How to set re-focus after drop down list value changed?

I have asp.net web app based on web forms.
A ‘Drop Down List’ has AutoPostBack property. My backend code is working well. But after changing the ‘Drop-Down List’ value, my page reloaded and start to show the top of the page.

I want to keep ‘Drop Down List’ item focused after selecting a value. How can I do that?
Here is my ‘Drop Down List’ control code.

<asp:DropDownList runat="server" ID="ddlPackagingMaterials" CssClass="form-control select2" OnSelectedIndexChanged="ddlPackagingMaterials_SelectedIndexChanged" AutoPostBack="true"/>

Answers:

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Method 1

In web.config

<system.web>
    <pages maintainScrollPositionOnPostBack="true">


All methods was sourced from stackoverflow.com or stackexchange.com, is licensed under cc by-sa 2.5, cc by-sa 3.0 and cc by-sa 4.0

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