diff --git a/source/dotnet/Library/AdaptiveCards/AdaptiveActionSet.cs b/source/dotnet/Library/AdaptiveCards/AdaptiveActionSet.cs
index c848cbb3b5..b53b2dda9a 100644
--- a/source/dotnet/Library/AdaptiveCards/AdaptiveActionSet.cs
+++ b/source/dotnet/Library/AdaptiveCards/AdaptiveActionSet.cs
@@ -32,6 +32,15 @@ public class AdaptiveActionSet : AdaptiveElement
         [JsonProperty(Required = Required.Default)]
         public override string Type { get; set; } = TypeName;
 
+		/// 
+        /// Horizontal alignment () to use.
+        /// 
+        [JsonProperty(NullValueHandling = NullValueHandling.Ignore)]
+#if !NETSTANDARD1_3
+        [XmlAttribute]
+#endif
+        public AdaptiveHorizontalAlignment HorizontalAlignment { get; set; }
+
         /// 
         /// The actions contained within this ActionSet.
         /// 
@@ -40,6 +49,7 @@ public class AdaptiveActionSet : AdaptiveElement
         [XmlElement(typeof(AdaptiveOpenUrlAction))]
         [XmlElement(typeof(AdaptiveShowCardAction))]
         [XmlElement(typeof(AdaptiveSubmitAction))]
+		[XmlElement(typeof(AdaptiveHttpAction))]
         [XmlElement(typeof(AdaptiveToggleVisibilityAction))]
         [XmlElement(typeof(AdaptiveExecuteAction))]
         [XmlElement(typeof(AdaptiveUnknownAction))]
diff --git a/source/dotnet/Library/AdaptiveCards/AdaptiveCard.cs b/source/dotnet/Library/AdaptiveCards/AdaptiveCard.cs
index c645bfd134..90d5a698ec 100644
--- a/source/dotnet/Library/AdaptiveCards/AdaptiveCard.cs
+++ b/source/dotnet/Library/AdaptiveCards/AdaptiveCard.cs
@@ -190,6 +190,7 @@ public AdaptiveCard() : this(new AdaptiveSchemaVersion(1, 0)) { }
         [XmlElement(typeof(AdaptiveToggleVisibilityAction))]
         [XmlElement(typeof(AdaptiveExecuteAction))]
         [XmlElement(typeof(AdaptiveUnknownAction))]
+		[XmlElement(typeof(AdaptiveHttpAction))]
 #endif
         public List Actions { get; set; } = new List();
 
@@ -257,6 +258,36 @@ public bool ShouldSerializeJsonSchema()
         [DefaultValue(null)]
         public AdaptiveAuthentication Authentication { get; set; }
 
+		/// 
+        /// Defines originator id for card.
+        /// 
+        [JsonProperty(NullValueHandling = NullValueHandling.Ignore)]
+#if !NETSTANDARD1_3
+        [XmlElement]
+#endif
+        [DefaultValue(null)]
+        public string Originator { get; set; }
+
+		/// 
+        /// Sets the text flow direction
+        /// 
+        [JsonProperty(NullValueHandling = NullValueHandling.Ignore)]
+#if !NETSTANDARD1_3
+        [XmlElement]
+#endif
+        [DefaultValue(null)]
+        public bool? Rtl { get; set; } = null;
+
+		/// 
+        /// Tells the client whether or not it should constrain the width of the card.
+        /// 
+        [JsonProperty(NullValueHandling = NullValueHandling.Ignore)]
+#if !NETSTANDARD1_3
+        [XmlElement]
+#endif
+        [DefaultValue(null)]
+        public bool? ConstrainWidth { get; set; } = null;
+
         /// 
         /// Determines whether the height property of an AdaptiveCard should be serialized.
         /// 
diff --git a/source/dotnet/Library/AdaptiveCards/AdaptiveColumnSet.cs b/source/dotnet/Library/AdaptiveCards/AdaptiveColumnSet.cs
index 5ecaeab692..6dfea433ec 100644
--- a/source/dotnet/Library/AdaptiveCards/AdaptiveColumnSet.cs
+++ b/source/dotnet/Library/AdaptiveCards/AdaptiveColumnSet.cs
@@ -24,6 +24,15 @@ public class AdaptiveColumnSet : AdaptiveCollectionElement
 #endif
         public override string Type { get; set; } = TypeName;
 
