asp.net - Passing a value back from ImageButton -

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i'm learning doing wrong. want display multiple avatar images on screen (75 when suss bit) , have user select one. when click 1 calls procedure avatar_click need recognise 1 has been clicked.. how do ? have far..

    <td><asp:imagebutton id="imagebutton1" runat="server" width="20px" imageurl="~/files/images/avatars/a01 copy.gif" onclick="avatar_click" /></td>     <td><asp:imagebutton id="imagebutton2" runat="server" width="20px" imageurl="~/files/images/avatars/a02 copy.gif" onclick="avatar_click" /></td>     <td><asp:imagebutton id="imagebutton3" runat="server" width="20px" imageurl="~/files/images/avatars/a03 copy.gif" onclick="avatar_click" /></td>  protected sub avatar_click(sender object, e eventargs)  end sub

what need put in vb procedure avatar_click ?

any appreciated.

add commandargument each button

<td><asp:imagebutton id="imagebutton1" runat="server" width="20px" imageurl="~/files/images/avatars/a01 copy.gif" commandargument="a01" onclick="avatar_click" /></td> <td><asp:imagebutton id="imagebutton2" runat="server" width="20px" imageurl="~/files/images/avatars/a02 copy.gif" commandargument="a02" onclick="avatar_click" /></td> <td><asp:imagebutton id="imagebutton3" runat="server" width="20px" imageurl="~/files/images/avatars/a03 copy.gif" commandargument="a03" onclick="avatar_click" /></td>

in button click, retrieve commandargument

protected sub avatar_click(sender object, e eventargs)    dim btn imagebutton = ctype(sender, imagebutton)    dim buttonclickedvalue string = btn.commandargument end sub

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