Adding an event handler for a control in child form from parent form in C#

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You can add event in child form and rise it when text changed. Then create event handler in parent form and change text in parent form.
In child form:

public event EventHandler OnChildTextChanged;
private void textBox1_TextChanged(object sender, EventArgs e)
{
    if(OnChildTextChanged != null)
       OnChildTextChanged(textBox1.Text, null);
}

In parent form:

private void button1_Click(object sender, EventArgs e)
{
    ChildForm child = new ChildForm();
    child.OnChildTextChanged += new EventHandler(child_OnChildTextChanged);
    child.ShowDialog();
}

void child_OnChildTextChanged(object sender, EventArgs e)
{
    textBox1.Text = (string)sender;
}

Hope it helps.

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