Calculate current financial year

public static string GetCurrentFinancialYear()
{
int CurrentYear = DateTime.Today.Year;
int PreviousYear = DateTime.Today.Year - 1;
int NextYear = DateTime.Today.Year + 1;
string PreYear = PreviousYear.ToString();
string NexYear = NextYear.ToString();
string CurYear = CurrentYear.ToString();
string FinYear = null;

if (DateTime.Today.Month > 3)
FinYear = CurYear + "-" + NexYear;
else
FinYear = PreYear + "-" + CurYear;
return FinYear.Trim();
}