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I have large sets of data but somewhere in columns there is missing data either on purpose if it doesn’t exist so it’s null or it is missing so that field is null.Should I represent this value as number that I don’t use in my data ranges like -1 or something else?
You can use default(T); You can also use Nullable’s..
http://msdn.microsoft.com/en-us/library/b3h38hb0.aspx
Check out my reporting class for Missing Data
https://net7ntcip.codeplex.com/SourceControl/changeset/view/89621#1751861
https://net7ntcip.codeplex.com/SourceControl/changeset/view/89621#1751850