Report Parameters behaving strangely

Question

Hello,
I just completed my report in the designer provided with visual studio 2008, it's a relatively complex report with 6 subreports and has multiple detail sections. The parent report has one parameter which is used in a Database command. The report works nicely when previewing from the designer and only shows up one required parameters as it should. All the subreports have parameters as well but these are all linked to things on the parent report.
The problem is when I try to execute the report from code, it ignores my parameters and proceeds to ask for multiple parameters, both including the parent parameters and all sub report parameters. If I enter these manually just to test if it works, I then get a message saying there's an error in one of the subreport's record selection formula. However I'm not sure how much I believe this as the previewing works completely fine.
I just have no idea what is happening and why I am getting requests for so many parameters?
Marlon

Answer 1

Update ***
I have managed to work through towards getting the report to display in the .NET app now, I needed to check the IsLinked() fucntion before assigning parameters.
However, I have now been presented with an even more weird problem: If I switch database in code, I now get asked to enter a parameter I know is a linked one, if I do I get a message saying the record selection formula references an unknown field. But if I get the designer to change database, then get it to preview, it works flawlessly (both in the previewer and in the application). Until I change the database back to the original one, where I get the same error.
Our application needs to be used in many client organisations with each having different connection strings / databases (all have the same schema obviously) so I need this report to run independent of what the database it was designed / compiled on.
Here is the code I use to switch database within the application, is there anything different to the way I do it to the way the crystal report designer does it? As the designer is obviously doing something behind the scenes.
This code has worked on the 15 or so reports I've designed so far.
               ReportDocument cryRpt = new ReportDocument();
                TableLogOnInfo tLI = new TableLogOnInfo();
                ConnectionInfo cI = new ConnectionInfo();
                Tables tables;
                cryRpt.Load(reportPath);
                    cI.ServerName = (string)builder["Data Source"];
                    cI.DatabaseName = (string)builder["Initial Catalog"];
                    cI.UserID = (string)builder["User ID"];
                    cI.Password = (string)builder["Password"];
                    tables = cryRpt.Database.Tables;
                    foreach (Table t in tables)
                        tLI = t.LogOnInfo;
                        tLI.ConnectionInfo = cI;
                        t.ApplyLogOnInfo(tLI);