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change to the same employee record. However, that update command not only applies the new name, but it also overwrites every field with the values in Chen s page effectively replacing the address Lucy entered with the old address. To defend against this sort of problem, you can enforce stricter concurrency checking. One way to do this is to create a command that performs the update only if every field matches. Here s what that command would look like: UpdateCommand="UPDATE Employees SET FirstName=@FirstName, LastName=@LastName, Title=@Title, City=@City FROM Employees WHERE EmployeeID=@original_EmployeeID AND FirstName=@original_FirstName AND LastName=@original_LastName AND Title=@original_Title AND City=@original_City"> The problem is that the command doesn t have access to the original values of every field instead, it has only the original value of any key fields. You could define every field in the table as a key field, but this is certain to cause confusion. A better solution is to set the SqlDataSource.ConflictDetection property to ConflictOptions.CompareAllValues instead of ConflictOptions.OverwriteChanges (the default). The data control will then supply the original value of every field, and the command will work as written. At the end of 10 you'll see an example that shows how you can implement a more sophisticated concurrency handling strategy that warns you when a change will conflict, and gives you the option of applying it or canceling it. c# gs1 128 Packages matching GS1-128 - NuGet Gallery
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EAN 128 Generator for .NET, C#, ASP.NET, VB.NET, Generates High Quality Barcode Images in .NET Projects. Commands that compare values are often inefficient, because they require more data to be sent over the network and mean more comparison work for the database. A better solution is to use a timestamp field. If the row is unchanged, the timestamp will always match. In this case, you would hide the timestamp column from the data control but set the DataKeyFields property to include it, so you could use it when constructing your command. To illustrate how this would work in practice, consider a field designed to store and retrieve a pickled copy of any arbitrary Python object. There s no way to know in advance how complicated the Python representation will be, so this is a situation where it s ideal to delay the construction of that object until it s actually necessary. microsoft word qr code font, word ean 13 barcode, birt ean 128, birt data matrix, word 2013 code 39, data matrix code word placement c# ean 128 reader C# GS1 128 (UCC/EAN 128) - OnBarcode
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C#.NET GS1-128 Generator for barcode prject developers to create barcode in C#.NET class, Data Matrix, PDF417, QR Code, Code128, Code39. The update example works just as readily with stored procedures. In this case, you simply supply the stored procedure name for the UpdateCommand: UpdateCommand="UpdateEmployee" UpdateCommandType="StoredProcedure" However, this has a catch. As you ve learned, the parameter names are based on the field names. If the stored procedure uses the same parameter names, the update works without a hitch. However, if the stored procedure parameter names are slightly different, the update will fail. The following variables are used by the shell, which may set a default value for some of them (for example, IFS): The order of parameters is irrelevant. Only the names are important. The SqlDataSource does a caseinsensitive comparison, so your parameters can have different capitalization. For example, consider an UpdateEmployee stored procedure that takes parameters like this: CREATE PROCEDURE UpdateEmployee @EmployeeID int, @TitleOfCourtesy varchar(25), @Last varchar(20), @First varchar(10) AS ... c# ean 128 reader Best 20 NuGet gs1-128 Packages - NuGet Must Haves Package
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Apr 22, 2018 · Decode EAN-128 with ByteScout Barcode Reader SDK https://bytescout.com/articles ...Duration: 0:58 Posted: Apr 22, 2018 In this example, the FirstName and LastName fields map to parameters named @First and @Last. Unfortunately, there s no declarative way to correct this problem and map these parameters to their correct names. Instead, you need to define the new parameters and write a little custom code. The first step is to add two parameters to the SqlDataSource.UpdateParameters collection. Unfortunately, you can t create these while the update is in progress. Instead, you need to add them to the SqlDataSource tag: <asp:SqlDataSource ID="sourceEmployees" runat="server" ProviderName="System.Data.SqlClient" ConnectionString="<%$ ConnectionStrings:Northwind %>" SelectCommand= "SELECT EmployeeID, FirstName, LastName, TitleOfCourtesy FROM Employees" UpdateCommand="UpdateEmployee" UpdateCommandType="StoredProcedure" OnUpdating="sourceEmployees_Updating" > <UpdateParameters> <asp:Parameter Name="First" Type="String" /> <asp:Parameter Name="Last" Type="String" /> </UpdateParameters> </asp:SqlDataSource> Note that the parameter names don t include the @ symbol when you define them in the SqlDataSource tag. The next step is to react to the SqlDataSource.Updating event, which fires immediately before the update is committed. You can then set the value for the @First and @Last parameters and remove the @FirstName and @LastName parameters from sight. Here s the code you need: protected void sourceEmployees_Updating(object sender, SqlDataSourceCommandEventArgs e) { e.Command.Parameters["@First"].Value = e.Command.Parameters["@FirstName"].Value; e.Command.Parameters["@Last"].Value = e.Command.Parameters["@LastName"].Value; e.Command.Parameters.Remove(e.Command.Parameters["@FirstName"]); e.Command.Parameters.Remove(e.Command.Parameters["@LastName"]); } This represents a fairly typical scenario in which the no-code data binding won t work. Overall, if you can design your stored procedures and classes to work with the data source controls, you ll avoid writing a great deal of code. On the other hand, if you introduce the data source controls to an existing application with a fixed database schema and database components, it may take a fair bit of extra code to fit these pieces together. c# ean 128 reader ilopez/GS1Parser: A GS1 Parser for C - GitHub
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