0 End Sub End Module 2.主控模块设计 图8 主控界面的设计 主控界面的代码 Imports System.
Data
Imports System.
Data
.SqlClient Public Class Form1 Public Sub Form1_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load If flag = 0 Then MenuItem2.Enabled = False MenuItem3.Enabled = False MenuItem4.Enabled = False Else MenuItem2.Enabled = True MenuItem3.Enabled = True MenuItem4.Enabled = True End If End Sub Private Sub MenuItem1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MenuItem1.Click Dim objChild As New Form2() objChild.MdiParent = Me objChild.frm = Me objChild.Show() End Sub Private Sub MenuItem5_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MenuItem5.Click flagReader = 1 Dim objChild As New Form3() objChild.MdiParent = Me objChild.Show() End Sub Private Sub MenuItem6_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MenuItem6.Click flagReader = 2 Dim objChild As New Form3() objChild.MdiParent = Me objChild.Show() End Sub Private Sub MenuItem7_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MenuItem7.Click flagReader =
VB
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