i used a linkbutton inside repeater,when it is clicked whole page is refresh .
linkbutton name is comment.
i want when link button is clicked ,textbox(txtcomment) should be visible,without refreshing the entire page
<asp:Repeater ID="RepeaterNews" runat="server"
onitemcommand="RepeaterNews_ItemCommand" >
<ItemTemplate>
<table class="style1" style="border: thin solid #C0C0C0; margin-left: 50px; background-color: #99CCFF;" cellspacing="0">
<tr>
<td rowspan="2"> <asp:Image ID="Image1" runat="server" ImageUrl='<%#Bind("Photo") %>' Width="80" Height="70" />
</td>
<td class="style2" style="background-color: #99CCFF"><asp:Label ID="lblsender" runat="server" Text='<%# Bind("Fname")%>' Font-Bold="True"></asp:Label>
</td>
<td style="background-color: #99CCFF" align="right"><asp:Label ID="lbltime" runat="server" Text='<%#Bind("DateOfNews")%>'></asp:Label>
</td>
</tr>
<tr>
<td colspan="2">
<asp:Label ID="lblnewstype" runat="server" Text="Shared :"></asp:Label><asp:Label ID="lblnewsstatus" runat="server" Text='<%#Bind("Status") %>'></asp:Label>
</td>
</tr>
<tr>
<td>
</td>
<td colspan="2"><asp:Label ID="lblmessage" Width="600px" runat="server" Text= '<%#Bind("NewsMsg") %>'></asp:Label>
</td>
</tr>
<tr>
<td>
</td>
<td colspan="2" align="center"><asp:Image ID="imgnews" runat="server" ImageUrl='<%#Bind("NewsImg") %>' Height="300" Width="400" />
</td>
</tr>
<tr>
<td>
</td>
<td colspan="2">
</td>
</tr>
<tr>
<td>
</td>
<td><asp:LinkButton ID="linkdelete" runat="server" CommandName="Delete" Text="delete"></asp:LinkButton>
</td> <td>
<asp:LinkButton ID="LinkButton1" CommandName="comment" Font-Size="Small" runat="server">comment</asp:LinkButton>
<asp:TextBox ID="txtcomment" runat="server" Visible="False"></asp:TextBox>
</td>
</tr> <tr >
<td colspan="3" style="background-color: #FFFFFF; height: 50px;"></td>
</tr>
</table>
<br>
</br>
<br></br>
</ItemTemplate>
</asp:Repeater>