EventArgs in Asp.net

jasna ashraf wrote:

What is the meaning of this statement.

It overriding the OnInit method to set a property on the associated control and call the base method to complete the control initialization.

Override OnInit to perform target-specific processing in the Initialize stage of the control lifecycle.

using System;
using System.Web.UI;
using System.Web.UI.Adapters;
public class CustomControlAdapter : ControlAdapter
{
    // Override the ControlAdapter default OnInit implementation.
    protected override void OnInit (EventArgs e)
    {
        // Make the control invisible.
        Control.Visible = false;
        // Call the base method, which calls OnInit of the control,
        // which raises the control Init event.
        base.OnInit(e);
    }
}

I suggest you to learn OOPs first with some good books.

There's many thing I could clarify you about your statement.

a) It's overridden method that just means it is overriding the base class method (Refer polymorphisom)
b) Passing object of EventArgs class with some values if passed.
c) Calling method of base class from any child class
d) Method returning nothing(void) as a return.
e) It's protected so it can only be called by object of child inherited class only.
f) OnInit is a name of method about to be called

It is override for you put your code.

base.OnInit(e);

is use for call the base method. In this method, server control are initializate and set up instance.

More information on Init in the MSDN[^], you can also see page life cycle[^]