Answer / rizwan

they are called namespaces in C#.
they are included as
using System;
using System.Data;
using System.Configuration;
using System.Web;
using System.Web.Security;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;
using System.Web.UI.HtmlControls;

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One start and stop button is there and one textbox is there.when you click start button ,it will display 1,2,3......up to infinite in textbox.when you click stop button it will stop.

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