select distinct rows from datatable using linq vb net

Ngày tải lên: 14/03/2014, 23:20

... 5.1 Copying Rows from One DataTable to Another Problem You have records in a DataTable that you need to copy to another DataTable. Solution Use the ImportRow( ) method of the DataTable to ... of the DataTable using the row index. • Use the Select( ) method of the DataTable. • Use the RowFilter property of a DataView for the DataTable. The sample code creates a source DataTable ... DataRow objects from one DataTable to another. Three techniques for selecting records to copy are demonstrated in the following example: • Use the Rows property to access rows in the DataRowCollection...

Ngày tải lên: 28/10/2013, 18:15

... SqlDataAdapter(); mySqlDataAdapter.SelectCommand = mySelectCommand; The SELECT statement is then run when you call the mySqlDataAdapter object's Fill() method to retrieve rows from the Products table ... DataAdapter. Using Stored Procedures to Add, Modify, and Remove Rows from the Database You can get a DataAdapter object to call stored procedures to add, modify, and remove rows from the database. ... object containing a SELECT statement and sets the SelectCommand property of a SqlDataAdapter to that SqlCommand: SqlCommand mySelectCommand = mySqlConnection.CreateCommand(); mySelectCommand.CommandText...

Ngày tải lên: 14/12/2013, 13:15

... Calling myDataTable.NewRow() myNewDataRow.RowState = Detached Calling myDataTable .Rows. Add() myNewDataRow.RowState = Added Calling mySqlDataAdapter.Update() numOfRows = 1 myNewDataRow.RowState ... the Add() method through the Rows property // to add the new DataRow to the DataTable Console.WriteLine("Calling myDataTable .Rows. Add()"); myDataTable .Rows. Add(myNewDataRow); Console.WriteLine("myNewDataRow.RowState ... int numOfRows = mySqlDataAdapter.Update(myDataTable); mySqlConnection.Close(); Console.WriteLine("numOfRows = " + numOfRows); Console.WriteLine("myRemoveDataRow.RowState...

Ngày tải lên: 14/12/2013, 13:15

... 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 the DataTable ... and shows you how to employ them to extract data from data sets using the power of LINQ. Understanding the LINQ to DataSet Provider ADO .NET s DataTable class, as a logical collection of data-laden ... and performs a projection of fields from each source table. Dwonloaded from: iDATA.ws Chapter 18 Using LINQ to DataSet 307 C# // Explicit join. var results = from cu in Customer.AsEnumerable() ...

Ngày tải lên: 03/10/2013, 00:20

... remotely run SQL statement. While other LINQ providers can be mixed—Chapter 18, Using LINQ to DataSet,” combined LINQ to Objects and LINQ to DataSet content LINQ to Entities imposes restric- tions ... Queries with LINQ to Entities As with all LINQ providers, the general structure of LINQ to Entities queries varies only a little from the LINQ to Objects standard. In fact, looking at a LINQ to Entities ... array. The result2 query is actually doing its work using LINQ to Objects. Dwonloaded from: iDATA.ws Dwonloaded from: iDATA.ws Chapter 19 Using LINQ to Entities 323  Math and statistical functions...

Ngày tải lên: 03/10/2013, 00:20

... platform. LINQ to DataSet and LINQ to Entities both allow you to build LINQ queries that interact with data sourced from SQL Server, either directly (LINQ to Entities) or indirectly (LINQ to ... chapter. Dwonloaded from: iDATA.ws Chapter 20 Using LINQ to SQL 333 Using LINQ to SQL, especially when building models with its visual designer, is straightforward and often much quicker than setting up a LINQ ... function within a LINQ query. Dwonloaded from: iDATA.ws Chapter 20 Using LINQ to SQL 335 C# using (SalesOrderLink context = new SalesOrderLink(connectionString)) { var results = from cu in context.Customers ...

Ngày tải lên: 03/10/2013, 00:20

... either at design time using the property sheet, or at runtime using code. Exporting Using the Report Document When you're exporting using the Report document, you will be using the ExportOptions ... btnExport.Click Dim strExt As String Try With Me.rdHowTo10_4.ExportOptions Select Case lstExportType.SelectedItem The PrintOptions object, found on the ReportDocument, is very useful. ... when you're using tools such as the Viewer in a tabbed form, the tab pages can become cluttered. If you want to limit the power of the Viewer or make it more 10.4 Select Whether the...

Ngày tải lên: 20/10/2013, 13:15

... get the column values from your DataReader. Let's take a look at some code that uses the GetOrdinal() method to obtain the positions of the columns from the example SELECT statement: int ... performance and flexibility. Warning When you've finished reading the rows from your DataReader object, close it using the Close() method. The reason for this is that a DataReader object ... Listing 9.1: USINGCOLUMNORDINALS.CS /* UsingColumnOrdinals.cs illustrates how to use the GetOrdinal() method of a DataReader object to get the numeric positions of a column */ using System;...

Ngày tải lên: 21/01/2014, 07:20

... 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 need to generate ... Fig- ure 1.16. Build Your Own ASP .NET 3.5 Web Site Using C# & VB (www.sitepoint.com) 2 Build Your Own ASP .NET 3.5 Web Site Using C# & VB What is ASP .NET? ASP .NET is a sophisticated and powerful ... you’re using C# is completely different from the one it generates when you’re using VB. NET. They’re based on the same platform and use the same data types and features, so C# and VB. NET are...

Ngày tải lên: 14/02/2014, 10:20

... performance. Next, we did experiments using all of the continuous lexical sequences and using all of the POS tags sequences within a radius of n words from each CK as features (n=1,2,3,4,5). ... of EMNLP’03. Seon Yang and Youngjoong Ko. 2009. Extracting Comparative Sentences from Korean Text Documents Using Comparative Lexical Patterns and Machine Learning Techniques. In Proceedings ... each probability value of all CE-candidates using SVM. For example, if a sentence has three “P”s, one “P” with the highest probability value is selected as the answer PR. 5 Experimental Evaluation...

Ngày tải lên: 20/02/2014, 04:20

... example, the candidate terms (NATIONAL NETWORK, REGIONAL NETWORK, DIS- PATCHING NETWORK) give the context (NATIONAL, REGIONAL, DISPATCHING) for the noun NETWORK. If we suppose that the modifiers ... obtained from the two different data sets. 4 The conceptual analysis : the LEXICLASS software LEXICLASS is a clustering tool written using C lan- guage and specialised data analysis functions from ... (e.g. REGIONAL NETWORK is extracted by LEXTER), and a '0' otherwise ("national line" is not extracted by LEXTER). NATIONAL DISPATCHING REGIONAL LINE 0 1 0 NETWORK 1 1...

Ngày tải lên: 22/02/2014, 03:20

... Performance and Maintenance first if you are using Windows XP). Once the Admin- istrative Tools are open, select Internet Information Services. If you do not see Internet Information Services within the ... . . . . . . . . . . . . . xvii ■CHAPTER 1 An Introduction to .NET and Visual Studio 2005 . . . . . . . . . . . 1 VB. NET and ASP .NET. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ... 3:15 AM Page vii 5386fm_final.qxd 8/18/05 3:15 AM Page vi Beginning Object-Oriented ASP .NET 2.0 with VB. NET From Novice to Professional Brian R. Myers 5386fm_final.qxd 8/18/05 3:15 AM Page i corner...

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