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OleDbConnection conn = new OleDbConnection();
conn.ConnectionString = @"Provider=Microsoft.ACE.OLEDB.12.0;Data Source=" + pfad;Persist Security Info=False;";
conn.Open();

DataSet myDS = new DataSet();
OleDbDataAdapter adapter = new OleDbDataAdapter();
adapter.InsertCommand = new OleDbCommand("INSERT INTO Noten (ID, Bewertung) VALUES (1, 2)");
OleDbCommandBuilder builder = new OleDbCommandBuilder(adapter);
adapter.Fill(myDS, "Noten");

conn.Close();