How to send a TextBox value to a variable in the parent form in C#?

I have an aboutBox control ("settings") that has a textBox in it. When the user presses the save button on this settings I want it to save the string from the textBox, pass it to a variable in the main form, close the settings box and then press
a button in the main form.
How would this be done?
Thank you!

what do u mean by "text saved in the textbox"?
if you mean to set the value into the Textbox in the form2
private void Form2_Loaded(object sender, EventArgs e)
this.TextBox1.Text =valueFromForm2;
2) When you click the save button on form2 it is already calling the delegate what do u mean by firing event?

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