How can use Split function in C#

I want split 2009-2010 in year format like: 2009

INPUT :   2009-2010  (financialYear)

OUTPUT: 2009


  char[] splitter1 = { '-' };
            string[] year1 = financialYear.Split(splitter1);
            int str1 = Convert.ToInt32(year1[0].ToString());
         
str1 give result: 2009