SSRS report

 To make values empty while opening contract and making last given values empty

code:-

In controller class :-

 protected void prePromptModifyContract()

 {

     super();

     MyContract contract = this.parmReportContract().parmRdpContract() as MyContract;

     if (contract)

     {

         contract.parmFromDate(dateNull());

         contract.parmToDate(dateNull());

         contract.parmPRNumber(null);

     }

 }