Display Javascript Alert in ASP.NET

Alert.aspx
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Public Sub MyMsgBox(ByVal Message As String)
System.Web.HttpContext.Current.Response.Write("[SCRIPT LANGUAGE=""JavaScript""]" & vbCrLf)
' System.Web.HttpContext.Current.Response.Write("alert(""Hello Sir"")" & vbCrLf)
System.Web.HttpContext.Current.Response.Write("alert(""" & message & """)" & vbCrLf)
System.Web.HttpContext.Current.Response.Write("[/" & "SCRIPT" & "]")
End Sub
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Private Sub Button1_click(ByVal o As Object, ByVal e As EventArgs)
MyMsgBox("hello")
End Sub
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[asp:Button ID="Button1" runat="server" Text="Button" OnClick="Button1_click"/]