Report Definition Language

Using VS 2005, I have created a piece of software that creates an RDL file using XML. However, although my data (though a DataView control) is showing as it should, and I can update this to create new data, I cannot get the RDL to display a variable which I change and use as a 'header text' to the report. The variable is shown the first time I display the RDL through a ReportViewer Control but remains static thereafter. The interesting thing is that when I view the XML through a third-party viewer, it shows the correct value stored in the variable.

For information, I am using a child form in a MDI to create the data that is fed into another child form that contains the ReportViewer. The MDI has been programmed so that the child forms are not closed and disposed of, but are hidden from view.

Has anyone any initial ideas of what I could do to flush or clear the RDL or any other relevant object?

Are you viewing the RDL in the report designer when this happens? Report Designer has a functionality to cache the data in preview (http://msdn2.microsoft.com/en-us/library/ms157366.aspx). You should be able to click on the refresh button to get new data.