you can use the "user settings" described here: http://msdn.microsoft.com/en-us/library/bb397750.aspx
//EDIT:
let's say You have a USER Setting of type string called "MySetting"
if you want to read it:
var someVar = Properties.Settings.Default.MySetting;
if you want to write it (assuming your data is in someVar
):
Properties.Settings.Default.MySetting = someVar;
Properties.Settings.Default.Save();
the call to Save() persists your changes ... the changes are bound to the windows user account
at design time your setting should be defined as Scope USER