remove duplicate rows in datatable c using linq

... "ProductID DESC", DataViewRowState.OriginalRows); foreach (DataRow myDataRow in productDataRows) { foreach (DataColumn myDataColumn in productsDataTable.Columns) { Console.WriteLine(myDataColumn ... 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 "...

Ngày tải lên: 14/12/2013, 13:15

... 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...

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...

Ngày tải lên: 14/12/2013, 18:16

... 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...

Ngày tải lên: 24/12/2013, 01:17

... mySqlConnection.Close(); Console.WriteLine("numOfRows = " + numOfRows); Console.WriteLine("myRemoveDataRow.RowState = " + myRemoveDataRow.RowState); } The output from RemoveDataRow() ... follows: In RemoveDataRow() Calling myRemoveDataRow.Delete() myRemoveDataRow.RowState = Deleted Calling mySqlDataAdapter.Update() numOfRows = 1 myRemoveDataRow.RowState = Detached Notice that ... mySqlConnection.Open(); int numOfRows = mySqlDataAdapter.Update(myDataTable); mySqlConnection.Close(); Console.WriteLine("numOfRows = " + numOfRows); Console.WriteLine("myNewDataRow.RowState...

Ngày tải lên: 24/12/2013, 01:17

Ngày tải lên: 26/01/2014, 10:20

Ngày tải lên: 20/06/2014, 08:20

Ngày tải lên: 10/07/2014, 23:20

Ngày tải lên: 11/08/2014, 12:21

Ngày tải lên: 13/08/2014, 13:20

... range of application, especially in human-computer interaction (HCI). Fig.6. Screen shot of HCM Museum introduction To demonstrate the use of speech in HCI we have combined speech recognition ... speech engines. Finally, we demonstrate a human-computer interaction software in T-Engine embedded system. I. INTRODUCTION In this paper, we are concerned with the combination of speech recognition ... SPEECH RECOGNITION IN T-ENGINE Fig.2. Speech recognition in T-Engine The UDA1342 audio codec in T-Engine provides a minimal sampling frequency (SF) of 44100Hz. This SF is really not necessary...

Ngày tải lên: 12/04/2013, 16:05

... Q5 ACTION PLAN MAKING A CHART OF THE ENERGY CONSUMPTION IN H .C. M. CITY ACTIVITIES All Ss .in each group should do their real assignement to be able to collect the own amounts of the city ... duty Completing the group’s duty 7 7 Having the creative combination’s Having the creative combination’s ideas ideas +1 +1 Having plenty of properly Having plenty of properly illustrated pictures illustrated ... without being applied for live society. • Interactive learning is impossible without pairworks and groupworks. And learning or teaching in the 21st century must always be put in the 4L situation...

Ngày tải lên: 22/07/2013, 01:27

Ngày tải lên: 05/09/2013, 09:08

... 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...

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...

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...

Ngày tải lên: 03/10/2013, 00:20

Ngày tải lên: 19/10/2013, 16:15

... facility for Random Lay and/or patch cord separation. Change from a cross-connect to an interconnect cabling arrangement. The unused cross-connect panels or modules are re-usable for other circuits ... less chance of coupling from parallel runs. Replace existing Category 6 patch panels with polymer Category 6 A staggered-socket patch panels. This increases the separation between outlets and minimises ... 10GBE Alien CrossTalk Mitigation 060625 Mitigation Techniques To Reduce Alien Crosstalk Noise In 10GBE Channels Using UTP Cabling These mitigation techniques are good installation practices that...

Ngày tải lên: 27/10/2013, 17:15

... 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 ... search for rows in a DataView using its sort key values. The search values must match the sort key values exactly to return a result; wild card matches are not possible. The primary difference...

Ngày tải lên: 14/12/2013, 18:16

... 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...

Ngày tải lên: 24/12/2013, 01:17