Dependency Injection design pattern

Question

Hi all,

In the following code I have implemented Dependency Injection design pattern; however, I am still confused about the correctioness of this implementation. This implementaation also includes Factory design pattern to inject dependent object. I want to know that can I implemtent Dependency Injection design pattern with out Factory design pattern.

I find ovet the internet but I dint find any pure implementation of Dependency Injection design pattern. Can any body reffre some good example.

public interface ILog
{
	void WriteLog();
}

public class LogIntoFile : ILog
{
	public void WriteLog()
	{

	}
}

public class LogIntoEventviewer : ILog
{
	public void WriteLog()
	{

	}	
}

public class LogIntoDatabase: ILog
{
	public void WriteLog()
	{

	}		
}

class LogFactory
{
	ILog objLogging;

	public static ILog CreateObject()
	{
		//Get type of object need to be created from configuration file
		String type = AppSettings["LoggingType"];

		ILog objLogging = null;

		switch(type)
		{
			case "LogIntoDatabase":
				objLogging = new LogIntoDatabase();
				break;
			case "LogIntoFile";
				objLogging = new LogIntoFile();
				break;
			case "LogIntoEventviewer";
				objLogging = new LogIntoEventviewer();
				break;
			default:
				break;		
		}
	
		return objLogging;
	}
}


public class DatabaseHelper
{
	var1, ..... varN;
	
	ILog objLogging;
	
	DatabaseHelper()
	{
		objLogging = LoggingFactory.CreateObject();
	}


	public void Insert(Object obj)
	{	
		/*TODO: insert code*/

		
		if (objLogging!=null)
			objLogging.WriteLog();
	}
}

Any help in this regards would be heighly appreciated.