* style.css:

* UserPost.aspx:
* Estimate.cs:
* Writting.cs:
* WorkFlowController.cs:
* NpgsqlContentProvider.cs: 
* FrontOfficeApiController.cs: Fixed the GetEstimate function,
  refactoring

yavscModel/WorkFlow/Estimate.cs

@@ -13,6 +13,8 @@ namespace yavscModel.WorkFlow
 		public decimal Ciffer {
 			get {
 				decimal total = 0;
+				if (Lines == null)
+					return total;
 				foreach (Writting l in Lines)
 					total += l.UnitaryCost * l.Count;
 				return total;

yavscModel/WorkFlow/Writting.cs

@@ -6,7 +6,7 @@ namespace yavscModel.WorkFlow
 	{
 		public decimal UnitaryCost { get; set; }
 		public int Count { get; set; }
-		public string ProductReference { get; set; }
+		public long ProductReference { get; set; }
 		public string Description { get; set; } 
 	}
 }