private void UpdateOnGenerateExpression(DocumentTemplatePackage Package, string OnGenerateExpression) { string expression; if (string.IsNullOrWhiteSpace(OnGenerateExpression)) expression = null; else expression = OnGenerateExpression.Trim(); if (Package.OnGenerateExpression != expression) { Package.OnGenerateExpression = expression; DocumentTemplatePackages.UpdatePackage(Package); Package.OnGenerateExpressionInvalidateCache(); } }