Multiple Inheritance programm

userEntities am = new userEntities();
     Table_1 ta = new Table_1();
     ta.ID = Convert.ToInt32(textBox6.Text);
     ta.name = textBox9.Text;
     ta.last_name = textBox8.Text;
     ta.phon_number = maskedTextBox2.Text;
     ta.adress = textBox7.Text;
     am.AddToTable_1(ta);
     am.SaveChanges();
     showdata();