Question

This is my code that i use:

Richtextbox.Text = Richtextbox.Text.Replace(ReplaceOldWord, ReplaceNewWord);

How do I know if the old word is replaced with new word or not….

Answer 1

Fist way is to check if text changed:

    String text = Richtextbox.Text.Replace(ReplaceOldWord, ReplaceNewWord);
    if(RichTextBox.Text != text)
    {
        Richtextbox.Text = text;
        DoSomething();
    }

The second is to use TextChanged Event. This event will rize only if richtextbox text changes.

public Form()
{
    InitializeComponent();
    RichTextBox.TextChanged += Richtextbox_TextChanged;
}

private void Richtextbox_TextChanged(object sender, EventArgs e)
{
    DoSomething();
}