What's the main difference between int.Parse() and Convert.ToInt32

string str = "199"

int.Parse(str)

• This method converts the string to integer. 
• If string variable 'str' is null, then it will throw ArgumentNullException. 
• If string 'str' has out of integer ranges, then it will throw OverflowException.
• If string 'str' is other than integer value, then it will throw FormatException. 

Convert.ToInt32(str)

• This method converts the string to integer. 
• If string str is null, then it will return 0 rather than throw ArgumentNullException.
• If string str represents out of integer ranges, then it will throw OverflowException. 
• If string str is other than integer value, then it will throw FormatException.