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TryParse strInMax , out outRes. WriteLine "Converted values using Int TryParse method" ; Console. TryParse method" ;. Like this: Like Loading Previous Previous post: Tuple Types in C. Next Next post: Usage of String. Format Method in C. Thanks a lot for this. This post helped me understand int. TryParse Loading Leave a Reply Cancel reply. Loading Comments Email Required Name Required Website. A bit signed integer that is equivalent to value , or zero if value is null. The following example defines a class that implements IConvertible and a class that implements IFormatProvider.

Objects of the class that implements IConvertible hold an array of Double values. An object of each class is passed to the ToInt32 method. This method returns an average of the array of Double values, using the object that implements IFormatProvider to determine how to calculate the average.

The return value is the result of invoking the IConvertible. ToInt32 method of the underlying type of value. For example, if value is a String that represents a number, provider could supply culture-specific information about the notation used to represent that number. The base types ignore provider ; however, the parameter may be used if value is a user-defined type that implements the IConvertible interface.

The following example defines a custom NumberFormatInfo object that recognizes the string "pos" as the positive sign and the string "neg" as the negative sign. It then attempts to convert each element of a numeric string array to an integer using both this provider and the NumberFormatInfo provider for the invariant culture.

The return value is the result of invoking the Int Parse method on value. The NumberFormatInfo object provides culture-specific information about the format of value. If provider is null , the NumberFormatInfo for the current culture is used. The base of the number in value , which must be 2, 8, 10, or The exception message indicates that there are no digits to convert if the first character in value is invalid; otherwise, the message indicates that value contains invalid trailing characters.

If fromBase is 16, you can prefix the number specified by the value parameter with "0x" or "0X". Because the negative sign is not supported for non-base 10 numeric representations, the ToInt32 String, Int32 method assumes that negative numbers use two's complement representation. In other words, the method always interprets the highest-order binary bit of an integer bit 31 as its sign bit. As a result, it is possible to write code in which a non-base 10 number that is out of the range of the Int32 data type is converted to an Int32 value without the method throwing an exception.

The following example increments Int MaxValue by one, converts the resulting number to its hexadecimal string representation, and then calls the ToInt32 String, Int32 method. Instead of throwing an exception, the method displays the message, "0x converts to Dima Kozyr Dima Kozyr 3, 9 9 gold badges 30 30 silver badges 64 64 bronze badges.

When you hit Edit the proper productId more than likely isn't transmitted. Modify the int productId to int? Which will let you either handle the null before continue or figure out why you aren't always passing a valid id to Edit.

You can try define ProductID as int? No aevitas its a required parameter, its to edit a resource, do not make it nullable. Stop suggesting bad design. Phill Interestingly said bad design got accepted as an answer. Add a comment. Active Oldest Votes. ProductId now it will not throw error. Improve this answer. Ehsan Sajjad Ehsan Sajjad It helped. Thanks to everybody.

I have the following code v. ToString ; when the database field is null, it throw an exception. Wednesday, October 29, PM. User posted A DataReader does not return a null if the database field is null.

User posted looks like you'll have to declare a temporary integer variable to use with the TryParse. Thursday, October 30, PM. User posted try using TryParse as it does not throw an exception if the parse fails. But yeah tryparse would be better.