forms - How to change variable values between namespaces / classes? -

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i have main form textbox1 string value : asd

namespace crystal {     public partial class mainform : form     {        //here textbox1 text "asd"     } }

i want change textbox1 text class:

namespace crystal.utilities {    public class logging    {        //textbox1.text = "dsa";    } }

the problem is, cant change value of textbox1 logging class, because doesnt exists there :/ how this?

don't need expose entire textbox - don't want others mess other things text, , think it's more readable , simple call method that, instead of accessing textbox directly. 

 namespace crystal {     public partial class mainform : form     {        public void settextbox1text(string newtext)        {         textbox1.text=newtext        }     } }
  
namespace crystal.utilities {    public class logging    {        mainform.settextbox1text("new text");    } }


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