Forcing "No Values" for "Optional Prompt" parameter

Hello,
I develop the .NET web application with Crystal Reports 2008.
I have the Crystal Report with one parameter.
This parameter is "Optional Prompt" (ParameterFieldDefinition.IsOptionalPrompt = true).
At first the webpage (with CrystalReportViewer control) shows the prompt field to enter parameter values, and "OK" button.
If user doesn't enter any values and clicks button, data for default value appears.
So the question: How can I force a showing the data for default parameter value, without prompt field appearance?
In this case: user opens the webpage, and data for default value appears.

Hi Ludek.
1. Is SP3 required to get the answer?
If so, I'll install it.
2. The default value is the empty value.
let me describe problem in details:
The Crystal Report shows Customers data from MS SQL database.
This Crystal Report has 1 parameter: CustomerID (string).
If user enters value for this parameter, the report shows data only for Customer with entered CustomerID.
But if user doesn't enter any value, all the data appears (for all Customers).
So, the page with prompt field appears when user opens the web page with this report.
If user enters some CustomerID and clicks "OK" button, the web page reloads and data for this Customer appears.
If user doesn't enter any value and clicks "OK" button, the web page reloads and shows data for all Customers.
This is the CORRECT behavior!
But in some cases I need to omit the page with prompt field.
I need to see data for all customers immediately.
Is it possible?
I tried to set "" (empty string) value for this parameter, but prompt field still appears.
3. .NET version is 4.0
4. Both - it happens on my development machine, and on other machine after deploy.

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