Button Name="btnOK"
                 Grid.Column="2"
                 HorizontalAlignment="Left"
                 VerticalAlignment="Center"
                 Command="{Binding Path=OKCommand}"
                 Content="{DynamicResource Common_Button_OK}"
                 IsDefault="True"
                 Style="{DynamicResource ButtonStyle}">
           Button.IsEnabled>
             MultiBinding Converter="{StaticResource InvalidMultiValidationRuleToBooleanMultiConverter}"
               ConverterParameter="objectnull|greaterthanzerointeger|greaterthanzerointeger|greaterthanzerointeger">
               Binding ElementName="comboBoxFilter"
                        Mode="OneWay"
                        Path="SelectedItem" />
               Binding ElementName="textBoxFrameRate"
                        Mode="OneWay"
                        Path="Text" />
               Binding ElementName="textBoxSizeWidth"
                        Mode="OneWay"
                        Path="Text" />
               Binding ElementName="textBoxSizeHeight"
                        Mode="OneWay"
                        Path="Text" />
             /MultiBinding>
           /Button.IsEnabled>
         /Button>

public class InvalidMultiValidationRuleToBooleanMultiConverter : IMultiValueConverter
  {
    #region IMultiValueConverter Members

    public object Convert(object[] values, Type targetType, object parameter, CultureInfo culture)
    {
      string[] paramlist = ((string)parameter).Split('|');
      if (paramlist == null || paramlist.Length = 0)
      {
        throw new ArgumentNullException("parameter");
      }
      int length = paramlist.Length;

      IListbool> boollist = new Listbool>();

      for (int i = 0; i paramlist.Length; i++)
      {
        switch (paramlist[i].ToLowerInvariant())
        {
          case "checknameexisted":
            boollist.Add(ValidationRuleHelper.ValidateInvalidCheckNameExistedValidationRule>(values[i]));
            break;
          case "directoryandfileexist":
            boollist.Add(ValidationRuleHelper.ValidateInvalidDirectoryAndFileExistValidationRule>(values[i]));
            break;
          case "greaterthanzerointeger":
            boollist.Add(ValidationRuleHelper.ValidateInvalidGreaterThanZeroIntegerValidationRule>(values[i]));
            break;
          case "numericnull":
            boollist.Add(ValidationRuleHelper.ValidateInvalidNumericNullValidationRule>(values[i]));
            break;
          case "stringlength":
            boollist.Add(ValidationRuleHelper.ValidateInvalidStringLengthValidationRule>(values[i]));
            break;
          case "stringnullorempty":
            boollist.Add(ValidationRuleHelper.ValidateInvalidStringNullOrEmptyValidationRule>(values[i]));
            break;
          case "ipaddress":
            boollist.Add(ValidationRuleHelper.ValidateInvalidIPAddressValidationRule>(values[i]));
            break;
          case "objectnull":
          default:
            boollist.Add(ValidationRuleHelper.ValidateInvalidObjectNullValidationRule>(values[i]));
            break;
        }
      }

      bool result = boollist[0];
      for (int i = 1; i boollist.Count; i++)
      {
        result = result boollist[i];
      }

      return result;
    }

    public object[] ConvertBack(object value, Type[] targetTypes, object parameter, CultureInfo culture)
    {
      return null;
    }

    #endregion
  }