[2005] Error Trapping Help Please

[Jonny1409]

Hello,

I am stumbling my way through VB.Net, but one area I struggle with is Error Trapping.

Basically I am getting the following error when I try to insert an entry into my table on the DB.

System.Web.Services.Protocols.SoapException: 
Server was unable to process request. --->
System.Data.SqlClient.SqlException: Violation of PRIMARY KEY constraint
'PK_tbl_Holidays'. Cannot insert duplicate key in object 'tbl_Holidays'.
The statement has been terminated.
blah
blah
blah.....

Now I know why I am getting this error obviously, but I'd like to display a friendly message to the user to advise them, rather than them getting a large soap error message like this.

How can I do this ?
And are there any resources you'd recommend to deal with error trapping ?