DropdownList retains value when AppendDataBoundItems = true;

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C#

ASP.NET

I have a databound Dropdownlist, which the data is filtered based on the active user,
I wanted to place an initial value before the items are displayed at the dropdown

in order for the initial value to be displayed,

I have set AppendDataBoundItems = true;

It is now displaying the initial value, the problem is, when I change the user, the values inside the dropdown list retains its previous values and add new values from the new selection.

Is there any other way to include an "INITIAL VALUE" like choose or select on a databound dropdown list?