Problem in ExportToHttpResponse .

Hi Friends ,

I am trying to export my report in PDF format , so i am using below code to generate in PDF .

rpt.ExportToHttpResponse(ExportFormatType.PortableDocFormat,Response,false,"INVOICE_REPORT");

i am trying to save my pdf with default name , i.e  INVOICE_REPORT  which i mentioned above code (attachment as name) .

There is no problem with chrome and firefox , while i am click the save button , its automatically displaying the name which i mentioned in above code .

But in IE , while i am clicking the save pdf file , its displaying my aspx page name .

I need to display (attachment as name) default name in IE , please give me a solution .