c# - Access from a different classes to the RichTextBox of MainForm.cs (Windows Forms Application) -

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For example, in the same class, I am using the word "this" but I am from another class in this RichTextBox How can I access Remove Private Zero Symbology Click (Object Sender, Event Argus E) {string text = this.dataTextBox.Text; This.dataTextBox.Text = text.Remove (0, 1); }

The examples below are not working. 

  MainForm MF = new mainform (); Mf.dataTextBox.Text = text.Remove (0, 1);   
 or  
  MainForm MF; Mf.dataTextBox.Text = text.Remove (0, 1);   
 does not work   
 
 
 try it,  
 in its main form;  
  Public MainForm () {InitializeComponent (); Main = this; } Internal Stable MainForm Main; Receive internal string position {return {return dataTextBox.Text.ToString ()}} set {dataTextBox.Text = value; }}   
 from your calling class,  
  MainForm.main.Status = "Your message";   
 :)

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