//reference for navigation buttons - https://www.c-sharpcorner.com/code/3700/form-navigation-in-c-sharp-windows-form-application.aspx
private void addQuoteButton_Click(object sender, EventArgs e)
{
/*
* AddQuote AQ = new AddQuote();
* AQ.Show();
* this.Hide();
*/
AddQuote AQ = new AddQuote();
AQ.Tag = this;
AQ.Show(this);
Hide();
}