Write JavaScript function Code Behind in ASP.Net using C#

Private Sub Chart1()

        Dim str As String = ""

        str += "<script type='text/javascript' src='https://www.google.com/jsapi'></script>"

        str += "<script type='text/javascript'>"

        str += "google.load('visualization', '1', {packages:['corechart']});"

        str += "google.setOnLoadCallback(drawChart2);"

        str += "function drawChart2() {"

        str += "var data2 = google.visualization.arrayToDataTable(["

        str += "['Kegiatan', 'Waktu(Jam)'],"

        str += "['Bekerja',     11],"

        str += "['Makan',      2],"

        str += "['Perjalanan',  2],"

        str += "['Hiburan / TV', 2],"

        str += "['Tidur',    7]"

        str += "]);"

        str += "var options2 = {"

        str += "title: 'Kegiatan Sehari-Hari'"

        str += "};"

        str += "var chart2 = new google.visualization.PieChart(document.getElementById('chart_div2'));"

        str += "chart2.draw(data2, options2);"

        str += "var chart2 = new google.visualization.PieChart(document.getElementById('chart_div3'));"

        str += "chart2.draw(data2, options2);"

        str += "var chart2 = new google.visualization.PieChart(document.getElementById('chart_div4'));"

        str += "chart2.draw(data2, options2);"

        str += "}"

        str += "</script>"

        ClientScript.RegisterClientScriptBlock(Me.GetType(), "alert", str)

    End Sub