Get sql statement for parameter through reporting service

hi,

i'm creating a winform application that communicates with a reporting service server through the SOAP interface.

If a user selects a report and presses a button a generic screen is created where I create all winforms controls like datetimepicker(if parameter type is DateTime) or combobox (if parameter type is String). When the parameter value is String and there are DefaultValues I add every value to the combobox. But when it has no DefaultValues and thus is generated through SQL I want the SQL statement but I can't find that property. Her you got the code to make it more comprehensive.

[CODE]
else if (rp.Type.ToString() == "String")
{
ComboBox combobox = new ComboBox();
ValidValue[] values = rp.ValidValues;
if (values == null)
{
String sqlString =
}
else
{
foreach (ValidValue value in values)
{
combobox.Items.Add(value.Label.ToString());
}
}
VerControl += 30;
combobox.Location = new Point(HorControl, VerControl);
combobox.Width = 200;
this.Controls.Add(combobox);
}
[/CODE]
hope you can help

greetings
Never mind. When asking for the report parameters I changed the boolean ForRendering to true so I get the values for SQL based parameters too! I don't have the sql statement but i get the values that I need