<script type="text/javascript"> function deteterecord() { alert('hi'); } </script>
<asp:Button ID="btnSave" runat="server" Text="Save" onclick="btnSave_Click" OnClientClick= "javascript:return deteterecord()" />
btnSave.attributes.add("onclick","javascript:return deteterecord();");
<asp:button id="btnSave" runat="server" text="Save" onclick="btnSave_Click" OnClientClick="deteterecord();"/></asp:button>
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