In my VB.NET code, I am trying to rename the CrystalReportViewer1.Id so that when a user exports a file, it will be named with the name of the report plus a parameter that they ran the report on. When testing my results, I get "Value cannot be null. Parameter name: inputString" on my web page. My question is where should I be inserting the CrystalReportViewer1.Id code so that it can work and without the error message?
Thank you in advance,