Cannot Access Campaign Field from Lead Object Record in Salesforce

Hi pranav,

This field is not accessible if you query a Lead object using API. User can get the details by querying CampaignMember object through API.
List<CampaignMember> cms=[SELECT CampaignID, LeadID, Status FROM CampaignMember WHERE CampaignID =: CampaignID__c];
Set<ID> LeadIDs= new Set<ID>();
FOR(CampaignMember cm:cms){
if(LeadIDs.contains(cm.LeadID)==FALSE){
LeadIDs.add(cm.LeadID);
}
}

Thanks.