find duplicate rows in datatable using linq vb net
Tài liệu Add and Delete Rows in a Dataset with ADO.NET pdf
Ngày tải lên :
21/01/2014, 12:20
... customer in the list is displayed in the text boxes.
Comments
As you can see, adding and deleting a record does not take much more than editing and
updating a record using ADO .NET. Using the ... String
39.
40. If mblnAdd Then
41. mdrCustIndiv = mdsCustIndiv.Tables("Customers").NewRow
42. End If
43.
44. ' Start the editing in the datarow.
45. mdrCustIndiv.BeginEdit() ... create an Insert SQL command
81. modaCustIndiv.InsertCommand = ocbCustIndiv.GetInsertCommand
82. Else
83. ' Have the command builder create an update SQL command
84. modaCustIndiv.UpdateCommand...
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Tài liệu Finding, Filtering, and Sorting Rows in a DataTable ppt
Ngày tải lên :
14/12/2013, 13:15
... },
true
);
// 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 ... illustrates how to find, filter,
and sort DataRow objects
*/
using System;
using System.Data;
using System.Data.SqlClient;
class FindFilterAndSortDataRows
{
public static void Main()
{ ... " ;Using DataView Objects."
Listing 11.3
shows a program that finds, filters, and sorts DataRow objects.
Listing 11.3: FINDFILTERANDSORTDATAROWS.CS
/*
FindFilterAndSortDataRows.cs...
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Tài liệu Accessing Deleted Rows in a DataTable pptx
Ngày tải lên :
14/12/2013, 18:16
... DataViewRowState enumeration
Value Description
Added The Current version of all Added rows.
using System;
using System.Configuration;
using System.Text;
using System.Data;
using System.Data.SqlClient; ... and constants
using System;
using System.Configuration;
using System.Text;
using System.Data;
using System.Data.SqlClient;
private DataView dv;
Each DataRow has a RowState property ... Deleted rows.
The overloaded indexer in C#, or Item( ) property in VB. NET, is used to retrieve
the OrderID from the Original version of these deleted rows. This information is
displayed in the...
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Tài liệu Selecting the Top n Rows in a DataTable doc
Ngày tải lên :
14/12/2013, 18:16
... Namespaces, variables, and constants
using System;
using System.Configuration;
using System.Windows.Forms;
using System.Text;
using System.Data;
using System.Data.SqlClient;
private ... Freight 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, ... 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 outlined....
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Tài liệu Modifying Rows in a DataTable phần 1 ppt
Ngày tải lên :
24/12/2013, 01:17
... using the SetNull() method of a DataRow. You can
also check if a DataColumn contains null using the IsNull() method of a DataRow.
3. Use the Add() method through the Rows property of your DataTable ... the DataTable to
// create a new DataRow
Console.WriteLine("Calling myDataTable.NewRow()");
DataRow myNewDataRow = myDataTable.NewRow();
Console.WriteLine("myNewDataRow.RowState ...
columns in the database.
Next, the following example sets the InsertCommand property of mySqlDataAdapter to
myInsertCommand:
mySqlDataAdapter.InsertCommand = myInsertCommand;
Setting the...
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Tài liệu Modifying Rows in a DataTable phần 2 docx
Ngày tải lên :
24/12/2013, 01:17
... your DataTable. You need to set this to find the
DataRow in the next step.
2. Use the Find( ) method to locate the DataRow that you want to modify in your
DataTable. You locate the DataRow using ... 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");
// ... of rows affected by the method
call. In this example, one is returned since one row was added.
Modifying a DataRow in a DataTable
To modify a DataRow in a DataTable, you use the following...
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Tài liệu Finding Rows in a DataTable ppt
Ngày tải lên :
26/01/2014, 10:20
... them in the table using the Find( ) method of the
// DataRowCollection for the DataTable.
int findCount = 0;
foreach(DataRow row in drc)
{
DataRow foundRow = dt .Rows .Find( row[ORDERID_FIELD]); ... != null)
findCount++;
}
resultTextBox.Text += " ;DataTable .Rows .Find returned " + findCount +
" record(s)." + Environment.NewLine;
// Locate records using the RowFilter ... " ;DataTable. Select returned " + drc.Length +
" record(s)." + Environment.NewLine;
// Iterate over the collection of rows filtered in the previous step
// and find them in...
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Using LINQ to DataSet
Ngày tải lên :
03/10/2013, 00:20
... for 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 ... Chapter 18 Using LINQ to DataSet
309
with data from external sources, you must bring any data you plan to include in a LINQ
query into the relevant DataTable instances before passing the objects ... IQueryable(Of T) interface.
The LINQ to DataSet provider endows ordinary ADO .NET DataTable objects with the ability
to participate fully in LINQ queries. It does this by adding the necessary LINQ requirements...
