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SqlCommand.Connection Property


Gets or sets the SqlConnection used by this instance of the SqlCommand.

 property System::Data::SqlClient::SqlConnection ^ Connection { System::Data::SqlClient::SqlConnection ^ get(); void set(System::Data::SqlClient::SqlConnection ^ value); };
public System.Data.SqlClient.SqlConnection Connection { get; set; }
public System.Data.SqlClient.SqlConnection Connection { get; set; }
member this.Connection : System.Data.SqlClient.SqlConnection with get, set
member this.Connection : System.Data.SqlClient.SqlConnection with get, set
Public Property Connection As SqlConnection

Property Value

The connection to a data source. The default value is null.



The Connection property was changed while the command was enlisted in a transaction.


The following example creates a SqlCommand and sets some of its properties.

private static void CreateCommand(string queryString,
    string connectionString)
    using (SqlConnection connection = new SqlConnection(
        SqlCommand command = new SqlCommand();
        command.Connection = connection;
        command.CommandTimeout = 15;
        command.CommandType = CommandType.Text;
        command.CommandText = queryString;

        SqlDataReader reader = command.ExecuteReader();
        while (reader.Read())
            Console.WriteLine(String.Format("{0}, {1}",
                reader[0], reader[1]));
Public Sub CreateCommand(ByVal queryString As String, _
  ByVal connectionString As String)
    Using connection As New SqlConnection(connectionString)
        Dim command As New SqlCommand()
        command.Connection = connection
        command.CommandTimeout = 15
        command.CommandType = CommandType.Text
        command.CommandText = queryString

        Dim reader As SqlDataReader = command.ExecuteReader()
            While reader.Read()
            Console.WriteLine(String.Format("{0}, {1}", _
                reader(0), reader(1)))
        End While
    End Using
End Sub


If the command is enlisted in an existing transaction, and the connection is changed, trying to execute the command will throw an InvalidOperationException.

If the Transaction property is not null and the transaction has already been committed or rolled back, Transaction is set to null.

Applies to

See also