<script language="javascript" type="text/javascript">
function Back()
{
window.history.go(-1);
}
</script> <asp:Button id="Button2" style="background: url(Normal/tool-bkgd.jpg) repeat-x; BACKGROUND-IMAGE: url(LookOut/cancel.gif); BACKGROUND-REPEAT: no-repeat;" runat="server" Text="取消" Width="79px" OnClientClick="return back();"></asp:Button>
function Back()
{
window.history.go(-1);
}
</script> <asp:Button id="Button2" style="background: url(Normal/tool-bkgd.jpg) repeat-x; BACKGROUND-IMAGE: url(LookOut/cancel.gif); BACKGROUND-REPEAT: no-repeat;" runat="server" Text="取消" Width="79px" OnClientClick="return back();"></asp:Button>
Button2.Attribute.Add("onclick") = js;试一下要不就在Button的事件里写
Page.RegisterStartupScript("a","<script> window.history.go(-1);</script>");
还有就是<asp:Button>控件没有OnClientClick这个事件
<input type="button" onclick="Back()" value="取消" />