how to use itemtemplate's item textbox as the edititemtemplate in datalist

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ASP.NET

data-binding

I am using a datalist control to show per user comments.there is a comment textbox for showing comment per user in itemtemplate.now when i will click the edit command button i want that comment textbox will be enabled to edit comment text and when update is clicked that user comment will be updated.so every other comment items will stay visible only when i click edit in corresponding item the textbox will be in edit mode and then will be updated when update clicked.

in the following codes i did not use anything for edititemtemplate.please help.

<asp:DataList ID="DataList1" DataKeyField="CommentId" CssClass="MSComItem" runat="server" OnCancelCommand="DataList1_CancelCommand" OnUpdateCommand="DataList1_UpdateCommand"   
  OnEditCommand="DataList1_EditCommand">
     <itemtemplate>	
    <div style=" margin-removed130px;">
    <asp:Label ID="test" runat="server" />   
    <asp:LinkButton ID="Edit" Text="Edit" CommandName="edit" runat="server" />
     <asp:Button ID="UpdateButton" runat="server" CommandName="Update" Text="Update" />
    <asp:Button ID="CancelButton" runat="server" CommandName="Cancel" Text="Cancel" />
    </div>
    <div id="ViewMain">
    <div id="dd" style="float:left"><asp:Image ID="logog" runat="server" ImageUrl="~/desktopmodules/mscomments/images/default_user.png" />    </div>
    <div id="arrow" style="float:left"><asp:Image ID="Image1" runat="server" ImageUrl="~/desktopmodules/mscomments/images/comment_arrow.gif" />   </div>
    <div id="ss" style="float:left"><asp:TextBox ID="Comments" Enabled="false" CssClass="textbox" BorderColor="White" BorderWidth="1px" TextMode="MultiLine" runat="server" Text='<%# Bind("Comment")%>' ></div> 
</div>
    </itemtemplate><edititemtemplate></edititemtemplate>