find duplicate rows in datatable using linq c

... 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...

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.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");...

Ngày tải lên: 24/12/2013, 01:17

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Ngày tải lên: 30/03/2014, 03:20

... 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...

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

... 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...

Ngày tải lên: 04/10/2013, 21:20

... 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,...

Ngày tải lên: 17/10/2013, 14:15

Ngày tải lên: 25/10/2013, 19:20

... 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,...

Ngày tải lên: 10/12/2013, 14:15

... 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 ... Environment.NewLine); } result.Append("COUNT\t" + foundRows.Length + Environment.NewLine); } resultTextBox.Text = result.ToString( ); } Discussion The Find( ) and FindRows( )...

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

... "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...

Ngày tải lên: 21/01/2014, 12:20

... 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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