Write a destructor

Write a method whose name is the same as the name of the class and is prefixed with a tilde (~). The method must not have an access modifier (such as public) and cannot have any parameters or return a value. For example:

class Example 
{ 
    ~Example() 
    { 
        ... 
    } 
}

Call a destructor

You can't call a destructor. Only the garbage collector can call a destructor.

Force garbage collection

Call System.GC.Collect.

Release a resource at a known point in time

Write a disposal method (a method that disposes of a resource) and call it explicitly from the program. For example:

class TextReader 
{ 
    ...  
    public virtual void Close()
    { 
        ...  
    } 
} 

class Example 
{ 
    void Use() 
    { 
        TextReader reader = ...;
        // use reader  
       reader.Close(); 
    } 
}

Release a resource at a known point in time in an exception-safe manner

Release the resource with a using statement. For example:

class TextReader : IDisposable 
{ 
    ...  
    public virtual void Dispose()
    { 
        // calls Close 
    } 
    public virtual void Close()
    { 
        ...  
    } 
}
 
class Example 
{ 
    void Use() 
    { 
        using (TextReader reader = ...) 
        { 
            // use reader 
        } 
    } 
}