What is the difference between a reference type and value type in c#?

Question

Some guy asked me this question couple of months ago and I couldn\'t explain it in detail. What is the difference between a reference type and a value type in C#?

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Answer 1

Suppose v is a value-type expression/variable, and r is a reference-type expression/variable

    x = v  
    update(v)  //x will not change value. x stores the old value of v

    x = r 
    update(r)  //x now refers to the updated r. x only stored a link to r, 
               //and r can change but the link to it doesn't .

So, a value-type variable stores the actual value (5, or "h"). A reference-type varaible only stores a link to a metaphorical box where the value is.