find duplicate rows in datatable using linq c
Tài liệu Finding, Filtering, and Sorting Rows in a DataTable ppt
... 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
... 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
... 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
... 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
... 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
... bringing ADO.NET data into a LINQ query.Dwonloaded from: iDATA.ws Chapter 18 Using LINQ to DataSet 313Chapter 18 Quick ReferenceTo Do ThisInclude 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
... Basic Using context As New SalesOrderEntities(connectionString) Dim results = From cu In context.Customers Order By cu.FullName Select CustomerID = cu.ID, CustomerName = cu.FullNameEnd 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
... 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.FullNameYou can also call these functions directly, as long as a valid context exists. C# decimal pending = context.AgedInvoices(whichCustomer, ... context.AgedInvoices(whichCustomer, 90);Visual BasicDim pending As Decimal = context.AgedInvoices(whichCustomer, 90)Dwonloaded from: iDATA.ws Chapter 20 Using LINQ to SQL 343SummaryThis chapter introduced...
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Stringing in the Key of C#
... of characters using either the foreachcontrol or the index operator []. The followingStringToCharAccessprogram demonstrates this technique:// StringToCharAccess - access the characters in ... RemoveSpecialChars - remove every occurrence of the specified// characters from the stringpublic static string RemoveSpecialChars(string sInput, char[] cTargets){string sOutput = sInput;for(;;){// ... second call to Substring(3)creates a string consisting ofthe 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#
... 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
... parallel computing, wireless computing, and communicationwith 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, andoperating systems for mainframe and minicomputers. C+ + ... atwww.wiley.com.Wiley Bicentennial Logo: Richard J. PacificoLibrary 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
... 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
... 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
... "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
... someconcepts basic to an understanding of Bose–Einstein condensation in dilutegases see Ref. [19].1.1 Bose–Einstein condensation in atomic cloudsBosons are particles with integer spin. The ... gas, and lines usedas 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 oftrapped condensates, collective modes, rotating condensates, superfluidity,interference phenomena and trapped Fermi gases. Problem sets are alsoincluded in each chapter.christopher...
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