How will you find out that wethere the problem hooked with UDF or not?

Put a write statement in the UDF.

how will you find out that wether the problem hooked with UDF or not help me plz thanks

Once you have succesfully compiled and loaded, if you select the udf name in the drop down list at the desired location it is hooked. Now the question is how to understand if its executed or not. The same is said by Allan i.e. put a write statement. i.e. you can put a print command in your udf and as you proceed with solving you will the the message printed in console window. You can add the following commandin your udf. Message("I am in udf");