title: Saving the default value of a textbox c#
body: <p>I'm creating a bit of a calculator type program.</p>
  
  <p>I have a textbox which the user can change the value of. This textbox is used in some of the calculations.</p>
  
  <p>How do i save the value of a textbox so that the next time the form opens the text box holds that value. </p>
  
  <p>For example the textbox default is 1.5. The user changes it to 5 and then closes the form. The next time the user opens the form the textbox default is now 5 not 1.5</p>
  
  <p>Any help would be appreciated Im new at this</p>