How can you identify that the page is post back?

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There is a property, named as “IsPostBack” property. You can check it to know that the page is post backed or not.

In a .NET interview, if you’re asked how to identify whether a page is a postback, you would typically mention the following:

In ASP.NET, a postback occurs when the client sends data back to the server. This usually happens when a form is submitted or when certain controls trigger a postback event, such as a button click.

To identify whether a page is experiencing a postback, you can use the IsPostBack property of the Page class. This property returns a boolean value indicating whether the page is being loaded in response to a client postback, or if it is being loaded for the first time.

Here’s a sample code snippet demonstrating how you can check for postback in ASP.NET:

csharp
protected void Page_Load(object sender, EventArgs e)
{
if (IsPostBack)
{
// Page is experiencing a postback
// Perform actions specific to postback
}
else
{
// Page is loading for the first time
// Perform initial setup
}
}

In this code, if IsPostBack is true, it indicates that the page is experiencing a postback, and you can execute code specific to handling postback events. If IsPostBack is false, it means that the page is loading for the first time, and you can perform any necessary initialization.