DoPostBackWithOptions coming for asp buttons

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ASP.NET

.NET

C#5.0

SharePoint2013

Hi ,

I am working in SP 2013 and i have a set of 4 asp buttons in my visual webpart. One such button is this

<asp:Button ID="btnClearfilter" runat="server" Text="Clear Filter" OnClick="BtnClearfilter_Click" CssClass="submitBtn floatLeft marginRight10" />

Another buttton

<asp:Button ID="btnExport" runat="server" Text="Export" OnClick="BtnExport_Click" CssClass="submitBtn floatLeft marginRight10" />                            

which exports the data to excel. But after the export data no other button clicks seems to work . When i inspected the page i found the button html like this

onclick="javascript:WebForm_DoPostBackWithOptions(new WebForm_PostBackOptions("ctl00$ctl29$g_12d8171b_8f06_4f2f_842e_b2924f975e25$btnExport", "", true, "", "", false, false))

Can anyone please tell me why the DoPostBackWithOptions are coming and why other button clicks are not working. Also all the buttons have the same before the export process.


Thanks in advance