Question is the title itself.
__doPostBack('<%=btnABC.UniqueID %>', '') and
onClick="Button1_Click"
Question is the title itself.
__doPostBack('<%=btnABC.UniqueID %>', '') and
onClick="Button1_Click"
you could refer to the following threads which discuss same: What is the difference between client browser's submit mechanism and the ASP.NET postback mechanism? &