If element exists/wait for when using PageFactory with C#

Hi,

I need to click an okay button which might appear after completing a field - it might take 5 seconds to appear. So i need IF Wait for existence 5 seconds. I'm using C# PageFactory as well.

Code:

FindsBy(How = How.Name, Using = "OK")]
private IWebElement alertOKBtn;

public void PopulateFields //method to populate the form
{
     // Populate fields
     dateFromField.SendKeys(DateTime.Now.ToString("dd/MM/yyyy HH:mm:ss"));
     // Click on this field
     descriptionField.Click();
    
     //OK button might appear, might take 5secs - pseudcode
     if ( alertOKBtn exists, wait for it for 5 secs.. )
     {
         alertOkBtn.Click();
     }

     //continue populating form

}

Not sure how to do the If element exists, i could just put a 5 second sleep before the IF statement button but I wondered if there was a better way to check for both?

TIA