Editing a RichTextBox from another class. [RESOLVED]

[deranged]

So far, I have a richTextBox made with Visual Studio (Named richTextBox1). I have a separate class that needs to change the text in the box. The textbox is in class Form1.

So far, what I have is :

In class Form1

		public void txtchange(string changeinfo)
		{
			richTextBox1.Text += "\n" + changeinfo;
		}

and in the other class, I have

Form1.txtchange("blah blah");

The error it gives me on build is:

Form1.cs(214): An object reference is required for the nonstatic field, method, or property 'GUIbot.Form1.txtchange(string)'

[jmcilhinney]

Your methos is declared as "public", so you need to call it on an instance of the Form1 class, not using the class name itself. You use just the class name for members declared as "static" only. You need to call your function on the actual Form1 object that contains the RichTextBox you want to edit. Something like this:

Form1 myForm = new Form1();

myForm.txtchange("blah blah");

If you are currently creating an instance of the Form1 class and naming it Form1, I suggest you change the name to something more descriptive. It is considered bad practice to name an object instance with the class name, i.e.

Form1 Form1 = new Form1();

is bad.

Also, it is obviously up to you but I'd suggest changing the name of your method. "txtchange" suggests a TextBox. "ChangeText" would be a more appropriate name, but this may also imply that it changes the Text property of the form. "ChangeRichText" would be a more appropriate name still. Given that you are actually appending a line of text, rather than just changing the text, "AppendRichTextLine" would probably be the most appropriate name.

[deranged]

Thanks a lot. That completely solved the problem.