Widening Conversion - VB and C# allow implicit converison if destingation type can accomodate all possible values from the source. For example: Dim i as Integer = 1 Dim d as Double = 1.0001 d = 1 ' Conversion allowed. Narrowing Conversion - Range or precision of the source type exceeds the destingation type. Usally requires explicit conversion. For Example: .ToString, .TryParse, CBool, Cint, etc. Boxing - Convert a value type to a reference type. For Example: Convert Integer to Object Dim i as Integer = 123 Dim o as Object = CType(i, Object) UnBoxing - Convert a reference type to a value type. For Example: Assign reference object to value type. Dim o as Object = 123 Dim i as Integer = CType(o, Integer) Use Widening/implicit keywo rd for conversions that don't lose precision. Use Narrowing/explicit keyword for conversion that could lose precision. For Example: Public Shared Widening Operator CType(ByVal arg as Integer) As TypeA ...
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