About SqlCommandBuilder

[Tony Johansson]

Hello!

This small program below works but I have some questions about it.

Below I have a piece of code that update a specific row in the northwind
database.
The class SqlCommandBuilder is used for creating a suitable update,insert or
delete sql command that
match thisAdapter.

If I look at the object thisBuilder in the debugger on for example
UpdateCommand this is null
but the class SqlCommandBuilder should create a suitable update command.

So my first question is why the UpdateCommand for thisBuilder is null ?
My second question is if it's possible to see the update command that
thisBuilder is creating ?

static void Main(string[] args)
{
//Specify SQL Server-specific connection string
SqlConnection thisConnection = new SqlConnection(
@"Server=UHT-DEMO1;Integrated Security=True;" +
"Database=northwind");

//Create DataAdapter object for update and other operations
SqlDataAdapter thisAdapter = new SqlDataAdapter(
"Select CustomerID, CompanyName from Customers",
thisConnection);

//Create CommandBuilder object to build SQl commands
SqlCommandBuilder thisBuilder = new
SqlCommandBuilder(thisAdapter);

//Create DataSet to contain related data tables, rows and
columns
DataSet thisDataSet = new DataSet();

//Fill DataSet using query defined previously for DataAdapter
thisAdapter.Fill(thisDataSet, "Customers");

//Show data before change is made
Console.WriteLine("Name before change: {0}",
thisDataSet.Tables["Customers"].Rows[9]["CompanyName"]);

//Change data in Customers table, row 9, CompanyName column
thisDataSet.Tables["Customers"].Rows[9]["CompanyName"] = "Acme,
Inc.";

//Call Update command to mark change in table
thisAdapter.Update(thisDataSet, "Customers");

Console.WriteLine("Name after change: {0}",
thisDataSet.Tables["Customers"].Rows[9]["CompanyName"]);

thisConnection.Close();

Console.WriteLine("Program finished, Press Enter/Return to
continue");
Console.ReadLine();
}