Unique Static Variable

Hi All,

I have a C# Web Part I am developing in VS2010. 

I have a drop down list in it that is configured as public/private (tried both) static.  This gives it retention across page refreshes, but when another Users accesses and changes the drop down list value (or the same User from another tab/window) the value changes to the last one selected.

Is there any way to correct this without losing the variable persistence functionality?

Thanks,

MK