Conditional parameters

I have two parameters, one list box generated from a union dataset, that has
an option to generate the report for all suppliers. When this option is
selected the second parameter (a search parameter, based on user input) must
not allow the input of %, can anyone let me know how this can be achieved.
Also can a error message be displayed when the user inputs a %?
Any help greatly anticipated.
Dave.I assume that you are generating reports directly from the
report manager.
I dont know if there is a direct way of acchieving this
but would like to suggest a work around.
Have an additional text box and type in some error text in
it eg : "Please do not enter %" or "Wrong parameters"
Then set the hidden property of this text box to an
expression that validates the parameter value and hides
the textbox if the values entered are correct otherwise
the textbox is visible.
Then for other controls on the report set the same
condition for visibility but in this case make the
controls visible if the parameters entered are correct
otherwise the controls will be hidden.
So if the user enters a wrong value for the second
parameter then only one textbox will appear asking the
user to enter the values again.
Hope this helps!
>--Original Message--
>I have two parameters, one list box generated from a
union dataset, that has
>an option to generate the report for all suppliers. When
this option is
>selected the second parameter (a search parameter, based
on user input) must
>not allow the input of %, can anyone let me know how this
can be achieved.
>Also can a error message be displayed when the user
inputs a %?
>Any help greatly anticipated.
>Dave.
>.
>