public static (bool, {returnTypeFullName}) Add{entityTypeName}(
this {contextFullName} dbContext, {createTypeFullName} {toCreateVarName}) {
      var {newEntityVarName} = new {entityTypeFullName}({toCreateVarName});
      dbContext.{propertyName}.Add({newEntityVarName});  
      var success = dbContext.SaveChanges() >= 0;
      return (success, new {returnTypeFullName}({newEntityVarName}));
}