The maximum size, in logical units, of the underlying field type of the user-defined type.
Assembly: System.Data (in System.Data.dll)
Logical unit is bytes (with a maximum size of 8000) for the binary and non-Unicode data types, and the number of Unicode characters (with a maximum size of 4000) for the character field types.
The value -1 is reserved for large character and binary types.
The default value is 4000 for Unicode character types and 8000 for binary and non-Unicode types.