title: How to stop Excel-DNA function from calculating while inputting values
body: <p>I have implemented some elaborate and computationally expensive function in c#. To use it in Excel I have created an Excel-AddIn via Excel-DNA.</p>
  
  <p>Now when I call the function within Excel and start inputting values it starts calculating even before I have finished giving it all the inputs. What is more, when I click into the cell and change some of the inputs the function also recalculates. Usually I wouldn't mind. But due to the slow performance it turns working into an ordeal</p>
  
  <p>Is there a way to suppress this behavior ? (Setting calculation to manual doesn't seem to work) Basically I want the Excel-DNA formulas to (re)calculate only when F9 is pressed. </p>
  
  <p>If anyone has a solution in another language I will gladly use it as an inspiration and port it to c#.</p>