hide and view in server side using selected index changed

Question

hi friends

 

im created client side table to call the server side using ddlbox changed events its not hide

This is my ddlbox event::

 

protected void ddl_rectfication_type_SelectedIndexChanged(object sender, EventArgs e)

{

if (ddl_rectfication_type.SelectedItem.Text == "PRE" || ddl_rectfication_type.SelectedItem.Text == "FTS")

{

pres.Visible = true;

shift.Visible = false;

}

if (ddl_rectfication_type.SelectedItem.Text == "CWS")

{

pres.Visible = false;

shift.Visible = true;

}

 

first table :::

 

<table id="shift" runat="server">

<tr>

<td> <asp:Label ID="lbl_shift" runat="server">Shift Timing</asp:Label></td>

<td> <asp:DropDownList ID="ddl_shift" AutoPostBack="true" runat="server"></asp:DropDownList></td>

</tr>

</table>

 

second table ::

 

<table id="pres" runat="server">

<tr>

<td class="auto-style3"> <asp:Label ID="lbl_present_In_time" runat="server">Present IN Time</asp:Label></td>