Obsolete is an attribute which is used to mark a member of class or class that is no longer in use. You can pass a custom message to this attribute which will be shown when calling these members or class.
[Obsolete("This method is no longer in use! instead use isNumericNew")] public int isNumeric() { //Code here } public int isNumericNew() { //Code here }
When you will call isNumeric() method. It will show you custom warning as “This method is no longer in use! instead use isNumericNew”.
Note: In Obsolete keyword “O” should be in capital letter.