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null objects

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  • what are null objects

    That is a simple question that can have a very complex answer.  See, for instance:
    https://en.wikipedia.org/wiki/Null_Object_pattern

    If you provide some context (an example with an error message, perhaps) then it may be possible to make a more specific comment. For instance, the term 'null object' is often used when what is actually meant is 'no object'.

    Saturday, April 22, 2017 5:39 AM
  • Hi pavan,

    When you define a string variable, its contents are actually Null and not "". What's the difference? Null means that the variable has not been assigned a value (refer to Four rules for Nulls). "" means the Variable has been assigned a blank value.

    The System.DBNull value indicates that the Object represents missing or nonexistent data. DBNull is not the same as Nothing, which indicates that a variable has not yet been initialized. DBNull is also not the same as a zero-length string (""), which is sometimes referred to as a null string.

    Hope it is helpful to you.

    Best Regards,

    Cherry Bu


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    Tuesday, April 25, 2017 2:54 AM
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