Display MessageBox From ServerSide

Protected Sub Page_Load(ByVal sender As Object, ByVal e As System.EventArgs) Handles Me.Load
    Dim message As String = "Hello! Mudassar."
    Dim sb As New System.Text.StringBuilder()
    sb.Append("<script type = 'text/javascript'>")
    sb.Append("window.onload=function(){")
    sb.Append("alert('")
    sb.Append(message)
    sb.Append("')};")
    sb.Append("</script>")
    ClientScript.RegisterClientScriptBlock(Me.GetType(), "alert", sb.ToString())
End Sub

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