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<script type="text/javascript" language="javascript">
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function previewImg(upimg){
var preview=document.getElementById("preview");
preview.innerHTML="<img width=150 src='"+upimg+"'/>";
}
<asp:FileUpload ID="FileUpload1" onpropertychange="previewImg(this.value)" runat="server" />
</script>
function test(a){
var aa=document.getElementById("<%=imgBusinessForm.ClientID %>");
aa.src=a.value;
}
<asp:Image ID="imgBusinessForm" runat="server" Height="156px" Width="105px" /><br />
<asp:FileUpload ID="fpImg" runat="server" onchange="test(this)" CssClass="txt"/>
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