diff --git a/dotnet/IEC61850forCSharp/IEC61850CommonAPI.cs b/dotnet/IEC61850forCSharp/IEC61850CommonAPI.cs
index 47205465..daed6660 100644
--- a/dotnet/IEC61850forCSharp/IEC61850CommonAPI.cs
+++ b/dotnet/IEC61850forCSharp/IEC61850CommonAPI.cs
@@ -169,9 +169,26 @@ namespace IEC61850
 		/// </summary>
 		public class Quality
 		{
-
 			private UInt16 value;
 
+			private const UInt16 QUALITY_DETAIL_OVERFLOW = 4;
+			private const UInt16 QUALITY_DETAIL_OUT_OF_RANGE = 8;
+			private const UInt16 QUALITY_DETAIL_BAD_REFERENCE = 16;
+			private const UInt16 QUALITY_DETAIL_OSCILLATORY = 32;
+			private const UInt16 QUALITY_DETAIL_FAILURE = 64;
+			private const UInt16 QUALITY_DETAIL_OLD_DATA = 128;
+			private const UInt16 QUALITY_DETAIL_INCONSISTENT = 256;
+			private const UInt16 QUALITY_DETAIL_INACCURATE = 512;
+			private const UInt16 QUALITY_SOURCE_SUBSTITUTED = 1024;
+			private const UInt16 QUALITY_TEST = 2048;
+			private const UInt16 QUALITY_OPERATOR_BLOCKED = 4096;
+
+			public override string ToString ()
+			{
+				return GetValidity ().ToString ();
+
+			}
+
 			public Quality (int bitStringValue)
 			{
 				value = (UInt16)bitStringValue;
@@ -195,6 +212,133 @@ namespace IEC61850
 
 				value += (ushort)validity;
 			}
+
+			public Validity Validity
+			{
+				get {return GetValidity ();}
+				set { SetValidity (value); }
+			}
+
+			public bool Overflow
+			{
+				get { return ((this.value & QUALITY_DETAIL_OVERFLOW) != 0);}
+				set {
+					if (value)
+						this.value |= QUALITY_DETAIL_OVERFLOW;
+					else
+						this.value = (ushort) ((int) this.value & (~QUALITY_DETAIL_OVERFLOW));
+				}
+			}
+
+			public bool OutOfRange
+			{
+				get { return ((this.value & QUALITY_DETAIL_OUT_OF_RANGE) != 0);}
+				set {
+					if (value)
+						this.value |= QUALITY_DETAIL_OUT_OF_RANGE;
+					else
+						this.value = (ushort) ((int) this.value & (~QUALITY_DETAIL_OUT_OF_RANGE));
+				}
+			}
+
+			public bool BadReference
+			{
+				get { return ((this.value & QUALITY_DETAIL_BAD_REFERENCE) != 0);}
+				set {
+					if (value)
+						this.value |= QUALITY_DETAIL_BAD_REFERENCE;
+					else
+						this.value = (ushort) ((int) this.value & (~QUALITY_DETAIL_BAD_REFERENCE));
+				}
+			}
+
+			public bool Oscillatory
+			{
+				get { return ((this.value & QUALITY_DETAIL_OSCILLATORY) != 0);}
+				set {
+					if (value)
+						this.value |= QUALITY_DETAIL_OSCILLATORY;
+					else
+						this.value = (ushort) ((int) this.value & (~QUALITY_DETAIL_OSCILLATORY));
+				}
+			}
+
+			public bool Failure
+			{
+				get { return ((this.value & QUALITY_DETAIL_FAILURE) != 0);}
+				set {
+					if (value)
+						this.value |= QUALITY_DETAIL_FAILURE;
+					else
+						this.value = (ushort) ((int) this.value & (~QUALITY_DETAIL_FAILURE));
+				}
+			}
+
+			public bool OldData
+			{
+				get { return ((this.value & QUALITY_DETAIL_OLD_DATA) != 0);}
+				set {
+					if (value)
+						this.value |= QUALITY_DETAIL_OLD_DATA;
+					else
+						this.value = (ushort) ((int) this.value & (~QUALITY_DETAIL_OLD_DATA));
+				}
+			}
+
+			public bool Inconsistent
+			{
+				get { return ((this.value & QUALITY_DETAIL_INCONSISTENT) != 0);}
+				set {
+					if (value)
+						this.value |= QUALITY_DETAIL_INCONSISTENT;
+					else
+						this.value = (ushort) ((int) this.value & (~QUALITY_DETAIL_INCONSISTENT));
+				}
+			}
+
+			public bool Inaccurate
+			{
+				get { return ((this.value & QUALITY_DETAIL_INACCURATE) != 0);}
+				set {
+					if (value)
+						this.value |= QUALITY_DETAIL_INACCURATE;
+					else
+						this.value = (ushort) ((int) this.value & (~QUALITY_DETAIL_INACCURATE));
+				}
+			}
+
+			public bool Substituted
+			{
+				get { return ((this.value & QUALITY_SOURCE_SUBSTITUTED) != 0);}
+				set {
+					if (value)
+						this.value |= QUALITY_SOURCE_SUBSTITUTED;
+					else
+						this.value = (ushort) ((int) this.value & (~QUALITY_SOURCE_SUBSTITUTED));
+				}
+			}
+
+			public bool Test
+			{
+				get { return ((this.value & QUALITY_TEST) != 0);}
+				set {
+					if (value)
+						this.value |= QUALITY_TEST;
+					else
+						this.value = (ushort) ((int) this.value & (~QUALITY_TEST));
+				}
+			}
+
+			public bool OperatorBlocked
+			{
+				get { return ((this.value & QUALITY_OPERATOR_BLOCKED) != 0);}
+				set {
+					if (value)
+						this.value |= QUALITY_OPERATOR_BLOCKED;
+					else
+						this.value = (ushort) ((int) this.value & (~QUALITY_OPERATOR_BLOCKED));
+				}
+			}
 		}
 
 		/// <summary>
diff --git a/dotnet/tests/Test.cs b/dotnet/tests/Test.cs
index 8ec403eb..ce22168f 100644
--- a/dotnet/tests/Test.cs
+++ b/dotnet/tests/Test.cs
@@ -454,6 +454,33 @@ namespace tests
 
 			iedServer.Stop ();
 		}
+
+		[Test()]
+		public void Quality()
+		{
+			Quality q = new Quality ();
+
+			Assert.AreEqual (false, q.Overflow);
+
+			q.Overflow = true;
+
+			Assert.AreEqual (true, q.Overflow);
+
+			q.Overflow = false;
+
+			Assert.AreEqual (false, q.Overflow);
+
+			Assert.AreEqual (Validity.GOOD, q.Validity);
+
+			q.Substituted = true;
+
+			Assert.AreEqual (true, q.Substituted);
+			Assert.AreEqual (false, q.Overflow);
+
+			q.Validity = Validity.QUESTIONABLE;
+
+			Assert.AreEqual (Validity.QUESTIONABLE, q.Validity);
+		}
 	}
 }