Why there is need of value type and ref type

Rohit

10y721Visual Basic .NET

please help me on below topic

in c# there are already built in data type like int,float,char,string

then why there is need of value type and reference type

please tell me

3 Replies

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Manas Mohapatra10y ago
Accepted answer
ValueType: When you declare a value, it creates in single space in memory. It creates in STACK location in memoryExamples are int, float, double, bool, char etc.

RefernceType: When you declare as reference type it creates object in rutime which helps in garbage collection. It creates in HEAP location in memory.Examples are String, creating custom objects

Go through below links:

http://www.codeproject.com/Articles/76153/Six-important-NET-concepts-Stack-heap-value-types

http://www.albahari.com/valuevsreftypes.aspx

http://www.c-sharpcorner.com/uploadfile/e7ad16/reference-type-and-value-type-in-C-Sharp/
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Vinay Singh10y ago
Hi
As we knowint, bool and float are specific types, interfaces and delegates are kinds of type - just like struct and enum are kinds of value types.
Pleaseexplanation of reference types and value types in this article. I'd be happy to expand on any bits which you find confusing.
The "TL;DR" version is to think of what the value of a variable/expression of a particular type is. For a value type, the value is the information itself. For a reference type, the value is a reference which may be null or may be a way of navigating to an object containing the information.
For example, think of a variable as like a piece of paper. It could have the value "5" or "false" written on it, but it couldn't have my house... it would have to have directions to my house. Those directions are the equivalent of a reference. In particular, two people could have different pieces of paper containing the same directions to my house - and if one person followed those directions and painted my house red, then the second person would see that change too. If they both just had separatepictures of my house on the paper, then one person colouring their paper wouldn't change the other person's paper at all.
for more detail have a look of the link
https://msdn.microsoft.com/en-us/library/t63sy5hs.aspx
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Nitin Sontakke10y ago
The data types you mentioned int, float, char are actually value types. However, in most cases you cannot only with these while write applications. You need complex types, such as Customer, Invoice, etc. These are constructed by using intrinsic value types. The complex types are reference types. The reason these are reference types is because every complex type have a different memory requirement so it cannot be stored on stack.
For detailed and exceptionally good explaination of this watch C# videos from Jamie King on YouTube.
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