i have 3 dropdownlists in one form .... on the first dropdownlist'sSelectedIndexChanged event the second dropdownlist is getting filled from the database and similarly the third dropdownlist is filled on second's SelectedIndexChanged event . Now in another form i am assigning values to those dropdownlists
dropdownlist1.SelectedItem="1101";
dropdownlist2.SelectedItem="abc";
dropdownlist3.SelectedItem="123-34";

when i tracedthe program i found out tat the dropdownlist1.SelectedItem="1101" is invokingits respective SelectedIndexChanged event whereas the other two r not invoking why is it so ???

SelectedIndexChanged will not fire if the item you are trying to select is already selected. If "abc" is the value selected automatically by just loading the list from the selection of the first DD control, then your second SelectedItem assignment will produce no change in the index of the second DD control, and therefore there is no SelectedIndexChanged event.

Without knowing much of your design or code, I'll suggest that a change in selection of dropdown i forces no selected item in dropdown i + 1 (where i in [1, 2]).

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MCP

SelectedIndexChanged will not fire if the item you are trying to select is already selected. If "abc" is the value selected automatically by just loading the list from the selection of the first DD control, then your second SelectedItem assignment will produce no change in the index of the second DD control, and therefore there is no SelectedIndexChanged event.

Without knowing much of your design or code, I'll suggest that a change in selection of dropdown i forces no selected item in dropdown i + 1 (where i in [1, 2]).

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MCP