vb.net subtraction giving error message for subtracting two numbers -

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i trying use code in vb.net

num_days = todate_split(0) - fromdate_split(0)

to find out number of days between. example, todate_split(0) equals 20 , fromdate_split(0) equals 5 should return 15

but error saying:

operator '-' not defined types 'char' , 'char'

update:

i using code too:

fromdate_split.split("/")

to split strings

they in date format, example 30/12/2015

and want difference between 2 dates (days)

what want parse dates , timespan:

dim todate datetime = datetime.parse(todatestring) dim fromdate datetime = datetime.parse(fromdatestring)  dim diff timespan = todate - fromdate

this way number of days with:

dim days int32 = diff.days

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