Sea trying to change the RichTextBox does not work ?

Question

Drag and drop RichTextBox into form in the Form_Load and his running assign content for events RichTextBox_TextChanged RichTextBox but not running although I have to add this line of code:

this.RichTextBox.TextChanged + = new System.EventHandler (this.RichTextBox_TextChanged);

before Form_Load

[CODE]

public Form1()

{

InitializeComponent();

this.RichTextBox.TextChanged + = new System.EventHandler (this.RichTextBox_TextChanged);

this.Load += new System.EventHandler(this.Form1_Load);

}

private void RichTextBox_TextChanged (object sender, System.EventArgs e)

{

do something ...

}

[/ CODE]

as an example of his small examples on running normally, but in the main program will not run, I do not know what is not right ? What advice can you help me fix this.