Difference between Convert.ToInt32,Int32.parse,Int32.TryParse

    'input = Int32.Parse(TextBox1.Text)

    'input = Convert.ToInt32(TextBox1.Text)

    If Int32.TryParse(TextBox1.Text, input) = False Then
      MessageBox.Show("Invalid input", "Input Error", MessageBoxButtons.OK, MessageBoxIcon.Error)

Difference between Convert.ToInt32,Int32.parse,Int32.TryParse

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 nullreference, it will throw ArgumentNullException. If s is other thaninteger value, it will throw FormatException. When s represents a number less than MinValue or greater than MaxValue, it will throwOverflowException. For example:

 Collapse | Copy Code

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 

Convert.ToInt32(string)

Convert.ToInt32(string s) method converts the specified stringrepresentation of 32-bit signed integer equivalent. This calls in turnInt32.Parse () method. When s is a null reference, it will return 0rather than throw ArgumentNullException. If s is other than integervalue, it will throw FormatException. When s represents a number less than MinValue or greater than MaxValue, it will throwOverflowException. For example:

 Collapse | Copy Code

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

Int32.TryParse(string, out int)

Int32.Parse(string, out int) method converts the specified stringrepresentation 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 integervalue, the out variable will have 0 rather than FormatException. Whens represents a number less than MinValue or greater than MaxValue, theout variable will have 0 rather than OverflowException. For example:

 Collapse | Copy Code

 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 

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.