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cmd->Connection = connection; cmd->Transaction = transaction; cmd->CommandType = CommandType::StoredProcedure; cmd->CommandText = "InsertAuthor"; cmd->Parameters->Add(gcnew SqlParameter("@LastName", SqlDbType::Char,32)); cmd->Parameters->Add(gcnew SqlParameter("@FirstName",SqlDbType::Char,32)); cmd->Parameters["@LastName"]->Value = "Dope"; cmd->Parameters["@FirstName"]->Value = "John"; int affected = cmd->ExecuteNonQuery(); if (affected <= 0) throw gcnew Exception("Insert Failed"); Console::WriteLine("Insert - {0} rows are affected", affected); cmd->CommandType = CommandType::Text; cmd->CommandText = "UPDATE Authors SET LastName = 'Doe'" "WHERE LastName = 'Dope'"; affected = cmd->ExecuteNonQuery(); if (affected <= 0) throw gcnew Exception("Insert Failed"); Console::WriteLine("Update - {0} rows are affected", affected); // This transaction will return 0 affected rows // because "Does" does not exist. // Thus, the if condition throws an execption which causes all // Transactions to be rolled back. cmd->CommandType = CommandType::Text; cmd->CommandText = "DELETE FROM Authors WHERE LastName = 'Does'"; affected = cmd->ExecuteNonQuery(); if (affected <= 0) throw gcnew Exception("Insert Failed"); Console::WriteLine("Delete - {0} rows are affected", affected); transaction->Commit(); } catch (Exception ^e) { transaction->Rollback("AuthorTransaction"); Console::WriteLine("Transaction Not completed"); Console::WriteLine("SQL error occurred: {0}", e->Message); } finally { connection->Close(); } } vb.net qr code scanner VB . NET QR Code Barcode Scanner DLL - Scan ... - BarcodeLib.com
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NET developers solve this problem, RasterEdge designs this powerful and multi- functional barcode reading and scanning SDK. Using this VB . NET QR Code ... namespace QuickReturns.StockTrading.ExchangeService.Hosts { class Program { static void Main(string[] args) { Type serviceType = typeof(TradeService); ServiceHost host = new ServiceHost(serviceType); host.Open(); Console.WriteLine("Service started: Press Return to exit"); Console.ReadLine(); } } } Listing 3-9 provides the App.config file of the service. You can find the TradeService defined with its endpoints. Please note the IMetadataExchange endpoint. You specify this endpoint in order to allow consumers to retrieve the metadata (WSDL) of the service. If you want to use either SvcUtil.exe or Add Service Reference in Visual Studio, you need to enable the retrieval of metadata. The service is referring to a specific behaviorConfiguration called serviceTypeBehaviors that sets some service-wide settings too. The service-wide settings are as follows: serviceMetadata: This allows you to set whether metadata may be retrieved for the service. You can set some additional attributes such as ExternalMetadataLocation, HttpEnabled, HttpsEnabled, HttpGetUrl, HttpsGetUrl, and MetaDataExporter. These are self-explanatory; please refer to the MSDN Help for more information. serviceDebug: These settings allow you to express whether you want to leak specific service exception information and helpful HTML information pages for your services across the service boundary. This should be disabled in production scenarios but can be helpful during development. You can set some additional attributes such as HttpHelpPageEnabled, HttpHelpPageUrl, HttpsHelpPageEnabled, HttpsHelpPageUrl, and IncludeExceptionDetailInFaults. These are self-explanatory; please refer to the MSDN Help for more information. We have set httpGetEnabled for the metadata and httpHelpPageEnabled and includeExceptionDetailInFaults because we need these in the remaining part of this section and the following section. vb.net qr code reader free VB . NET QR Code Barcode Scanner DLL - Scan ... - BarcodeLib.com
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This code in VB . NET shows how to decode QR code with this how to tutorial ... Free trial version of ByteScout BarCode Reader SDK is available on our website. Specifies that locks are held while the data is read, but changes to the data can occur before the transaction is committed Specifies that changes can occur even while the data is being read Specifies that locks are held on the data until the transaction is committed, but additional rows can be added or deleted Specifies that locks are held on the entire database until the transaction is committed Now that you have a transaction set, you need to assign it to the SqlCommand class s property Transaction: cmd->Transaction = transaction; The last set of transactional database updates is to execute all the transactions. If everything completes successfully, then execute the SqlTransaction class s Commit() method: transaction->Commit(); If, on the other hand, an error occurs, you would then execute the SqlTransaction class s Rollback() method: transaction->Rollback("AuthorTransaction"); Figure 12-14 shows the results of the preceding example program failing because the name of the author was not found in the database. vb.net qr code reader NET QR Code Barcode Reader - KeepAutomation.com
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