c# - FormatException was unhandled Input string was not in a correct format -


i want int value database. have error formatexception unhandled input string not in correct format.

my code 

       string str = doc_cell.text;        ulong = convert.touint64(str);

the problem comes because string convert not uint64, because of line throws exception.

you should write this:

uint64 =0; bool issuccess = uint64.tryparse(str, out a);

in case have value of string in a, if parsing successful. if parsing not have 0 in a.


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