Validation.RequireField("text1");
Validation.RequireField("text1", "The text1 field is required");
Validation.RequireFields("text1", "text2", "text3");

Validation.Add("text1", Validation.StringLength(5));
Validation.Add("textDate", Validation.DateTime("Enter a date"));
Validation.Add("textCount", Validation.Integer("Enter a number"));
Validation.Add("textCount",
Validation.Range(1, 10, "Enter a value between 1 and 10"));