Int16.Parse Method (String, NumberStyles)
Converts the string representation of a number in a specified style to its 16bit signed integer equivalent.
Assembly: mscorlib (in mscorlib.dll)
Parameters
 s

Type:
System.String
A string containing a number to convert.
 style

Type:
System.Globalization.NumberStyles
A bitwise combination of the enumeration values that indicates the style elements that can be present in s. A typical value to specify is NumberStyles.Integer.
Exception  Condition 

ArgumentNullException  s is null. 
ArgumentException  style is not a NumberStyles value. or style is not a combination of AllowHexSpecifier and HexNumber values. 
FormatException  s is not in a format compliant with style. 
OverflowException 
The style parameter defines the style elements (such as white space or a sign symbol) that are allowed in the s parameter for the parse operation to succeed. It must be a combination of bit flags from the NumberStyles enumeration. Depending on the value of style, the s parameter may include the following elements:
[ws][$][sign][digits,]digits[.fractional_digits][e[sign]digits][ws]
Or, if style includes AllowHexSpecifier:
[ws]hexdigits[ws]
Items in square brackets ([ and ]) are optional. The following table describes each element.
Element  Description 

ws  Optional white space. White space can appear at the beginning of s if style includes the NumberStyles.AllowLeadingWhite flag, or at the end of s if style includes the NumberStyles.AllowTrailingWhite flag. 
$  A culturespecific currency symbol. Its position in the string is defined by the NumberFormatInfo.CurrencyPositivePattern and NumberFormatInfo.CurrencyNegativePattern property of the current culture. The current culture's currency symbol can appear in s if style includes the NumberStyles.AllowCurrencySymbol flag. 
sign  An optional sign. The sign can appear at the beginning of s if style includes the NumberStyles.AllowLeadingSign flag, and it can appear at the end of s if style includes the NumberStyles.AllowTrailingSign flag. Parentheses can be used in s to indicate a negative value if style includes the NumberStyles.AllowParentheses flag. 
digits  A sequence of digits from 0 through 9. 
,  A culturespecific thousands separator symbol. The current culture's thousands separator symbol can appear in s if style includes the NumberStyles.AllowThousands flag. 
.  A culturespecific decimal point symbol. The current culture's decimal point symbol can appear in s if style includes the NumberStyles.AllowDecimalPoint flag. 
fractional_digits  A sequence of the 0 digit. Fractional digits can appear in s if style includes the NumberStyles.AllowDecimalPoint flag. If any digit other than 0 appears in fractional_digits, the method throws an OverflowException. 
e  The 'e' or 'E' character, which indicates that s can be represented in exponential notation. The s parameter can represent a number in exponential notation if style includes the NumberStyles.AllowExponent flag. However, the s parameter must represent a number in the range of the Int16 data type and cannot have a nonzero fractional component. 
hexdigits  A sequence of hexadecimal digits from 0 through f, or 0 through F. 
A string with digits only (which corresponds to the NumberStyles.None style) always parses successfully. Most of the remaining NumberStyles members control elements that may be but are not required to be present in this input string. The following table indicates how individual NumberStyles members affect the elements that may be present in s.
Noncomposite NumberStyles values  Elements permitted in s in addition to digits 

Decimal digits only.  
The . and fractional_digits elements. However, fractional_digits must consist of only one or more 0 digits or an OverflowException is thrown.  
The s parameter can also use exponential notation.  
The ws element at the beginning of s.  
The ws element at the end of s.  
A sign can appear before digits.  
A sign can appear after digits.  
The sign element in the form of parentheses enclosing the numeric value.  
The , element.  
The $ element. 
If the NumberStyles.AllowHexSpecifier flag is used, s must be the string representation of a hexadecimal value without a prefix. For example, "9AF3" parses successfully, but "0x9AF3" does not. The only other flags that can be present in style are NumberStyles.AllowLeadingWhite and NumberStyles.AllowTrailingWhite. (The NumberStyles enumeration has a composite number style, NumberStyles.HexNumber, that includes both white space flags.)
The s parameter is parsed using the formatting information in a NumberFormatInfo object that is initialized for the current system culture. For more information, see NumberFormatInfo.CurrentInfo. To parse s using the formatting information of a specific culture, call the Int16.Parse(String, NumberStyles, IFormatProvider) method.
Available since 8
.NET Framework
Available since 1.1
Portable Class Library
Supported in: portable .NET platforms
Silverlight
Available since 2.0
Windows Phone Silverlight
Available since 7.0
Windows Phone
Available since 8.1