Calling Javascript Value in asp.net Textbox

<%@ Page Language="VB" AutoEventWireup="false" CodeFile="Default.aspx.vb" Inherits="_Default" %>

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Partial Class _Default
Inherits System.Web.UI.Page

Protected Sub btnJSValue_Click(ByVal sender As Object, ByVal e As EventArgs) Handles btnJSValue.Click
txtJSValue.Text = inpHide.Value
End Sub

End Class