How to insert items in a listview in descending order

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C#

Hi..,

Actually i am using a listview control.i have two column named orderno. and tableno.
in that.I hv two textbox also,1 is for order entry and another is for table no entry.
when i am giving a entry to orderno and tableno it will display in that listview.

so what my problem is,I want those entry nos in list in upwards.suppose there are already two orderno and table nos in list.so while i give entry to new orderno and tableno through the textbox,it should shows in firstline of the listview.

I hope my question is clear..please anybody is dere plz help me out.i am stuck in ds.its my urgent requirement.so please help me.