asp.net MVC RuleViolation.ErrorMessage into Html.ValidationMessage

Question

I want to use the error message returned by a RuleViolation as the validationMessage of the Html.ValidationMessage(modelName, validationMessage). Simple Example: Person.cs ``` public partial class Person { public bool IsValid { get { return (GetRuleViolations().Count() == 0); } } public IEnumerable GetRuleViolations() { if (String.IsNullOrEmpty(Name)) yield return new RuleViolation("Name required", "Name"); yield break; } } ``` adding errors to modelstate ``` foreach (RuleViolation issue in errors) { modelState.AddModelError(issue.PropertyName, issue.ErrorMessage); } ``` asp page /createPerson/ ``` <%=Html.TextBox("Name",Model.Name)%> <%=Html.ValidationMessage("Name", "Name required")%> ``` What I want to do is use the RuleViolation message instead of "Name required" above. Is this possible? solution is (from Alexander Prokofyev ) use ValidationMessage with a single paramter ``` <%=Html.ValidationMessage("Name")%> ``` this is a very simple example, some of my business r…

Accepted Answer

You should use ValidationMessage() helpers with only one parameter like

```
<%= Html.ValidationMessage("Name") %>
```

and call code

```
foreach (var ruleViolation in GetRuleViolations())
    ModelState.AddModelError(ruleViolation.PropertyName, 
        ruleViolation.ErrorMessage);
```

in controller before returning a view (I suppose you have taken RuleViolation class definition from NerdDinner source).

asp.net MVC RuleViolation.ErrorMessage into Html.ValidationMessage

Solution

Problem