difference between Convert.ToInt32 and Int32.Parse?

Int32.parse(string)

Int32.Parse(string s) method converts the string representation of a number to its 32-bit signed integer equivalent.

• When s is a null reference, it will throw ArgumentNullException.
• If s is other than integer value, it will throw FormatException.
• When s represents a number less than MinValue or greater than MaxValue, it will throw OverflowException.

For example:

string s1 = "1234"; 
string s2 = "1234.65"; 
string s3 = null; 
string s4 = "123456789123456789123456789123456789123456789"; 

int result; 
bool success; 

result = Int32.Parse(s1); //-- 1234 
result = Int32.Parse(s2); //-- FormatException 
result = Int32.Parse(s3); //-- ArgumentNullException 
result = Int32.Parse(s4); //-- OverflowException 

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Convert.ToInt32(string)

Convert.ToInt32(string s) method converts the specified string representation of 32-bit signed integer equivalent. This calls in turn Int32.Parse() method.

• When s is a null reference, it will return 0 rather than throw ArgumentNullException.
• If s is other than integer value, it will throw FormatException.
• When s represents a number less than MinValue or greater than MaxValue, it will throw OverflowException.

For example:

result = Convert.ToInt32(s1); //-- 1234 
result = Convert.ToInt32(s2); //-- FormatException 
result = Convert.ToInt32(s3); //-- 0 
result = Convert.ToInt32(s4); //-- OverflowException 

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Int32.TryParse(string, out int)

Int32.Parse(string, out int) method converts the specified string representation of 32-bit signed integer equivalent to out variable, and returns true if it is parsed successfully, false otherwise. This method is available in C# 2.0.

• When s is a null reference, it will return 0 rather than throw ArgumentNullException.
• If s is other than an integer value, the out variable will have 0 rather than FormatException.
• When s represents a number less than MinValue or greater than MaxValue, the out variable will have 0 rather than OverflowException.

For Example :

success = Int32.TryParse(s1, out result); //-- success => true; result => 1234 
success = Int32.TryParse(s2, out result); //-- success => false; result => 0 
success = Int32.TryParse(s3, out result); //-- success => false; result => 0 
success = Int32.TryParse(s4, out result); //-- success => false; result => 0 

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Conclusion

Convert.ToInt32() is better than Int32.Parse() since it returns 0 rather than an exception. But again, according to the requirement, this can be used. TryParse will be the best since it always handles exceptions by itself.