Answer Posted / abdul

Convert.ToString handles null where as simple
variable.ToString() doesn;t;

But Convert class is an optimization cost, when we use
inside any loop, need to minimize it

Sample ToString();

Will Work
int salary = 10000;
string oldSalary = salary.tostring();

Will Throw exeption
int salary = null;
string oldSalary = salary.tostring(); ---> throws exception

Sample Convert.ToString()
Will Work
int salary = 10000;
string oldSalary = Convert.ToString(salary);

Will Work
int salary = null;
string oldSalary = Convert.ToString(salary); null will return

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