--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/Source/Validation/RequiredAttribute.cs	Thu Mar 27 21:46:09 2014 +0400
@@ -0,0 +1,28 @@
+using System;
+
+namespace BLToolkit.Validation
+{
+	[AttributeUsage(AttributeTargets.Property | AttributeTargets.Field)]
+	public class RequiredAttribute : ValidatorBaseAttribute
+	{
+		public RequiredAttribute()
+		{
+		}
+
+		public RequiredAttribute(string errorMessage)
+			: base(errorMessage)
+		{
+		}
+
+		public override bool IsValid(ValidationContext context)
+		{
+			return context.IsNull(context) == false;
+		}
+
+		public override string ErrorMessage
+		{
+			get { return base.ErrorMessage ?? "'{0}' is required."; }
+			set { base.ErrorMessage = value; }
+		}
+	}
+}