Web Reference: Represents a Transact-SQL statement or stored procedure to execute against a SQL Server database. This class cannot be inherited. The following example creates a SqlConnection, a SqlCommand, and a SqlDataReader. The example reads through the data, writing it to the console. I was trying to run an INSERT using SqlCommand.executeReader() when I should have been using SqlCommand.ExecuteNonQuery(). It was opened and never closed, causing the error. Aug 27, 2025 · SqlClient interacts with SQL Server, and it allows the development of data-driven applications. The types we use include SqlConnection, SqlCommand, and SqlDataReader.
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