modifying rows in a datatable phần 2
Tài liệu Selecting the Top n Rows in a DataTable doc
Ngày tải lên :
14/12/2013, 18:16
... field in descending order; this places
[ Team LiB ]
Recipe 3.10 Selecting the Top n Rows in a DataTable
Problem
You want to create a grid that shows the t op five rows in a DataTable, based ...
values in one of the columns.
Solution
Use an appropriate sort order with a DataView filter.
The sample code contains two event handlers:
Form.Load
Sets up the sample by creating a DataTable ...
using System;
using System.Configuration;
using System.Windows.Forms;
using System.Text;
using System.Data;
using System.Data.SqlClient;
private DataView dv;
// Table name constants...
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Tài liệu Finding, Filtering, and Sorting Rows in a DataTable ppt
Ngày tải lên :
14/12/2013, 13:15
... orderDetailsDataTable .Rows. Find(orderDetails);
Filtering and Sorting DataRow Objects in a DataTable
To filter and sort the DataRow objects in a DataTable, you use the Select() method of
your DataTable. ... DESC",
DataViewRowState.OriginalRows);
foreach (DataRow myDataRow in productDataRows)
{
foreach (DataColumn myDataColumn in productsDataTable.Columns)
{
Console.WriteLine(myDataColumn ... Order Details DataTable
// to the OrderID and ProductID columns
DataTable orderDetailsDataTable = myDataSet.Tables["Order Details"];
orderDetailsDataTable.Constraints.Add(
"Primary...
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Tài liệu Using Stored Procedures to Add, Modify, and Remove Rows from the Database phần 2 doc
Ngày tải lên :
14/12/2013, 13:15
... table, and the
RowState of myNewDataRow changes to Unchanged.
Modifying a DataRow in a DataTable
The following method, named ModifyDataRow(), uses four steps to modify a DataRow
in a DataTable ... object.
Adding a DataRow to a DataTable
In this section, you'll learn how to add a DataRow to a DataTable. First, the following
code creates a DataSet object named myDataSet and populates it ... add a new row to a DataTable:
public static int AddDataRow(
DataTable myDataTable,
SqlDataAdapter mySqlDataAdapter,
SqlConnection mySqlConnection
)
{
Console.WriteLine("\nIn AddDataRow()");...
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Tài liệu Accessing Deleted Rows in a DataTable pptx
Ngày tải lên :
14/12/2013, 18:16
... the DataTable, use an overload of the Select( ) method of
the DataTable to return an array of deleted DataRow objects. The overload accepts an
argument having a DataViewRowState enumeration value. ... Deleted rows from the DataTable, use an overload of the Select( ) method of
the DataTable to return an array of deleted DataRow objects. The overload accepts an
argument having a DataViewRowState ...
ADO.NET manages the state of the rows while they are being modified. Rows are
assigned a state from the DataRowState enumeration described in Table 2- 4
.
Table 2- 4. DataRowState enumeration
Value...
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Tài liệu thẩm định dự án đầu tư - Phần 2
Ngày tải lên :
20/10/2013, 03:15
... 10/4/04 at 8 :21 : 32
Assumptions
Assumption: So luong can ho cho thue duoc Cell: B3
Normal distribution with parameters:
Mean 25 .00
Standard Dev. 1.00
Selected range is from -Infinity to +Infinity
Correlated ... +Infinity
Correlated with:
Gia cho thue can ho 1.00
Assumption: Gia cho thue ca n ho Ce ll: B2
Normal distribution with parameters:
Mean 150.00
Standard Dev. 10.00
Selected range is from -Infinity to +Infinity
Correlated ... thanh toán, có thể thanh toán ton bộ, thanh toán một
tai-lieu-tham-dinh-du-an-dau-tu 1/6 /20 04 Trang 44/ 81
tai-lieu-tham-dinh-du-an-dau-tu 1/6 /20 04 Trang 49/ 81
thể nh sau: . Do đó, rất đơn...
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Developing a Simple Windows Application phần 2
Ngày tải lên :
20/10/2013, 10:15
... programs. Because this class is static, you don't create an instance of this class,
and its members are always available within your form. When the Run() method is called,
your form waits ...
class itself is available.
Table 6.1
shows the access modifiers in decreasing order of availability: public is the
most accessible, and private the least.
Table 6.1: ACCESS MODIFIERS
ACCESS ... this means that they are accessible only in the Form1 class.
Access modifiers enable you to specify the degree to which a class member is available
outside the class. You can also use an access...
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Customizing a Network Using the Registry phần 2
Ngày tải lên :
07/11/2013, 08:15
... service are outlined in
Table 8.3
.
Table 8.3: W32Time Service Registry Values
Value name Data type Description Values
AvoidTimeSyncOnWan REG_DWORD Synchronize with a
computer that is at a
different ... window. The Advanced
TCP/IP Settings window will open. Go to the DNS tab and clear the Register this
connection's addresses in DNS checkbox.
In case you want to perform the same operation ... using the registry, open the
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\Tcpip\Parameters \In
terfaces key, and set the DisableDynamicUpdate value (of REG_DWORD data type) to
1.
Disabling...
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Tài liệu Using a SqlConnection Object to Connect to a SQL Server Database phần 2 doc
Ngày tải lên :
14/12/2013, 13:15
...
The InfoMessage Event
The InfoMessage event fires when the database returns a warning or information message
produced by the database. You use the InfoMessage event to monitor these messages. ...
/*
StateChange.cs illustrates how to use the StateChange event
*/
using System;
using System.Data;
using System.Data.SqlClient;
class StateChange
{
// define the StateChangeHandler() ... SqlConnection("server=localhost;database=Northwind;uid=sa;pwd=sa");
// monitor the StateChange event using the StateChangeHandler() method
mySqlConnection.StateChange +=
new StateChangeEventHandler(StateChangeHandler);...
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Tài liệu Adding restrictions to datatable and datacolumn objects phần 2 pptx
Ngày tải lên :
24/12/2013, 01:17
... following scenario that involves
primary keys:
1. You add a primary key constraint to a DataTable.
2. You retrieve a subset of the rows from a database table and store them in your
DataTable. ... a row in the database table. Your new
DataRow is added without any problem to the DataTable even though you added a
primary key constraint to your DataTable in step 1. Your new DataRow is added ... (DataTable myDataTable in myDataSet.Tables)
{
Console.WriteLine("\n\nReading from the " +
myDataTable + " ;DataTable: \n");
// display the primary key
foreach (DataColumn...
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BẢN ĐỒ CÁC QUẬN TRONG TP.HCM PHẦN 2
Ngày tải lên :
03/09/2013, 21:10
... ĐC
BN Đ CC QUN TRONG
TP.HCM
(tt)
QUN BNH THNH
QUN TÂN PH
QUN TÂN BNH
QUN 10
QUN 12
QUN 11
QUN PH NHUN
QUN 9
QUN 8
QUN
QUN
QUN BNH TÂN
...
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