An interface contains only the declaration of the methods, properties, and events, but not the implementation. It is the responsibility of the deriving class to implementation for all the members of the interface. By using Interface make easy to maintain a program. In C#, an interface can be defined using the interface keyword. For example, the following is a simple interface:
A StringBuilder object is not a string StringBuilder object used for manipulating characters. StringBuilder object is mutable it means once we create string builder object we can perform any operation like insert, append, remove, and replace without creating new instance for every time.
Knockout provide client-side validation by using extender. It notifying to user when that value changes of input fields (input, textarea, select). The following demo Knockout validation via extender.
The SQL truncate table command is used to remove all rows (complete data) from a table. It is similar to delete statement , delete statement can use where clause but truncate statement can not use where clause.
The SQL DISTINCT keyword is used with the SELECT statement to eliminate the duplicate records and return only unique records. There may be a case when you have multiple duplicate records in a table. While getting such records, it will get only unique records instead of getting duplicate records.