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Showing content from https://docs.microsoft.com/en-us/dotnet/api/system.data.idbcommand below:

IDbCommand Interface (System.Data) | Microsoft Learn

Represents an SQL statement that is executed while connected to a data source, and is implemented by .NET data providers that access relational databases.

public interface class IDbCommand : IDisposable

public interface IDbCommand : IDisposable

type IDbCommand = interface
    interface IDisposable

Public Interface IDbCommand
Implements IDisposable

Derived

Implements

The following example creates instances of the derived classes, SqlConnection, SqlCommand, and SqlDataReader. The example reads through the data, writing it to the console. Finally, the example closes the SqlDataReader, then the SqlConnection.

private static void ReadOrderData(string connectionString)
{
    string queryString =
        "SELECT OrderID, CustomerID FROM dbo.Orders;";
    using (SqlConnection connection = new SqlConnection(
               connectionString))
    {
        SqlCommand command = new SqlCommand(
            queryString, connection);
        connection.Open();
        using(SqlDataReader reader = command.ExecuteReader())
        {
            while (reader.Read())
            {
                Console.WriteLine(String.Format("{0}, {1}",
                    reader[0], reader[1]));
            }
        }
    }
}

Public Sub ReadOrderData(ByVal connectionString As String)
    Dim queryString As String = _
        "SELECT OrderID, CustomerID FROM dbo.Orders;"
    Using connection As New SqlConnection(connectionString)
        Dim command As New SqlCommand(queryString, connection)
        connection.Open()
        Dim reader As SqlDataReader = command.ExecuteReader()
        Try
            While reader.Read()
                Console.WriteLine(String.Format("{0}, {1}", _
                    reader(0), reader(1)))
            End While
        Finally
            ' Always call Close when done reading.
            reader.Close()
        End Try
    End Using
End Sub

The IDbCommand interface enables an inheriting class to implement a Command class, which represents an SQL statement that is executed at a data source. For more information about Command classes, see Executing a Command.

An application does not create an instance of the IDbCommand interface directly, but creates an instance of a class that implements the IDbCommand interface.

Classes that implement IDbCommand must implement all its members, and typically define additional members to add provider-specific functionality. For example, the IDbCommand interface defines the ExecuteNonQuery method. In turn, the SqlCommand class inherits this method, and also defines the ExecuteXmlReader method.

To promote consistency among .NET Framework data providers, name the inheriting class in the form PrvClassname where Prv is the uniform prefix given to all classes in a specific .NET Framework data provider namespace. For example, Sql is the prefix of the SqlCommand class in the System.Data.SqlClient namespace.

When you inherit from the IDbCommand interface, you should implement the following constructors:

• DbDataAdapter
• IDbConnection
• OleDbCommand
• SqlCommand

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