Is object a reference type or value type?
c#, object, oop, reference-type, value-type
Solution
It is a reference type
Doing an example with string isn't very illuminating, because string is also a reference type (as is `SampleClass`, obviously); your example contains zero "boxing".
if object is reference type then why obj2 value is still "OldString"
Why wouldn't it be? When you create a new string, that doesn't change old references to point at the new string. Consider:
object obj1 = "OldString";
// create a new string; assign obj1 the reference to that new string "OldString"
object obj2 = obj1;
// copy the reference from obj1 and assign into obj2; obj2 now refers to
// the same string instance
obj1 = "NewString";
// create a new string and assign that new reference to obj1; note we haven't
// changed obj2 - that still points to the original string, "OldString"
Problem
I have still doubts about `object`. It is the primary base class of anything, any class. But is it reference type or value type. Or like which of these acts it? I need to get this clarified. I have difficulty understanding that. ``` object obj1 = "OldString"; object obj2 = obj1; obj1 = "NewString"; MessageBox.Show(obj1 + " " + obj2); //Output is "NewString OldString" ``` In this case it acts like a value type. If object was reference type then why obj2 value is still "OldString" ``` class SampleClass { public string Text { get; set; } } SampleClass Sample1 = new SampleClass(); Sample1.Text="OldText"; object refer1 = Sample1; object refer2 = refer1; Sample1.Text = "NewText"; MessageBox.Show((refer1 as SampleClass).Text + (refer2 as SampleClass).Text); //OutPut is "NewText NewText" ``` In this case it acts like reference type We can deduce that `object`'s type is what you box inside it. It can be both a reference type and value type. It is about what you box inside. Am I right?