Merge | Align Type aliases between netfx and netcore (#2957)

* Align Type aliases between netfx and netcore

* Align more type aliases

* Fix some more type aliases / minor code style

* Add missing ;

Author: MichelZ

src/Microsoft.Data.SqlClient/netcore/src/Microsoft/Data/SqlClient/TdsParser.cs

@@ -12539,7 +12539,9 @@ private byte[] SerializeUnencryptedValue(object value, MetaType type, byte scale
                     if (type.FixedLength == 4)
                     {
                         if (0 > dt.days || dt.days > UInt16.MaxValue)
+                        {
                             throw SQL.SmallDateTimeOverflow(MetaType.ToDateTime(dt.days, dt.time, 4).ToString(CultureInfo.InvariantCulture));
+                        }
 
                         if (stateObj._bIntBytes == null)
                         {