// Get all the active records for a custom entity and deacitvate it

// In this case Custom Entity name is new_customentity and it has many to one relationship with contact record

 // So we are finding all the active custom entity records for a particular contact

 

 

private
void DeActivateCustomRecords(string contactID, IOrganizationService _service){
// setting contact id

condition1.AttributeName=“new_contactid”;

condition1.Operator =ConditionOperator.Equal;

condition1.Values.Add(contactID);

// and state code =0 -> active record

ConditionExpression condition2 = new ConditionExpression();

condition2.AttributeName =“statecode”;

condition2.Operator =ConditionOperator.Equal;

condition2.Values.Add(0);

 // And the condition

FilterExpression filterExpression = new FilterExpression();

filterExpression.AddCondition(condition1);

filterExpression.AddCondition(condition2);

filterExpression.FilterOperator =LogicalOperator.And;

 //Create a column set to get the custom entity records id
//we need them to disable the records

ColumnSet columns = new ColumnSet(“new_customentityid”);
// Create query expression.

QueryExpression query1 = new QueryExpression();

query1.ColumnSet = columns;

query1.EntityName =“new_customentity”;

query1.Criteria = filterExpression;

 try{

EntityCollection result= _service.RetrieveMultiple(query1);
foreach (Entity customEntityResult in result.Entities){

SetStateRequest setState = new SetStateRequest();

setState.EntityMoniker = new EntityReference();

setState.EntityMoniker.Id = customEntityResult.Id;

setState.EntityMoniker.Name = “new_customentity”;

setState.EntityMoniker.LogicalName = entityElgResult.LogicalName;

setState.State =new OptionSetValue();

setState.State.Value = 1;

setState.Status = new OptionSetValue();

setState.Status.Value = -1;

SetStateResponse setStateResponse = (SetStateResponse)_service.Execute(setState);

}

}
catch (Exception ex){
throw ex;

}

Hope it is useful !