... â Start
Without Debugging. Figure 9.4
shows the running form.
Figure 9.4: The running form
Using a DataReader Object in VisualStudio .NET
You can't visually create a DataReader ... DataReader object in VisualStudio .NET (VS .NET) ; you can
only create them using program statements.
In this section, you'll see how to create a SqlDataReader object and use it to retrieve ... object. For my
installation of SQL Server, the password to access the Northwind database is sa, and my
ConnectionString property is set to:
data source=localhost;initial catalog=Northwind;persist...
... experiment with the Server Explorer-that's the best way to
learn.
Once you've connected to the database, you can view things such as the tables. You can
also retrieve and modify ... clicking the Show Diagram button in the
toolbar and selecting columns from the table, as shown in Figure 3.29
. As you can see,
I've selected the ContactName, CompanyName, and CustomerID columns ...
You can enter SQL statements by clicking the Show SQL Pane button in the toolbar, as
shown in Figure 3.28
.
Figure 3.28: Entering a SQL statement
You can build SQL statements visually by...
...
Creating a Command Object Using VisualStudio .NET
To create a SqlCommand object using VisualStudio .NET (VS .NET) , you drag a
SqlCommand object from the Data tab of the Toolbox ... named MyDataReader containing aWindows application.
2. Add a SqlConnection object to your project (refer back to the previous chapter
to
see how to add a SqlConnection object using VS .NET) . ... will have the
default name of sqlConnection1.
3. Configure your sqlConnection1 object to access your Northwind database.
Drag a SqlCommand object to your form. Figure 8.1
shows a form with a...
... details are correct.
At this point, you've entered all the mandatory details, and you can choose to save your
details by clicking OK, or you can click Advanced to enter additional details ... You'll recall that a SqlConnection
object allows you to connect to a SQL Server database. You can also drag an
OleDbConnection object from the Toolbox to your form to connect to a database ...
Creating a Connection Object Using VisualStudio .NET
To create a SqlConnection object using VisualStudio .NET, you drag a SqlConnection
object from the Data tab of the Toolbox...
...
create a SqlDataAdapter object by dragging a SqlDataAdapter object from the Data tab of
the Toolbox to your form. When you drag a SqlDataAdapter object to your form, you
start the Data Adapter ...
Creating a DataAdapter Object Using VisualStudio .NET
In this section, you'll learn how to create a DataAdapter using VisualStudio .NET.
N
ote You'll find a completed VS .NET ... Configure Data Adapter This link allows you to re-enter the Wizard to configure
your DataAdapter.
ã Generate Dataset This link allows you to generate a DataSet object using the
information set...
... .NET 27
Dim AppPath As String
Dim Pos As Integer
' Fetch full pathname of the EXE file
AppPath = System.Reflection.Assembly.GetExecutingAssembly.Location
' Locate the last slash ... Timer1_Tick(ByVal sender As Object, ByVal e As System.EventArgs) Handles
Timer1.Tick
' Display Date and Time every half a second
Label3.Text = DateTime.Now.ToLongDateString & " " & ... ngh a cho ta biết về dữ kiện. Thí dụ XML
Schema c a một XML file là metadata cắt ngh a về data structure c a
data trong XML file. Chính cái XML Schema cũng là một XML file. Các
.NET application...
... Microsoft .NET 13
Bài 2
Visual Studio. NET
Visual Studio. NET
Để chạy VisualStudio .NET bạn cần phải Set Time c aWindows lại trước
cuối tháng 7, 2001, eg: 1-July-2001.
Visual Studio. NET Beta 2 hiện nay ... TStr As String
ListBox2.Items.Clear() ' Clear Listbox2
' Use a StreamReader to open the UTF-8 file to read.
sr = New StreamReader(AppPath & "animals.txt")
' Read ... trình. Sau đó ta có thể viết:
AppPath = VB6.Left(AppPath, Pos)
Nguyên program chúng ta tại đây là Public Class Form1. Form1 th a kế
standard form class c a .NET Framework nên ta declare:
Inherits...
... loại cache database nho nhỏ (gọi là disconnected database) để
thay thế ADO. Thay vì application connects vĩnh viễn với database mẹ qua ADO,
application trong .NET làm việc với portable database ... từ database mẹ. Khi nào cần, portable database nầy (ADO .NET) sẽ được
reconciled với 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 rất dễ dàng
và nhẹ ký.
XML được yểm trợ tối a. Nằm ph a sau ADO .NET là XML. XML có thể là Table...
... trình. Sau đó ta có thể viết:
AppPath = VB6.Left(AppPath, Pos)
Nguyên program chúng ta tại đây là Public Class Form1. Form1 th a kế
standard form class c a .NET Framework nên ta declare: ... phải Set Time c aWindows lại trước cuối
tháng 7, 2001, eg: 1-July-2001.
Visual Studio. NET Beta 2 hiện nay có Service Pak 2, nó cho phép ta dùng Visual
Studio. NET Beta 2 sau ngày 31-July-2001, ... kế ta có thể edit các List items c a một Listbox bằng cách mở
property Items Collection ra và Edit vào một trang.
Bài 2
Visual Studio. NET
Visual Studio. NET
Để chạy VisualStudio.NET...
... Studio. NET
.NET Framework & Visual Studio. NET
NET Framework Base Class Library
NET Framework Base Class Library
Common Language Specification
Common Language Specification
ADO .NET: Data and XML
ADO .NET: ... học Khoa Học Tự Nhiên
Đại học Khoa Học Tự Nhiên
.NET Framework & Visual Studio. NET
.NET Framework & Visual Studio. NET
NET Framework Base Class Library
NET Framework Base Class Library
Common ... Framework & Visual Studio. NET
NET Framework Base Class Library
NET Framework Base Class Library
Common Language Specification
Common Language Specification
Common Language Runtime
Common Language...
... information on the Internet about
.NET; the links are as follows:
ã
Get Started Open the Start page.
ã
What's New View any updates for VS .NET or Windows. You can also view
upcoming training ... step 5: create a SqlDataReader object and call the ExecuteReader()
// method of the SqlCommand object to run the SELECT statement
SqlDataReader mySqlDataReader = mySqlCommand.ExecuteReader(); ... Online Search the MSDN Online Library for technical material such as
published articles on .NET.
ã
Downloads Download trial applications and example programs from the Web
sites featured here....
... directly instead of from a database, a
strongly typed dataset will have better performance when loading that XML than a
regular dataset. That's because a regular dataset has to shred the XML ... store data in a disconnected fashion. In
this chapter, you will use a strongly typed dataset-that is, a dataset with data rows that
match the name and datatypes of the columns. You will learn ... ' add all of the parameters for the update command. I have included only
' two parameters in this text.
You should always take a look at any code that is generated automatically...