Modifying the ASP.Net GridView Cell Text on Button Click

Refer this example

    <asp:GridView ID="GridView1" runat="server" AutoGenerateColumns="false">
        <Columns>
            <asp:BoundField DataField="Name" HeaderText="Name" />
            <asp:BoundField DataField="status" HeaderText="Status" />
            <asp:TemplateField>
                <ItemTemplate>
                    <asp:Button ID="Button1" runat="server" Text="Update" OnClick = "UpdateStatus" />
                </ItemTemplate>
            </asp:TemplateField>
        </Columns>
    </asp:GridView>

 protected void Page_Load(object sender, EventArgs e)
    {
        if (!IsPostBack)
        {
            DataTable dt = new DataTable();
            dt.Columns.AddRange(new DataColumn[2] { new DataColumn("Name"), new DataColumn("Status") });
            dt.Rows.Add("John", "Open");
            dt.Rows.Add("Rick", "Open");
            dt.Rows.Add("Andrew", "Open");
            dt.Rows.Add("Peter", "Open");
            GridView1.DataSource = dt;
            GridView1.DataBind();
}
   protected void UpdateStatus(object sender, EventArgs e)
    {
        GridViewRow row = (sender as Button).NamingContainer as GridViewRow;
        row.Cells[1].Text = "Closed";
    }