MaxTextLength

Try this:

      AttributeCollection atts = EntityPropertyDescriptors.Employee.FirstName.Attributes;

      foreach (Attribute anAttribute in atts) {

        if (anAttribute is MaxTextLengthAttribute) {

          MaxTextLengthAttribute maxAttr = anAttribute as MaxTextLengthAttribute;

          MessageBox.Show(maxAttr.MaxLength.ToString());

        }

      }