I have designed a web form and use the <asp:dropdownlist> control.I assigned some codes in the onSelectedIndexChanged Event.After I test it .I found that the first item in the list will not fired the event. I have to chose other item then went back to chose the first item then it would work.I try to correct it by setting the selectedindex to -1 at the first load of the form but it don't work.And try to assign some code in the code in the condition if(! IsPostBAck) .It is still not work. The reson of this problem is the first time the form loaded the selectedindex will be 0.So if I select this item the onSelectedIndexCHanged will not fire.So nothing happen.
          So if you have a trick to correct this annoying problem.Please tell me.Thank you in advance.
                                                                  Doctorsom

Hey,

The reason is there has to be a default. If no item selected, then the first one on the list is selected. You can rectify this by adding an entry such as:

<asp:ListItem Value="">Select an Item</asp:ListItem>

However, you have to make sure that if they select an item then select this again, that it doesn't cause an error.

Brian