Log4j

I have written a simple Java class and inlcuded log4j.jar in the classpath.

In log4j.properties I have written
log4j.rootCategory=DEBUG, C:\\logger.txt
log4j.appender.dest1=org.apache.log4j.ConsoleAppender
log4j.appender.dest1.layout=org.apache.log4j.PatternLayout

and in my class I have written

import org.apache.log4j.*;

public class myclass {
      static Logger logger = Logger.getLogger(myclass .class);

public static void main(String[] args) {
logger.debug("111111111111111111111111111");
}

But I am getting the following error

log4j:ERROR Could not find value for key log4j.appender.C:\logger.txt
log4j:ERROR Could not instantiate appender named "C:\logger.txt".
log4j:WARN No appenders could be found for logger (com.myclass).
log4j:WARN Please initialize the log4j system properly.

Also nothing gets written to logger.txt
How can I fix this.