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c# - How can I pass values from one form to another?

Consider the situation where I have two windows forms, say F1 and F2. After using F1, I have now called F2.ShowDialog(). This puts F2 on the screen as well. Now that both forms are visible, how can I pass data from F1 to F2? Additionally, once F2 (A modal dialog) finishes, how can I return data to F1?

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Has anyone considered simply passing the value to the form in the tag attribute.

Form newForm = new form();
newForm.Tag = passValue;
newform.showmodal();

when newform is shown the load (or any other) routine can use the data in tag

public void load()
{
  if (this.Tag.length > 0)
  {
     // do something with the data
  }
}

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