Value Cannot be null. Parameter name:inputString

[Former Member]

I'm using CR13 with Visual Studio 2010(asp.net 3.5)

     I have problem at the time of export report in any format

     report is generated correctly but when I export it shows me error

     " Value Cannot be null. Parameter name:inputString"

     Please Help....

Thanks

Pankaj

[Former Member · Accepted solution]

Hi

     issue is resolved

     give write Access to 'temp' folder for IIS_IUSR'

thanks,

pankaj

[former_member183750]

I am assuming that this is a web app(?). That being the case, what is happening is that on export, the report engine is doing a postback that would require you to somehow input the param values again. Better solution will be to put the report in session, thus eliminating postbacks.

- Ludek

Senior Support Engineer AGS Product Support, Global Support Center Canada

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[Former Member]

Hi,

      thanks for reply...

  yes, its web app.

  Using export feature of Report Viewer to export reports

please refer images below

click on Export (yellow circle 2) generates following error

     I used session as report data source

              System.Data.DataSet objData = result.ResultSet.Copy();

                Session["rptData"] = objData;

    CrystalReports.CompanySnapshot objCompanySnapshot = new CrystalReports.CompanySnapshot();

            objCompanySnapshot.SetDataSource(Session["rptData"]);

     Also, I have used QueryString variables to filter report data, and query string is not change after click on 'Export' button ( Export button of dialog box)

     it works fine on other server (dev,uat)

     issue is only on Live server

    Application environment

          - ASP.net 3.5

          - Visual Studio 2010

     IIS environment is as follow (for dev, UAT)

          - Windows Server 2008 enterprise

          - OS 32 bit

          - CR basic runtime for visual studio 2008 (x64)

          - SAP CR runtime engine for .net framework 4 (32 bit)        

     IIS environment is as follow (for live)

          - Windows Server 2008 R2 enterprise

          - OS 64 bit

          - CR basic runtime for visual studio 2008 (x64)

          - SAP CR runtime engine for .net framework 4 (32 bit)             

I was trying these changes :

     1. install CR basic runtime for visual studio 2010 (x64)

     2. SAP CR runtime engine for .net framework 4 (64 bit)

Please help

Thanks,

Pankaj