Monday, November 17, 2008

What is difference between ExecuteReader, ExecuteNonQuery and ExecuteScalar.

1. ExecuteReader : Use for accessing data. It provides a forward-only, read-only, connected recordset.

2. ExecuteNonQuery : Use for data manipulation, such as Insert, Update, Delete.

3. ExecuteScalar : Use for retriving 1 row 1 col. value., i.e. Single value. eg: for retriving aggregate function. It is faster than other ways of retriving a single value from DB.

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