c# - can't set image url from onclick event -

c# - can't set image url from onclick event -

i have problem setting image url image id

my button image is

<asp:imagebutton id="butim" runat="server" imageurl='<%# eval("image1") %>' commandargument='<%# eval("image1") %>' onclick="selectimage" width="100" height="100" />

this image button works correctly

my event

protected void selectimage(object sender, imageclickeventargs e) { string imagename = ((imagebutton)sender).commandargument; imgvw.imageurl = imagename; popimg.show(); }

my target popup

<ajaxtoolkit:modalpopupextender id="popimg" runat="server" popupcontrolid="panel1" backgroundcssclass="modalbackground" dropshadow="true" enabled="true" cancelcontrolid="cancel"> </ajaxtoolkit:modalpopupextender> <asp:panel id="panel1" runat="server" cssclass="modalpopup"> <asp:image id="imgvw" runat="server" /><br /> <asp:button id="cancel" runat="server" text="kembali" class="art-button" onclick="btncancel_click" /> </asp:panel>

my problem when set breakpoint on event, see url of imgvw.imageurl has right path can't display image. when input url manually on asp image id

<asp:image id="imgvw" imageurl="../image/image1.jpg" runat="server" />

popup can display image perfectly

can help me please?

c# asp.net url