c# - Change Textfield from another class? -

i start out sourcecode:

form

using system; using system.collections.generic; using system.componentmodel; using system.data; using system.drawing; using system.io; using system.linq; using system.net.mail; using system.text; using system.text.regularexpressions; using system.threading; using system.threading.tasks; using system.windows.forms;  namespace software {     public partial class form1 : form     {         public form1()         {             initializecomponent();         }          try         {             myclasstwo 2 = new myclasstwo(); two.putvalue();         }         catch         {             messagebox.show("error!");         }     } } 

myclasstwo

using system; using system.collections.generic; using system.drawing; using system.linq; using system.text; using system.threading.tasks; using system.windows.forms;  namespace software {     public class myclasstwo     {         form1 myform = new form1();          public void putvalue()         {             myform.textbox1.text = "hello";         }     } } 

i want change content of textbox in myclassone. when doesnt work, nothing happens. can me that? updated code.

the form myclasstwo referring not same form 1 trying set text in. myclasstwo creating entirely new instance of form , setting text of that, never see.

without trying toooo hard, try this?

public class myclasstwo {      public void putvalue(form1 myform)     {         myform.textbox1.text = "hello";     } } 

and

 try     {         myclasstwo 2 = new myclasstwo();         two.putvalue(this);     } 

the idea pass form want change text in, opposed creating new form inside of myclasstwo.