... 103
6D
ATABASE
A
CCESS WITH
VB .NET
AND
ADO .NET 105
Accessing a Database from a Windows Application 106
Using the DataAdapter Configuration Wizard 107
ADO .NET 122
About ADO .NET 122
DataSets 122
Working ... application using VisualBasic 3.0. The application was a
data-entry form with a data control, some text boxes, and an OK button a simple
application that read and wrote data toa Microsoft Access ... you have been creating in VisualBasic for the past six
years, it is similar. Just as a standard COM DLL has a type library, the assembly has
a manifest that contains the metadata for the assembly,...
... can also have multiple Catch statements to catch various errors. To have one
Catch statement catch a particular error, you add a When clause to that Catch.
Examine this code:
Try
x \= y ‘ cause ... Page 5
The Variant Data Type Has Been Replaced
The Variant data type has been replaced. Before you start thinking that there is no
longer a catch-all variable type, understand that the Variant ... part written in C# (pronounced “C-Sharp”), or any other
language built to target the .NET Framework.
.NET supplies a standard security mechanism, available to all parts of your application.
.NET...
... Define a Class in VisualBasic .NET
Before writing code, you should take a moment to decide what data the class needs to
contain and what actions a developer (whether it is you or a teammate) ... the same interface in different
ways.
An interface cannot exist as an object: It has no code and no place to store object data. A
class that implements an interface has an explicit contract ...
You can also create properties that accept a parameter. For example, in the Northwind
database, a customer might have many orders. A parameterized property would be a
perfect way to access...
... frmSearch.ShowDialog() = DialogResult.OK Then
LoadIndividual(frmSearch.ResultValue)
8.4 Make a Generic Search Form in aVisualBasic .NET Desktop Application
Another useful utility that takes advantage ... ByVal e As System.EventArgs) Handles btnAccept.Click
Dim dtFromGrid As DataTable
Dim drCurr As DataRow
Try
' Using the DataRow and DataTable objects of the DataGrid control, ... frmHowTo8_ 4a. vb: Filling the Results Set Based on the Letter
Button That Was Pressed
Sub SetData(ByVal strFilterLetter As String)
Dim odaSearch As OleDb.OleDbDataAdapter
Dim dtSearch As DataTable...
... Button1_Click và thêm vào đoạn mã
như sau:
Const PI As Double = 3.14159265
Label1.Text = PI
8. Làm việc với to n tử trong VISUAL BASIC. NET
Visual Basic. NET cung cấp các to n tử cơ bản sau:
To n ... Dim Dc As Decimal
Dim B As Byte
Dim Ch As Char
Dim Str As String
Dim Bo As Boolean
Dim Da As Date
- Tạo thủ tục Form1_Load để thêm các mục chọn cho ListBox1 như sau:
ListBox1.Items.Add("Short")
... về sin c a góc n (n – radian)
Sqrt(n) Trả về căn bậc hai c a n
Tan(n) Trả về tang c a góc n (n – radian)
Biên soạn: Phạm Đức Lập - 12 - Add: cnt-44-dh, VIMARU
Hướng dẫn lập trình VB .NET Chương...
... thị biến c a dòng lệnh đang thực thi hay hàm đang
thực thi mà thôi.
Để xem to n bộ nội dung cac biến bạn có thể dùng c a sổ WATCH. Trong VB .NET, bạn có
thể mở một lúc tới 4 c a sổ WATCH. Để ... giá trị biến hay giá trị nhập vào c a textbox1.
Nhấn nút Step Into hay F11 để chuyển sang dòng lệnh tiếp theo.
Giờ bạn mở c a sổ Autos bằng cách chọn Debug | Windows | Autos. C a sổ này cho phép ... - Add: cnt-44-dh, VIMARU
Hướng dẫn lập trình VB .NET Chương 8: Debug trong chương trình vb .net
3. Theo dõi các biến bằng c a sổ WATCH
Bạn có thể theo dõi các biến bằng c a sổ Autos nhưng c a sổ...
... outer + 1 To UBound(DataArray)
If GreaterThan.Invoke( DataArray(outer), DataArray(inner)) Then
temp = DataArray(outer)
DataArray(outer) = DataArray(inner)
DataArray(inner) = temp
End If ... các database qua HTTP, ADO và CDO (Collaborative Data Objects),
.v.v
Data Tier: Thường là relational database như Microsoft SQL Server hay Oracle. Ngoài ra còn có Exchange hay
các database ... database mẹ để update các thay đổi. Hai tables trong ADO .NET có thể được related nhau
trong Master/Details relationship. Vì ADO .NET có ch a original data lẫn data mới nhất nên Rollback trong
ADO.NET...
... this:
can create a dedicated /home partition using LVM - and if I need more space I can
extend it.
In this example hda1, hda2, and hda3 are all physical volumes. We'll initialize hda3 as a
physical ... howto, lvm
The logical volume manager allows you to create and manage the storage of your
servers in a very useful manner; adding, removing, and resizing partitions on demand.
Getting started ... I've missed one you're familiar with please do let me know.
Closing Comments
If you're ready to make the jump to LVM and don't have a lot of space handy for
allocating to...
... realities are; that had already been done, and
was in fact an obvious commonplace in philosophy. The most general
and distinct finite realities are Nature and Mind. He takes these as pal-
pably ... religion, and found
in it all that was characteristic of reason,—unity, and harmony of oppo-
sites. Love, in fact, was the “analogue” of reason.
7
“Life,” again, was
treated as the supreme category ... makes
it unnecessary for him to have what afterwards appears as the discus-
sion of essence. The qualifications ascribed to Being are, as we noted,
taken directly from Kant. Hegel seems to have...
...
+ Điểm thuận lợi c aVisual Basic. Net:
-Visual Basic. Net hỗ trợ các cấu tử lớp, mang tính th a kế thực thi, tính a
thể cổ điển, và quá tử phương pháp.
-Visual Basic. Net cho phép các nhà ... mảng, các kiểu điểm danh và các kiểu lớp)
để nâng VisualBasic lên ngang tầm với kiến trúc .Net
Vì vậy, luận văn kết hợp ngôn nhữ lập trình Visual Basic. Net nhằm tạo nên
một giao diện thân thiện ... vọng c a các em học sinh.
2.
Mục đích c a đề tài
Xây dựng và quản lý HTBHBT h a học phần hidrocacbon d a vào phần
mềm quản lý Access và ngôn ngữ lập trình Visual Basic. Net nhằm nâng cao hiệu...
... in ASP .NET 1.0 needed to be upgraded to ASP .NET 1.1 in
order to take advantage of Visual Studio 2005.
CHAPTER 2 ■ INTRODUCTIONTOVISUAL STUDIO 2008
37
A disadvantage is that it can be ... situation was
when I had Visual Studio 6.0, Visual Studio .NET (2002), Visual Studio 2003, and Visual Studio 2005
installed on my laptop at the same time. What a pain!
Microsoft has helped alleviate ... Communication Foundation (WCF), ADO .NET Data Services, and Ajax. Let’s look at some of the
new features in Visual Studio 2008 that are particularly helpful to Silverlight application developers.
JavaScript...