string str="server=KABEN;uid=kaben;pwd=64006294;database=manage"; conn.ConnectionString=str; string se="insert into workers(name,sex,card,age,posit) values('"+textBox1.Text+"','"+comboBox1.SelectedItem.ToString()+"','"+textBox2.Text+"','"+textBox4.Text+"','"+textBox3.Text+"')"; SqlCommand com=new SqlCommand(se,conn); com.Connection.Open(); com.ExecuteNonQuery(); com.Connection.Close();

每次运行到 string se所在的行，都报这个错误：未将对象饮用设置到对象实例。帮帮忙