I have setup my Global.asax file, as shown below, to send me details of any unexpected errors and I have been getting repeated emails containing the following value for myException.message. 
A potentially dangerous Request.Form value was detected from the client (MyMaster$phMain$txtPrintsExclPostageUK1="...ijcjujpo,
The page in question allows no user input. It mainly contains text and a set of read-only text boxes that are populated from my SQL Server database, including the one named 'txtPrintsExclPostageUK1'. My first question is why such an error is triggered for a read-only text box, as surely that cannot be the source of any dangerous code insertion? On the other hand, I've no idea where '...ijcjujpo' has come from.
I would also like to know why the exception message appears to have been truncated.
David
Sub Applica ...

Go to the complete details ...