How can I fix the error : “Unreachable Code Detected”

Question

public partial class KalenderLeeftijd : System.Web.UI.Page
{
protected void Page_Load(object sender, EventArgs e)
{

}
protected void calBirthDate_SelectionChanged(o         


        

Answer 1

The return statement terminates the execution of a function and returns control to the calling function. Execution resumes in the calling function at the point immediately following the call

If no return statement appears in a function definition, control automatically returns to the calling function after the last statement of the called function is executed

In Your Code :

private int CountLeapYears(DateTime startDate)
{
    int count = 0;
    for (int year = startDate.Year; year <= DateTime.Now.Year; year++)
    {
        if (DateTime.IsLeapYear(year))
        {
            DateTime february29 = new DateTime(year, 2, 29);
            if (february29 >= startDate && february29 <= DateTime.Now.Date)
            {
                count++;
            }
        }
    }
    return count;//The Execution will be terminated here,the next lines will become unreachable 
    **String** answer = GetAnswer();
    Response.Write(lblAntwoord); 
}
}

MSDN LINK :

C : https://msdn.microsoft.com/en-us/library/sta56yeb.aspx

c# : https://msdn.microsoft.com/en-us/library/1h3swy84.aspx