C #: inaccessible because it is restricted by the protection level !!

Start learning C #
I have created two forms
Form1 he form2
An error is included during debugging.
C: \ Documents ents and Settings \ Administrator \ My Documents ents \ c \ windowsapplication6 \ form1.cs (130): "windowsapplication6.form2. label1" cannot be accessed because it is restricted by the protection level
For specific error lines, see the following
Yourform. label1.font = new font ("", 16 );
Yourform. label1.backcolor = color. Aqua;
Yourform. label1.text = "this is Form 2 ";

I found it online! This is probably a private or public issue.
Private is a private variable.
Public is a common variable.
In Form 2
Public class form2: system. Windows. Forms. Form
{
Private system. Windows. Forms. Button button1;
Private system. Windows. Forms. Label label1;

Change private system. Windows. Forms. Label label1 to public system. Windows. Forms. Label label1;
OK!