find duplicate rows in datatable using linq c
Tài liệu Finding, Filtering, and Sorting Rows in a DataTable ppt
Ngày tải lên :
14/12/2013, 13:15
... objects.
Listing 11.3: FINDFILTERANDSORTDATAROWS.CS
/*
FindFilterAndSortDataRows.cs illustrates how to find, filter,
and sort DataRow objects
*/
using System;
using System.Data;
using ... // find product with ProductID of 3 using the Find( ) method
// to locate the DataRow using its primary key value
Console.WriteLine(" ;Using the Find( ) method to locate DataRow object " ... "ProductID DESC",
DataViewRowState.OriginalRows);
foreach (DataRow myDataRow in productDataRows)
{
foreach (DataColumn myDataColumn in productsDataTable.Columns)
{
Console.WriteLine(myDataColumn...
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Tài liệu Accessing Deleted Rows in a DataTable pptx
Ngày tải lên :
14/12/2013, 18:16
... been changed since it was loaded or since
AcceptChanges( ) was last called.
When AcceptChanges( ) is called on the DataSet, DataTable, or DataRow, either
explicitly or implicitly by calling ... the sample by creating a DataTable containing Orders data from
Northwind. A view containing the Current rows is bound to a data grid on the
form.
Current Rows RadioButton.CheckedChanged
Sets ... the sample by creating a DataTable containing Orders data from
Northwind. A view containing the Current rows is bound to a data grid on the
form.
Current Rows RadioButton.CheckedChanged
Sets...
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Tài liệu Selecting the Top n Rows in a DataTable doc
Ngày tải lên :
14/12/2013, 18:16
... System.Configuration;
using System.Windows.Forms;
using System.Text;
using System.Data;
using System.Data.SqlClient;
private DataView dv;
// Table name constants
private const String ... columns, this
can be used in the initial data view filter to limit returned records in cases where there
might be duplicate values in the nth record. This would be used instead of the technique
just ... 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 on the
values in one...
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Tài liệu Modifying Rows in a DataTable phần 1 ppt
Ngày tải lên :
24/12/2013, 01:17
...
Concurrency
Concurrency determines how multiple users' modifications to the same row are handled.
There are two types of concurrency that apply to a DataSet:
•
Optimistic Concurrency ... concurrency, you can
always modify a row-and your changes overwrite anyone else's changes. You
typically want to avoid using "last one wins" concurrency.
To use optimistic concurrency, ... Customers, which contains the
rows retrieved by the following SELECT statement set earlier in the SelectCommand
property of mySqlDataAdapter:
SELECT CustomerID, CompanyName, Address
FROM Customers...
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Tài liệu Modifying Rows in a DataTable phần 2 docx
Ngày tải lên :
24/12/2013, 01:17
...
mySqlConnection.Open();
int numOfRows = mySqlDataAdapter.Update(myDataTable);
mySqlConnection.Close();
Console.WriteLine("numOfRows = " + numOfRows);
Console.WriteLine("myNewDataRow.RowState ... explicitly include the Open() and
Close() calls so that you can see exactly what is going on.
Note In the ADO.NET disconnected model of data access, you should typically keep the
connection to ... myDataTable.Columns["CustomerID"]
};
// step 2: use the Find( ) method to locate the DataRow
// in the DataTable using the primary key value
DataRow myEditDataRow = myDataTable .Rows .Find( "J5COM");...
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Using LINQ to DataSet
Ngày tải lên :
03/10/2013, 00:20
... bringing ADO.NET data into
a LINQ query.
Dwonloaded from: iDATA.ws
Chapter 18 Using LINQ to DataSet
313
Chapter 18 Quick Reference
To Do This
Include a DataTable instance in a LINQ query Call ... disparate sources. You can mix LINQ to Objects and LINQ to DataSet
content in the same query simply by including each source in the From clause.
C#
// Build an ad hoc collection, although you could ... values contained in each DataRow instance exist as System.Object instances
and only indirectly express their true types through DataColumn definitions.
To overcome these deficiencies, the LINQ to...
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Using LINQ to Entities
Ngày tải lên :
03/10/2013, 00:20
... Basic
Using context As New SalesOrderEntities(connectionString)
Dim results = From cu In context.Customers
Order By cu.FullName
Select CustomerID = cu.ID, CustomerName = cu.FullName
End Using
Most ... equivalents.
String functions Various string and string-conversion functions from SQL Server can
be called from LINQ: Ascii, Char, CharIndex, Difference (a Soundex-related function),
IsDate, IsNumeric, NChar, ...
database-level functions you want to include in your query.
LINQ to Entities includes a set of canonical functions which are all hosted in the System.Data.
Objects.EntityFunctions class. These functions...
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Using LINQ to SQL
Ngày tải lên :
03/10/2013, 00:20
... iDATA.ws
Chapter 20 Using LINQ to SQL
335
C#
using (SalesOrderLink context = new SalesOrderLink(connectionString))
{
var results = from cu in context.Customers
orderby cu.FullName
select new { CustomerID ... Select cu.ID, cu.FullName, context.AgedInvoices(cu.ID, 90)
Order By cu.FullName
You can also call these functions directly, as long as a valid context exists.
