ADO.NET Adapter.Update() what's wrong in my Code

I will be add Data in my Example Database. I have this Code by a ASP.NET Book but this will not work. Error message: Operation must be a actually Query use.
Error in: adapter.Update(dataset,"Authors");
My Code:

private void bt_add_Click(object sender, System.EventArgs e)
{
OleDbConnection conn = new OleDbConnection("Provider=Microsoft.Jet.OLEDB.4.0; " +
@"Data Source=c:\aspnet_gup.mdb");
conn.Open();
string SQL = "SELECT * FROM Authors";
OleDbDataAdapter adapter = new OleDbDataAdapter(new OleDbCommand(SQL,conn));
OleDbCommandBuilder custCB = new OleDbCommandBuilder(adapter);
DataSet dataset = new DataSet();
adapter.Fill(dataset,"Authors");

DataRow row = dataset.Tables["Authors"].NewRow();
row["Firstname"]=tb_firstname.Text;
row["Lastname"] =tb_lastname.Text;

dataset.Tables["Authors"].Rows.Add(row);

adapter.Update(dataset,"Authors");
dataset.Tables["Authors"].Clear();
adapter.Fill(dataset,"Authors");

myDataGrid.EditItemIndex= -1;
myDataGrid.DataSource= dataset;
DataBind();
conn.Close();
}

Thank you for you help

Peter

[Tampa .NET Koder]

you cannot call this method passing 2 parameters. The dataadapter.update()
accepts a dataset object. So to get to the tables authors you would have to
do something like this

adapter.update(dataset.tables("authors"))

look here for the ducumentation:
http://msdn.microsoft.com/library/de...pdatetopic.asp

"Pe**********@ua.net" wrote:

I will be add Data in my Example Database. I have this Code by a ASP.NET Book but this will not work. Error message: Operation must be a actually Query use.
Error in: adapter.Update(dataset,"Authors");
My Code:

private void bt_add_Click(object sender, System.EventArgs e)
{
OleDbConnection conn = new OleDbConnection("Provider=Microsoft.Jet.OLEDB.4.0; " +
@"Data Source=c:\aspnet_gup.mdb");
conn.Open();
string SQL = "SELECT * FROM Authors";
OleDbDataAdapter adapter = new OleDbDataAdapter(new OleDbCommand(SQL,conn));
OleDbCommandBuilder custCB = new OleDbCommandBuilder(adapter);
DataSet dataset = new DataSet();
adapter.Fill(dataset,"Authors");

DataRow row = dataset.Tables["Authors"].NewRow();
row["Firstname"]=tb_firstname.Text;
row["Lastname"] =tb_lastname.Text;

dataset.Tables["Authors"].Rows.Add(row);

adapter.Update(dataset,"Authors");
dataset.Tables["Authors"].Clear();
adapter.Fill(dataset,"Authors");

myDataGrid.EditItemIndex= -1;
myDataGrid.DataSource= dataset;
DataBind();
conn.Close();
}

Thank you for you help

Peter