Gets the count of Leadtools.Medical.ExternalStore.DataAccessLayer.DataTypes.ExternalStoreInstance that need to be cleared from the 'Local Store'
expirationDays
Number of days the dataset remains in the 'Local Store' before it expires (i.e. is deleted).
the count of Leadtools.Medical.ExternalStore.DataAccessLayer.DataTypes.ExternalStoreInstance that need to be cleared from the 'Local Store'