C#
decimal pending = context.AgedInvoices(whichCustomer, ... context.AgedInvoices(whichCustomer, 90);
Visual Basic
Dim pending As Decimal = context.AgedInvoices(whichCustomer, 90)
Dwonloaded from: iDATA.ws
Chapter 20 Using LINQ to SQL
343
Summary
This chapter introduced...
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Stringing in the Key of C#
Ngày tải lên :
04/10/2013, 21:20
... of characters using
either the
foreach
control or the index operator
[]
. The following
StringToCharAccess
program demonstrates this technique:
// StringToCharAccess - access the characters in ... RemoveSpecialChars - remove every occurrence of the specified
// characters from the string
public static string RemoveSpecialChars(string sInput, char[] cTargets)
{
string sOutput = sInput;
for(;;)
{
// ... second call to
Substring(3)
creates a string consisting of
the characters starting at index 3 and continuing to the end of the string:
“cd,e”
. (It’s the
“+ 1”
that skips the comma.) The
Concat()
function...
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4-Tier Architecture in ASP.NET with C#
Ngày tải lên :
17/10/2013, 14:15
... Hide Code
using System;
using System.Data;
using System.Configuration;
using System.Web;
using System.Web.Security;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;
using ...
PersonBAL.cs. Write following code inside it.
- Hide Code
using System;
using System.Data;
using System.Configuration;
using System.Web;
using System.Web.Security;
using System.Web.UI;
using System.Web.UI.WebControls;
using ... in the object definition can be done without touching the entire Business Access
Layers
Let me explain you step-wise process of creatioin of 4-Tier architecture application.
In this application,...
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Tài liệu Computing for Numerical Methods Using Visual C++ docx
Ngày tải lên :
10/12/2013, 14:15
... parallel computing, wireless computing, and communication
with other electronic devices.
In performing scienti c computing, several properties for good programming help
in achieving efficient coding. ... processing, numerical, scienti c, and engineering. C+ +
is available in all computing platforms, including Windows, UNIX, Macintosh, and
operating systems for mainframe and minicomputers. C+ + ... at
www.wiley.com.
Wiley Bicentennial Logo: Richard J. Pacifico
Library of Congress Cataloging -in- Publication Data:
Salleh Shaharuddin, 1956-
Computing for numerical methods using Visual c+ + / by Shaharuddin Salleh,...
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Tài liệu Finding Rows in a DataView doc
Ngày tải lên :
14/12/2013, 18:16
... by nothing, or ASC for an ascending sort, or by DESC for
a descending sort. Use commas to separate multiple sort column names.
Both the Find( ) and FindRows( ) methods take a single input argument. ... between the Find( ) and FindRows( ) methods is that Find( )
returns the zero-based index of the first row that matches the search criteria (or -1 if no
match is found) while FindRows( ) returns ... Environment.NewLine);
}
result.Append("COUNT\t" + foundRows.Length +
Environment.NewLine);
}
resultTextBox.Text = result.ToString( );
}
Discussion
The Find( ) and FindRows( )...
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Tài liệu Adding, Updating, and Deleting Related Rows In this section, you''''ll learn how to make changes in docx
Ngày tải lên :
24/12/2013, 01:17
... SqlCommand objects previously created
customersDA.SelectCommand = customersSelectCommand;
customersDA.InsertCommand = customersInsertCommand;
customersDA.UpdateCommand = customersUpdateCommand; ... Orders";
// create a SqlCommand object to hold the INSERT
SqlCommand ordersInsertCommand = mySqlConnection.CreateCommand();
ordersInsertCommand.CommandText =
"INSERT INTO Orders (" ...
customersUpdateCommand.Parameters["@OldCompanyName"].SourceVersion =
DataRowVersion.Original;
// create a SqlCommand object to hold the DELETE
SqlCommand customersDeleteCommand = mySqlConnection.CreateCommand();
customersDeleteCommand.CommandText...
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Tài liệu Add and Delete Rows in a Dataset with ADO.NET pdf
Ngày tải lên :
21/01/2014, 12:20
... "Customers")
89. mdsCustIndiv.Tables("Customers").AcceptChanges()
90.
91. ' Close the connection
92. If mblnAdd Then
93. modaCustIndiv.InsertCommand.Connection.Close() ... following code to the Click event btnCancel.
105. Private Sub btnCancel_Click(ByVal sender As System.Object, _
106. ByVal e As System.EventArgs) Handles btnCancel.Click
107.
108.
' Cancel ... mdsCustIndiv.Tables("Customers").AcceptChanges()
138.
139. ' Close the connection
140. modaCustIndiv.DeleteCommand.Connection.Close()
141.
142. Catch excData As Exception
143. MessageBox.Show("Error...
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Bose einstein condensation in dilute gases pethick c j , smith h
Ngày tải lên :
24/01/2014, 17:30
... some
concepts basic to an understanding of Bose–Einstein condensation in dilute
gases see Ref. [19].
1.1 Bose–Einstein condensation in atomic clouds
Bosons are particles with integer spin. The ... gas, and lines used
as atomic clocks.
One of the characteristic features of a superfluid is its response to ro-
tation, in particular the occurrence of quantized vortices. We discuss in
Chapter ... interatomic interactions, structure of
trapped condensates, collective modes, rotating condensates, superfluidity,
interference phenomena and trapped Fermi gases. Problem sets are also
included in each chapter.
christopher...
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