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Using LINQ to Entities
Ngày tải lên :
03/10/2013, 00:20
... Using LINQ to DataSet,”
combined LINQ to Objects and LINQ to DataSet content LINQ to Entities imposes restric-
tions on the type of data involved in the queries.
Note
One of the exercises in this ... demonstrate one way that LINQ to Entities can be
used indirectly with other forms of LINQ.
Some LINQ features available with other LINQ providers are not supported by LINQ to
Entities. Projections, ... the standard LINQ clauses are included, in both their LINQ expression and their
extension method/lambda expression forms, including Where, Join, Group By, and so on.
As far as the LINQ syntax...
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Using LINQ to SQL
Ngày tải lên :
03/10/2013, 00:20
...
the first LINQ to Entities query included in Chapter 19, Using LINQ to Entities.”
Like its Entity Framework complement, LINQ to SQL uses the clauses in the query (in either
the standard LINQ form ... DataContext instance that contains the function.
Call the function within a LINQ query.
Dwonloaded from: iDATA.ws
Chapter 20 Using LINQ to SQL
335
C#
using (SalesOrderLink context = new SalesOrderLink(connectionString))
{
... use the LINQ to SQL provider
Understand how LINQ to SQL prepares queries for processing
Determine when to use LINQ to SQL over LINQ to Entities
LINQ is an extensible system, enabling a consistent...
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Tài liệu VB .NET Language in a Nutshell pdf
Ngày tải lên :
09/12/2013, 17:15
... the other hand, we find this
somewhat irritating, because we have invested so much time and effort in learning and using COM.
Finally, we find this change somewhat frightening; who knows what ... major Office applications. However, VBA is not the
programming language for VB .NET. Indeed, until VB .NET is incorporated into a release of
Microsoft Office for .NET, the two languages will differ ...
2.4.4 Arrays in VB .NET 65
2.5 Object Variables and Their Binding 67
2.5.1 Late Binding Versus Early Binding 68
2.6 The Collection Object 69
2.7 Parameters and Arguments 70
2.7.1 Passing Arguments...
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Tài liệu Finding Rows in a DataView doc
Ngày tải lên :
14/12/2013, 18:16
... 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( ) ... and FindRows( ) methods take a single input argument. This is an object
value if the DataView is sorted on a single column or an array of objects containing
values for all of the columns defined...
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Tài liệu Hướng dẫn lập trình VB.NET Chương 18: Làm việc với máy in pdf
Ngày tải lên :
22/12/2013, 20:17
... thì có thể vừa 1 dòng in
e.Graphics.MeasureString(StringToPrint, PrintFont, _
kichthuoc, chuoidinhdang, sokytu, sodong)
chuoiin = StringToPrint.Substring(0, sokytu)
&apos ;In chu
ỗi trên trang ... Brushes.Black, vungin, chuoidinhdang)
'N
ếu vẫn còn chuỗi để in
If sokytu < StringToPrint.Length Then
'Lo
ại bỏ chuỗi đã in xong
StringToPrint = StringToPrint.Substring(sokytu)
e.HasMorePages ... Private PrintPageSetting As New PageSettings()
Private StringToPrint As String
Private PrintFont As New Font("Arial", 10)
Các biến này dùng khi in trang, biến PrintPageSetting để thiết...
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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
... ordersDA.Update(newOrdersDRArray);
Console.WriteLine("numOfRows = "+ numOfRows);
// push the modified rows in customersDT to the database
Console.WriteLine("Pushing modified rows in customersDT to database"); ... "", DataViewRowState.Added);
int numOfRows = customersDA.Update(newCustomersDRArray);
Console.WriteLine("numOfRows = " + numOfRows);
// push the new rows in ordersDT to the ... the DataRow objects in newCustomersDRArray to the Customers
table in the database using the following call to the Update() method of the customersDA
DataAdapter:
int numOfRows = customersDA.Update(newCustomersDRArray);...
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Tài liệu Build Your Own ASP.NET 3.5 Web Site Using C# & VB, 3rd Edition docx
Ngày tải lên :
14/02/2014, 10:20
... later in the book. Click Next.
Build Your Own ASP .NET 3.5 Web Site Using C# & VB (www.sitepoint.com)
18 Build Your Own ASP .NET 3.5 Web Site Using C# & VB
If you’re using VB. NET, you’ll ... 1.11. Enabling script debugging in Internet Explorer
Build Your Own ASP .NET 3.5 Web Site Using C# & VB (www.sitepoint.com)
iv
Build Your Own ASP .NET 3.5 Web Site Using C# & VB
by Cristian ...
Build Your Own ASP .NET 3.5 Web Site Using C# & VB (www.sitepoint.com)
16 Build Your Own ASP .NET 3.5 Web Site Using C# & VB
arate files—named code-behind files—for storing this code. The...
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