How to convert a "Date" type array to a "String" type array (VB)

My Code:

listDates = (From row In ds.Tables(0) Select row.Field(Of Date)("Check In")).ToList
arrDates = listDates.ToArray
  For a = 0 To arrDates.Length - 1
     arrDatesStr(a) = (arrDates(a)).ToString

I am making an analytics form to find the most popular month for a hotel:

  • listDates is a list that stores all of the dates from the database
  • arrDates is the conversion of listDates to an array
  • arrDatesStr is the array I need to fill with the date values but as strings, so i can substring the month

I have checked the values in listDates and arrDates and they conversion is successful, but when I try to convert it to string it says

"System.NullReferenceException: 'Object reference not set to an instance of an object.'"

How do I convert arrDates to a string and input those values into arrDatesStr?

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