OleDbCommand command = new OleDbCommand(sqlExpression, connection);

int number = command.ExecuteNonQuery();

string sqlExpression = "INSERT INTO Users (Name, Age) VALUES ('Tom', 18)";

OleDbConnection connection = new OleDbConnection(connectionString)

string connectionString = "Provider=Microsoft.Jet.OLEDB.4.0; Data Source=database.mdb;";