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As you ve seen, when you use the SqlDataSource, you can often avoid writing any data access code. However, you also sacrifice a fair bit of flexibility. Here are the most significant disadvantages: Data access logic embedded in the page: To create a SqlDataSource control, you need to hardcode the SQL statements in your web page. This means you can t fine-tune your query without modifying your web page. In an enterprise application, this limitation isn t acceptable, as it s common to revise the queries after the application is deployed in response to profiling, indexes, and expected loads.

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View How to generate barcode in C# .NET using ASP.NET. Users can also paint and draw high-quality QR Code barcodes in .NET Windows Forms applications. You can directly drag the barcoding control to a Windows Form and get a QR Code image or create barcodes with Visual C# programming.

Here s an example: UpdateCommand="UPDATE Employees SET FirstName=@FirstName, LastName=@LastName, Title=@Title, City=@City FROM Employees WHERE EmployeeID=@original_EmployeeID"> This problem has another workaround The @original_ naming convention is configurable You can use a different prefix by changing the SqlDataSourceOldValuesParameterFormatString property This property takes a string of the form @original_{0}, where {0} indicates the unadulterated name If you are sure that your key values are read-only and won t be modified in an update operation, you have no reason to use this convention, because there s no difference between the original name and the current name So, simply change the OldValuesParameterFormatString property to {0}, and your commands will continue to work with the unmodified field names..

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May 14, 2012 · Create a QR Code With a Custom Logo Inside using ASP.Net C# ... I show you how to create ...Duration: 10:18 Posted: May 14, 2012

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If you create this extension as a class library project, you ll need to add a reference to the System.Web.dll assembly, which contains the bulk of the ASP.NET classes. Without this reference, you won t be able to use types such as IHttpHandler and HttpContext. (To add the reference, right-click the project name in the Solution Explorer, choose Add Reference, and find the assembly in the list in the .NET tab.)

You can improve this situation a fair bit by restricting your use of the SqlDataSource to stored procedures. However, in a large-scale web application, the data access code will be maintained, tested, and refined separately from the business logic (and it may even be coded by different developers). The SqlDataSource just doesn t give you that level of flexibility.

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Nov 1, 2017 · In this article you will learn how to generate QR Code in C#.

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The update command in the previous example matches the record based on its ID. The problem with this approach is that the update command updates every field indiscriminately it has no way to distinguish between fields that are and aren t changed. As a result, you can end up obliterating the changes of another user, if they are made between the time the page is requested and the time the page is updated. For example, imagine Chen and Lucy are viewing the same table of employee records. Lucy commits a change to the address of an employee. A few seconds later, Chen commits a name change to the same employee record. However, that update command not only applies the new name, but

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10 Jul 2018 ... Become more proficient with the functionalities of the QR (Quick Response) Code library that works with ASP.NET MVC applications.

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