Use a delegate to implement child forms to operate controls in the parent form

CodeImplementation
In form1, A lable1; In form2, control the display or hiding of lable1 in form1!
Form1 code:

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2. Namespace windowsapplication2
4. {
6. Public Delegate void setvisiablehandler ();
8. Public partial class form1: Form
10. {
12. Public form1 ()
14. {
16. Initializecomponent ();
18. }
22. Private void button#click (Object sender, eventargs E)
24. {
26. Form2 FRM = new form2 (New setvisiablehandler (setvisiable ));
28. FRM. Show ();
30. }
34. Private void setvisiable ()
36. {
38. Setvisiable (this. label1 ,! This. label1.visible );
40. }
44. Private void setvisiable (Control, bool visiable)
46. {
48. If (this. Controls. Contains (Control ))
50. {
52. Control. Visible = visiable;
54. }
56. }
58. }
60. }

Namespace windowsapplication2 {Public Delegate void setvisiablehandler (); Public partial class form1: FORM {public form1 () {initializecomponent ();} private void button1_click (Object sender, eventargs E) {form2 FRM = new form2 (New setvisiablehandler (setvisiable); frm. show ();} private void setvisiable () {setvisiable (this. label1 ,! This. label1.visible);} private void setvisiable (Control, bool visiable) {If (this. Controls. Contains (Control) {control. Visible = visiable ;}}}}

Form2 code

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2. Namespace windowsapplication2
4. {
6. Public partial class form2: FORM {
8. Private setvisiablehandler m_setvisible;
10. Public form2 (setvisiablehandler setvisible)
12. {
14. Initializecomponent ();
16. This. m_setvisible = setvisible;
18. }
22. Private void btnvisible_click (Object sender, eventargs E)
24. {
26. If (this. m_setvisible! = NULL)
28. {
30. This. m_setvisible ();
32. }
34. }
36. }
38. }