Oh man,if you have the dropdownlist's autopostback on ,then you will get the popup very hard. you can register your popup code in the indexchabged event.or just like above,you can write the popup code in the client,and register the popupcode into the dropdownlist ,and use the onchange event to trigger.

I can do！

just use the gridview's rowcommand/row_editing/row_updating event ,have a try!!!

I can do！

AS the reason of page life cycle of asp.net, so if you generate the excel file in the backend using C#,it will works out the excel first then the alert. you needn't put the alert phrase into the backend,just write it on the frontend , using a function to to represent it,alertme for example , then in the asp.net button ,you just register the following code : onclientclick="alertme();" best regards...thx

I can do！

May be he/she can see the differences from the URL in the ie. why not add something different to the result1.aspx/result2.aspx/result3.aspx?

I can do！

Have you done it yet? I can't help you ,I am new here ,if you get the answer,please let me konw ,thank you.

I can do！