Reference Type

String in .NET id 'Reference Type'.The reason is quite 
simple.All classes in the .NET Environment are 'Reference 
Type' & 'String' is a Class in .NET (not DataType as in VB 
6.0)

string is a value type...not reference type....we ll not 
create an (instance) for that one...

String is Referenced Type and stored in the Heap....

run this code : to see that string is reference type


        SByte a = 0;
        Byte be = 0;
        Int16 c = 0;
        Int32 d = 0;
        Int64 ee = 0;
        String s = "";
        Exception ex = new Exception();

        object[] Types = { a, be, c, d, ee, s,ex };

        foreach (object obj in Types)
        {
            string type;
            if (obj.GetType().IsValueType)
                type = "Value Type";
            else
                type = "Reference Type";
            Response.Write(type);    
        }

string is a reference type.

string str = "hello";
char x = str[1];

here what we do is handling the memory.
which type allows you to handle the memory is reference types.

String is a reference type. If two string variable has the 
same string it stored in the same heap memory address.

eg in VB.Net 
Dim a as string="Hello"
dim b as string="Hello"

both variable refer to same memory address. As strings are 
immutable reference type you can't get the change in one 
variable to another.

string  is value type by nature. it does not follow rules 
of reference type. eg  

        string MyName1 = "chandrapal Singh";
        string MyName2;
        
        MyName2 = MyName1;
        MyName2 = "deepak";

Response.Write("MyName1 :" + MyName1 + " MyName2 :" + 
MyName2);

This gives Output
MyName1 :chandrapal Singh MyName2 :deepak

if this is reference type then the output should be 
MyName1 :deepak MyName2 :deepak