How to Create Check box in Contract Class for ssrs report

First create contract class

class SRSRDPCustTableContractClass 

{ 
Noyesid  check; 
} 
__

create below method in contract class

[DataMemberAttribute("Noyesid")] 
public AccountNum parmAccountNum(Noyesid _Noyesid = check) 
{ check= _Noyesid; 
return check; 
} 

In DP class

Class Declaration

[

SRSReportParameterAttribute(classStr(sampleclassContract)

]

public class sampleclassDP extends  SRSReportDataProviderBase

{

    tmptable  _tmptable ;

}

then in your process report

[SysEntryPointAttribute (true)]

public void processReport()

{

        sampleclasscontract         contract;

        noyesid                                 check;

        ;

        contract            = this.parmDataContract();

        check               = contract.parmAccountNum();

       //your logic below

}