Class Extension Method

/// <Summary>
/// 1. Add the extension method step 1. Add a static class with the class name
/// The static class should be in the namespace where the extension method will be used in the future. Even if the namespace is different, the namespace must be imported when used. Otherwise, the namespace cannot be used.
/// </Summary>
Public static class methodext
{
// 2. Add a static method to the static class
// The first parameter of the static method indicates the type of the extension method to be added.
// The first modifier This is required. The OBJ here indicates the object that will call this method in the future.
Public static void sayhello (this person OBJ)
{
Console. writeline ("Hello ^ _~ "+ Obj. Name );
}
}

Class Extension Method