Postback when child window is refreshing the parent window

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ASP.NET

Hi folks,

I need to refresh parent window when child window is closing. And I did that. ( I will get this child window when I click on Show button.)

Now, the problem is, I have a grid, which will be loaded when the page loads in my parent window.

If I sort it and click on Show button. Now I got the child window and when I am closing the child window my parent window is getting refreshed. And due to which my grid also filled again.

And I kept the below and which is showing as false and the breakpoint is entering into the if condition.

If Not IsPostBack Then

End If

Please help me in this.

Thanks in advance.