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Firstly you are creating a DataTable object named dt and again you are creating same DataTable object dt. I am not sure why you are creating two objects with same name and two times. Both dt objects same data.

Secondly use IsPostBack like below code:

protected void Page_Load(object sender, EventArgs e)

{

if (Page.IsPostBack)

{

// It will hit when any action happens in page. Implement your logic

}

else

{

// It will hit when page loads first time.. Implement your logic

}