How to call JavaScript function to from GridView Row Click in ASP.Net

This way

HTML

 <asp:GridView ID="gvDemo" runat="server" AutoGenerateColumns="false" OnRowDataBound = "OnRowDataBound">
        <Columns>
            <asp:BoundField DataField="Code" HeaderText="Code" />
            <asp:BoundField DataField="Name" HeaderText="Name" />
        </Columns>
    </asp:GridView>
    <script type="text/javascript">
        function openWindow(code) {
            window.open('page.aspx?Code=' + code, 'open_window', ' width=640, height=480, left=0, top=0');
        }
    </script>

CODE

    protected void Page_Load(object sender, EventArgs e)
    {
        if (!this.IsPostBack)
        {
            DataTable dt = new DataTable();
            dt.Columns.AddRange(new DataColumn[2]{ 
                            new DataColumn("Code", typeof(int)), 
                            new DataColumn("Name", typeof(string))  });
            dt.Rows.Add(1, "Jake");
            dt.Rows.Add(2, "John");
            dt.Rows.Add(3, "Micheal");
            gvDemo.DataSource = dt;
            gvDemo.DataBind();
        }
    }
    protected void OnRowDataBound(object sender, GridViewRowEventArgs e)
    {
        if (e.Row.RowType == DataControlRowType.DataRow)
        {
            e.Row.Attributes["onclick"] = "openWindow('" + e.Row.Cells[0].Text + "')";
            e.Row.Attributes["style"] = "cursor:pointer";
        }
    }