In C# there are different data type and they use some default value when we declare a variable. When we define a variable of type int or Int32 say int score; so what is the value of score, will it be null or zero, in the same way if we create a variable of type string/String what value it holds by default. I was working on a project and used following code
int score; If (somecondition == true) score = somevalue;
And I was expecting if condition is true then score will be assigned otherwise it would be null but I was wrong because default value for an int variable is zero (0). Finally I changed my code, and forcibly make my score variable to nullable.
Int? score; If (somecondition == true) score = somevalue;
On the other hand String is by default null and not an empty string also string not a value type in C# but its a reference type.
Here is the some mostly used data type and their default values
DATE TYPE | DEFAULT VALIE ------------------------------------ String | null bool | false char | '\0' decimal | 0.0M double | 0.0D enum | The value produced by the expression (E)0, where E is the enum identifier. float | 0.0F int | 0 long | 0L sbyte | 0 short | 0 struct | The value produced by setting all value-type fields to their default values and all reference-type fields to null. uint | 0 ulong | 0 ushort | 0
Having 13+ years of experience in Microsoft Technologies (C#, ASP.Net, MVC and SQL Server). Worked with Metaoption LLC, for more than 9 years and still with the same company. Always ready to learn new technologies and tricks.
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