First() always expects at least one element in result set, if there isn't any element is result, then First() returns an exception. While FirstOrDefault() is fine with a result set having 0 elements, it does not throw any exception

First() :- it always find at least one value from result set. if no value or more than one value then it will through exception. FirstOrDefault() :- return the first element from sequence or return the default value from result set. if no element is found then it will through exception.

Hi First() throw an exception when there is no record where as FirstOrDefault () does not throw an exception.So we can say First() does not support Null value where as FirstOrDefault support Null values

@Rahul I see your multiple and same replies, keep only one and delete others

Hi First() throw an exception when there is no record where as FirstOrDefault () does not throw an exception.So we can say First() does not support Null value where as FirstOrDefault support Null values

Hi First() throw an exception when there is no record where as FirstOrDefault () does not throw an exception.So we can say First() does not support Null value where as FirstOrDefault support Null values

Hi First() throw an exception when there is no record where as FirstOrDefault () does not throw an exception.So we can say First() does not support Null value where as FirstOrDefault support Null values

Hi First() throw an exception when there is no record where as FirstOrDefault () does not throw an exception.So we can say First() does not support Null value where as FirstOrDefault support Null values

Hi First() throw an exception when there is no record where as FirstOrDefault () does not throw an exception.So we can say First() does not support Null value where as FirstOrDefault support Null values

Hi First() throw an exception when there is no record where as FirstOrDefault () does not throw an exception.So we can say First() does not support Null value where as FirstOrDefault support Null values

Hi First() throw an exception when there is no record where as FirstOrDefault () does not throw an exception.So we can say First() does not support Null value where as FirstOrDefault support Null values

Hi First() throw an exception when there is no record where as FirstOrDefault () does not throw an exception.So we can say First() does not support Null value where as FirstOrDefault support Null values

Hi First() throw an exception when there is no record where as FirstOrDefault () does not throw an exception.So we can say First() does not support Null value where as FirstOrDefault support Null values

Hi First() throw an exception when there is no record where as FirstOrDefault () does not throw an exception.So we can say First() does not support Null value where as FirstOrDefault support Null values

Hi First() throw an exception when there is no record where as FirstOrDefault () does not throw an exception.So we can say First() does not support Null value where as FirstOrDefault support Null values

First()- their are at least one element in sequence FirstOrDefault()- you are checking wither their is any element in sequence.