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What is the difference between DataReader.GetValue() and DataReader[Column_Name]?

Hi All,
What is the Difference between DataReader[ColumnName] and DataReader.GetValue() .

I have one Sp which returns an out param and one cursor .while reading the first outparam by using dataReader[column_Name] it is throwing exception ,but with the help of DataReader.GetValue(0) am able to read this value.
What I believe is I should not get exception in first case also.
can someone clarify me y do we need to use GeValue(0) in case of single Parameter.

If I acess through dataReader[Param-Name] it is throwing Exception as "System.IndexOutOfRange Exception".
Nov 1 '10 #1
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