Disable save button when validation fails

Question

As you can likely see from the title, I am about to ask something which has been asked many times before. But still, after reading all these other questions, I cannot find a

Answer 1

This article http://www.asp.net/mvc/tutorials/older-versions/models-%28data%29/validating-with-the-idataerrorinfo-interface-cs moves the individual validation into the properties:

public partial class Player : IDataErrorInfo
{
    Dictionary _errorInfo;

    public Player()
    {
        _errorInfo = new Dictionary();
    }

    public bool CanSave { get { return _errorInfo.Count == 0; }

    public string this[string columnName]
    {
        get 
        { 
            return _errorInfo.ContainsKey(columnName) ? _errorInfo[columnName] : null;
        }
    }

    public string FirstName
    {
        get { return _firstName;}
        set
        {
            if (String.IsNullOrWhiteSpace(value))
                _errorInfo.AddOrUpdate("FirstName", "Geef een voornaam in");
            else
            {
                _errorInfo.Remove("FirstName");
                _firstName = value;
            }
        }
    }
}

(you would have to handle the Dictionary AddOrUpdate extension method). This is similar to your error count idea.