.java file compiling but not executing in jdk6

Using javac in jdk6 I can compile a .java file but cant executing the same using java command from my own directory. I can still compile and execute the same file from jdk\bin directory. I am using windows XP Home. While executing the .java file from my own directory, it fires a message: "The Java class could not be loaded. java.lang.UnsupportedClassVersionError: Myfilename (Unsupported major.minor Version 50.0)". i have set path in environment variable as "C:\sun\sdk\jdk\bin" where jdk placed in sun\sdk.
Please help me to solve the problem

This isn't information we can give you. You have to set it up based on your system.
Do you understand how execution paths work? There's a list of filesystem paths, separated by a semicolon or a colon depending on the system, all concatenated into one big string. The entries earlier in the string are looked in first.
So if your path has this:
c:\Windows\java;c:\sun\sdk\jdk\bin
Then if you type "java" from the command line, the Windows one would be executed, not the JDK 6 one.

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* To change this template, choose Tools | Templates
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.java file compiling but not executing in jdk6

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