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SF Buzz VutukuriSF Buzz Vutukuri 

apex trigger

// the below sample code showing me error
 if(Trigger.isBefore && Trigger.isUpdate )
    {
      for(Lead led:Trigger.new)
        {
           string compnayname='company';
  Lead oldled= Trigger.oldMap.get(led.ID);

    if(oldled.compnayname!=led.compnayname)// ERROR : there is no such field company name :( (But there I am using the variable name instead of using field API directly, to acheive the requirement. Could plese tell me how to acheive this using the variable name)
 {

              leadids.add(ld.id);    
        }
    
    }
KaranrajKaranraj
No you can't use the lable name/variable name in the apex code, if you want to refer a field. You have to use the API name field to access the field programatically or by API. Normally API name of the custom field will use __c. 

If want to know the API name of the field, then go to that Object->Fields, it will disaply the API name of the field which you want to access
SF Buzz VutukuriSF Buzz Vutukuri

@karanraj - thanks for reply, But I need to use field API name dynamically and need to check old values and news values aren't same!!

Is there any way to use it dynamically >>>>>>>>>>>
Bhupendra chauhanBhupendra chauhan
You need use another for loop in side your for.....not best practice but if you need it you can go for it.
Map<String, Schema.SObjectField> fieldsMap = Schema.SObjectType.Lead.fields.getMap();
 for(String key : fieldsMap.keySet()){
    Schema.DescribeFieldResult result = fieldsMap.get(key).getDescribe();
    if(!result.isNillable() && result.isCreateable()) {
        System.debug(logginglevel.info, '+++++++++ result = '+result.getName());

    }                   
}