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ASP.NET is a web application framework by Microsoft that allows developers to build dynamic websites, web applications, and web services. It is a part of the larger .NET framework and provides a programming model, tools, and libraries for building web applications.

One of the key concepts in ASP.NET is the use of controls. Server controls are reusable components that encapsulate the user interface and behavior of a web application. They are defined in the ASP.NET markup language and can be used to create elements such as buttons, textboxes, dropdown lists, and more.

Example:

Let's say we want to create a simple web form that allows users to enter name and submit it. We can use the TextBox server control to create an input for the name and the Button server control to create a submit button.




In the above example, the TextBox control is assigned an ID of “txtName” and the Button control is assigned an ID of “btnSubmit”. These IDs can be used in the code-behind file to access the values entered by the user or to handle events like button clicks.

Code-behind:

The code-behind file is where the server-side logic of an ASP.NET application is written. It the event handlers for server control events, data access code, and server-side functionality.


protected void btnSubmit_Click(object sender, EventArgs e)
{
    string name = txtName.Text;
    // Do something with the entered name
}

In the above code-behind example, the btnSubmit_Click event handler is triggered when the submit button is clicked. It retrieves the entered in the txtName TextBox control and performs some with it, such as saving it to a or displaying it on the page.

ASP.NET provides a wide range of server controls, data binding capabilities, and other features that make it a powerful framework for building web applications. It also supports various programming languages such as C# and VB.NET, allowing developers to choose the language they are most comfortable with.

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