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

I have 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"/>


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Method 1

In web.config

    <pages maintainScrollPositionOnPostBack="true">

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