FormatException Input string was not in a correct formatSystemNumberStringToNumber SystemString str SystemGlobalizationNumberStyles options SystemNumber+NumberBuffer& number SystemGlobalizationNumberF

This error occurs when a program is trying to convert a string into an integer, but the string is not in the correct format. This can happen when the string contains non-numeric characters or when it is too large or too small to be represented as an integer. To fix this error, ensure that the input string is in the correct format before attempting to convert it into an integer.