Question

I have multiple dropdownlist in a page and would like to disable all if user selects a checkbox which reads disable all. So far I have this code and it is not working. Any suggestions?

foreach (Control c in this.Page.Controls) {     if (c is DropDownList)         ((DropDownList)(c)).Enabled = false; } 

Answer 1

Each control has child controls, so you’d need to use recursion to reach them all:

protected void DisableControls(Control parent, bool State) {     foreach(Control c in parent.Controls) {         if (c is DropDownList) {             ((DropDownList)(c)).Enabled = State;         }          DisableControls(c, State);     } } 

Then call it like so:

protected void Event_Name(...) {     DisableControls(Page,false); // use whatever top-most control has all the dropdowns or just the page control } // divs, tables etc. can be called through adding runat='server' property