![]() ![]() Usually serves as a container for multiple existing controls with predefined layout.Can be reused only within the same application (unless packaged and distributed).Easier to develop because it uses a visual designer. ![]() Derives from the .UserControl base class.Developed using an ASCX file, which is a mix of HTML markup and server-side code (C# or VB.NET).Usage example: Create a custom calendar control that displays events and supports custom theming or dynamic interactions, such as dragging an event to a new date. Generally more flexible and customizable.Has better performance due to pre-compilation.Can be reused in multiple applications by referencing the assembly.Derives from the .WebControls.WebControl class.Developed using a compiled language, such as C# or VB.NET.They have distinct differences and usage scenarios: AnswerĬustom controls and user controls are two methods of creating reusable components in ASP.NET. What are the differences between a custom control and a user control in ASP.NET? Provide examples of when you would choose to use each. When a postback occurs, the ViewState data is sent back to the server, decrypted if necessary, and deserialized to restore the state of the control. In summary, ViewState works by serializing, and optionally encrypting, the control state data and storing it in a hidden field on the webpage. By enabling ViewState encryption in the web.config file, the ViewState data is encrypted before it is stored in the hidden field and decrypted when retrieved during a postback. ASP.NET provides the LosFormatter class to perform this encryption. Encryption: ViewState data can be sensitive, and to maintain security, it is possible to encrypt the serialized data before storing it in the hidden field.The ViewState data is serialized into a stream of bytes, which is then converted into a base-64 encoded string to be stored in hidden fields. This is accomplished through serialization. Serialization: ViewState data needs to be converted into strings so that they can be stored in the hidden field.When a postback occurs, ViewState information is sent back to the server, which is then used to repopulate the control state. ViewState data is converted into base-64 encoded strings and stored in this hidden field. This field is named _VIEWSTATE and is located within the HTML source code of the page. Hidden fields: ViewState information is stored in a hidden field on the web page.Here’s a brief overview of ViewState and how these techniques come into play: It is implemented with various techniques such as hidden fields, encryption, and serialization. AnswerĪSP.NET’s ViewState is a mechanism to preserve the state of a control across postbacks, without using server resources like session state. In ASP.NET, how does the ViewState maintain state across postbacks for a given control? Explain the role of hidden fields, encryption, and serialization in this process. ![]()
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