protected property of parent class

Question

Hello I use a parent class property called "Contribuable" and then I called in a derived class called "ContribuableMoral" during execution but it appears to me in the null derived class method.

 

public class contribuable

{

protected string MATRICULE_FISCALE;

public contribuable(string _matricule_fiscale)

{

this.MATRICULE_FISCALE = _matricule_fiscale; //example MATRICULE_FISCALE=123456789

}

public void insertContribuable()

{

string sql = "insert into CLIENT (MATRICULE_FISCALE)values('" +this.MATRICULE_FISCALE +"')"; //MATRICULE_FISCALE=123456789

}

}

class ContribuableMoral:contribuable

{

public ContribuableMoral()

{

}

public void InsertionMorale()

{

string sqlMorale = "insert into CLIENT_MORALE(MATRICULE_FISCALE) values('" + MATRICULE_FISCALE + "')"; //MATRICULE_FISCALE=null

}

}

 

 

normally ownership relatives told the class can be called to the derived class?!!!!!!!!!!!