c# - How can I replace text in RichTextBox form another form? -

so have richtextbox called richtextbox1, in form named xmleditor want able rename chosen word in parts of rich text box want. (like find , replace in notepad).

but want use form called find (it looks find & replace in notepad) have functions replace words in richtextbox1 in xmleditor.

the form named find has 2 textboxes , 1 button. first textbox named textbox1 used choose text replace while textbox3 text replaced with. , button button3 replace text while clicked.

how can replace text in richtextbox form? how can these forms?

void button3_click(object sender, eventargs e) {     xmleditor xmle = new xmleditor();     xmle.richtextbox1.text = xmle.richtextbox1.text.replace(textbox1.text, textbox3.text); } 

one thing can pass xmleditor form parameter when constructing find, , have public xmleditor method can used interaction.

interface ifindandreplace {     void replace(string s); }  public class xmleditor : ifindandreplace {     ...     public void showfindandreplaceform() {         find findform = new find(this);     }     public void replace(string s) {         //replace method here     } }  public class find {     ifindandreplace parent;     public find(ifindandreplace parent) {         this.parent = parent;     }     public replace(string s) {         parent.replace(s);         //this call replace on parent form.     } } 

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edited use interfaces :)