Difference between Object.ToString() and Convert.ToString()

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Can anyone tell me, What is the Difference between Object.ToString() and Convert.ToString()?

please don't put links over here....
Thanks in advance

Posted 15-May-11 23:26pm

parmar_punit

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Solution 4

Object.ToString() return value of ToString() method if overriden in Class otherwise it will return Object Type, as all class inheriting from Object Class.

Convert.ToString(), converts to a particular format.

Regards
Rushi

Posted 15-May-11 23:42pm

Joshi, Rushikesh

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Hemant__Sharma · Accepted Answer · 2011-05-15T23:32:00

http://social.msdn.microsoft.com/forums/en-US/architecturegeneral/thread/bf118337-6dbd-4edd-9147-fbbcba7ce6c5/[^]

Well i saw lot of people saying object.ToString() doesn't handle Null values, i'll say if it's null it cannot handle anything. i.e.

object a = null;
a.AnyFunction();

this will raise an exception because object reference is not set to an instance of an object it has nothing to do with ToString() method. it's the CLR who will raise the exception because the object is null

on the other hand Convert is a helper class which has a function ToString and the function body is something like this:
updated: after @parmar_punit's comment.

public static string ToString(object obj)
{
    if(obj !=null)
    {
        return obj.ToString();
    }
return String.Empty;
}

Edit:
one more thing if the object in object.Tostring() is value type there will be no difference becasue value member got there memory intitialized at time of declaration if they are not declared as null.

Thanks,
Hemant

Pratik Bhesaniya · Accepted Answer · 2011-05-15T23:38:00

The Basic Difference is that,

Object.ToString() not Handle Null Values where as Convert.ToString() can handle Null Values.That means Convert.Tostring() will not generate Null Refernce Exception where as Object.ToString() will generate Null Refernce Exception if you are trying to do .ToString() on object which is NULL.

Example :

MIDL

nt x =0;
string s=x.ToString();
string Str=Convert.ToString(x);

MSIL

Here We can convert the integer "x" using "x.ToString()" or "Convert.ToString()" . But only The basic difference between them is "Convert" function handles NULLS while "x.ToString()"
does not it will throw a NULL reference exception error. So as for good programming practice using "Convert" is always safe.

For More Information refer below link:

[^]

Mahendra.p25 · Accepted Answer · 2011-05-15T23:39:00

As You said No Links. But instead of Putting this Question here You Can Simply Do Let Me google [^]

This first ans would be same as ans given below..... Or n Number Of ans..

There is a simple but important difference between these three…

ToString() raise exception when the object is null

So in the case of object.ToString(), if object is null, it raise NullReferenceException.

Convert.ToString() return string.Empty in case of null object

(string) cast assign the object in case of null

So in case of
MyObject o = (string)NullObject;

But when you use o to access any property, it will raise NullReferenceException.

Difference between Object.ToString() and Convert.ToString()

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