Avoid the "Cannot have multiple items selected in a DropDownList" error message
Clearing dropdowns in ASP.NET using C# is SO very simple, yet it's something I find myself having
to look up time and time again. Maybe there's a deficiency in my brain or perhaps it's such a simple
solution to a common problem that my brain decides it doesn't need to remember it. No matter what the
case is, I always feel like a complete idiot when I build an application only to have it crash with that ugly
Cannot have multiple items selected in a DropDownList error message. Ugh. Below is the simple
one-line call to resolve this common dilemma.
Clearing dropdowns
//Clear dropdown selection
ddlCodeFileSelection.ClearSelection();
That couldn't be any simpler, could it? Now you can avoid the Cannot have multiple items selected in a DropDownList
error message by clearing your dropdown selection before making a new selection programmatically.
More information
Drop-In Code