Get list of unattested billograms

Utility.cs

public class Utility
{
     ............
     
     public string billogramState ="unattested";
 
     public async Task<List<BillogramStructure>> GetBillogramsByState()
    	{
			List<BillogramStructure> billograms = _billogramUtility.GetBillogramsByState(billogramState).Result;
			return billograms;
        }
        
     .............
}