I have two DropDownList controls in a web form and I need to test which
control has changed without wrapping it in a SelectedIndexChange Event.  How
do I go about this issue?  I have tried the following which works sort of but
the first time I change the selection in one of the DropDownList controls it
returns a SelectedValue of null.

public string ctrlSelection
        {
            get
            {
                if(SubList.SelectedValue == null || SubList.SelectedValue == "<-Sub
Menu->")
                {

                    return MainMenuLST.SelectedValue;
                }
                else
                {
                    return SubList.SelectedValue;
                }
            }
        }

I am Sam wrote:
Show quoteHide quoteSo they change a drop down, they click submit, and you want to see which
one has changed? What if both were changed?

DO you have an option in each DDL that states what type of DDL it is ie
your: "<-Sub Menu->".

If both have something like that,

if(SubList.SelectedText == "<-SubMenu->" || MainMenuLST.SelectedText ==
"<-MainMenu->")
{
    //Nothing Changed
}
else
{       
    if(SubList.SelectedText != "<-SubMenu->" &&        
    MainMenuLST.SelectedText == "<-Mainmenu->")
    {
        //Sublist changed
    }
    else
    {
        if(SubList.SelectedText == "<-SubMenu->" &&    
        MainMenuLST.SelectedText != "<-Mainmenu->")
        {
            //MainMenuChanged
        }
        else
        {   
            if(SubList.SelectedText != "<-SubMenu->" &&    
            MainMenuLST.SelectedText != "<-Mainmenu->")
            {
                //They Bothchanged
            }
        )
    )
)


It's long, but simple.

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