VietMX Staff asked 4 years ago
ExecuteScalaris typically used when your query returns a single value. If it returns more, then the result is the first column of the first row. An example might beSELECT @@IDENTITY AS 'Identity'.ExecuteReaderis used for any result set with multiple rows/columns (e.g.,SELECT col1, col2 from sometable).ExecuteNonQueryis typically used for SQL statements without results (e.g., UPDATE, INSERT, etc.).
