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Difference between Convert.tostring and .tostring() method Example

In this article I will explain differences between .tostring() and Convert.tostring() in asp.net. 

The basic difference between them is “Convert.ToString(variable)” handles NULL values even if variable value become null but “variable.ToString()” will not handle NULL values it will throw a NULL reference exception error. So as a good coding practice using “convert” is always safe.
A Small Example as follws 

//Returns a null reference exception for str.

string string1;
object s1i = null;
string1= i1.ToString();

//Returns an empty string for str and does not throw an exception. If you dont

string string2;
object i = null;
string2= Convert.ToString(i);
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