+		/// 
+        /// Horizontal alignment () to use.
+        /// 
+        [JsonProperty(NullValueHandling = NullValueHandling.Ignore)]
+#if !NETSTANDARD1_3
+        [XmlAttribute]
+#endif
+        public AdaptiveHorizontalAlignment HorizontalAlignment { get; set; }
+
         /// 
         /// Collection of Columns that this ColumnSet contains.
         /// 
@@ -33,6 +42,15 @@ public class AdaptiveColumnSet : AdaptiveCollectionElement
 #endif
         public List Columns { get; set; } = new List();
 
+		/// 
+        /// Gets or sets the padding.
+        /// 
+        [JsonProperty(NullValueHandling = NullValueHandling.Ignore)]
+#if !NETSTANDARD1_3
+        [XmlElement]
+#endif
+        public AdaptivePadding Padding { get; set; }
+
         public override IEnumerator GetEnumerator()
         {
             return Columns.GetEnumerator();
diff --git a/source/dotnet/Library/AdaptiveCards/AdaptiveContainer.cs b/source/dotnet/Library/AdaptiveCards/AdaptiveContainer.cs
index 1e104e5ec9..949e0b0a57 100644
--- a/source/dotnet/Library/AdaptiveCards/AdaptiveContainer.cs
+++ b/source/dotnet/Library/AdaptiveCards/AdaptiveContainer.cs
@@ -68,6 +68,15 @@ public class AdaptiveContainer : AdaptiveCollectionElement
         [DefaultValue(null)]
         public bool? Rtl { get; set; } = null;
 
+		/// 
+        /// Gets or sets the padding.
+        /// 
+        [JsonProperty(NullValueHandling = NullValueHandling.Ignore)]
+#if !NETSTANDARD1_3
+        [XmlElement]
+#endif
+        public AdaptivePadding Padding { get; set; }
+
         public override IEnumerator GetEnumerator()
         {
             return Items.GetEnumerator();
diff --git a/source/dotnet/Library/AdaptiveCards/AdaptiveHttpAction.cs b/source/dotnet/Library/AdaptiveCards/AdaptiveHttpAction.cs
new file mode 100644
index 0000000000..4cda458f19
--- /dev/null
+++ b/source/dotnet/Library/AdaptiveCards/AdaptiveHttpAction.cs
@@ -0,0 +1,71 @@
+// Copyright (c) Microsoft Corporation. All rights reserved.
+// Licensed under the MIT License.
+using Newtonsoft.Json;
+using System.Collections.Generic;
+using System.Xml.Serialization;
+
+namespace AdaptiveCards
+{
+    /// 
+    /// Represents the Action.Http element.
+    /// 
+#if !NETSTANDARD1_3
+    [XmlType(TypeName = AdaptiveHttpAction.TypeName)]
+#endif
+    public class AdaptiveHttpAction : AdaptiveAction
+    {
+        /// 
+        public const string TypeName = "Action.Http";
+
+        /// 
+#if !NETSTANDARD1_3
+        [XmlIgnore]
+#endif
+        public override string Type { get; set; } = TypeName;
+
+        /// 
+        /// Http method.
+        /// 
+        [JsonProperty(NullValueHandling = NullValueHandling.Ignore)]
+#if !NETSTANDARD1_3
+        [XmlAttribute]
+#endif
+        public string Method { get; set; }
+
+		/// 
+        /// Target url for request.
+        /// 
+        [JsonProperty(NullValueHandling = NullValueHandling.Ignore)]
+#if !NETSTANDARD1_3
+        [XmlAttribute]
+#endif
+        public string Url { get; set; }
+
+		/// 
+        /// Body of request.
+        /// 
+        [JsonProperty(NullValueHandling = NullValueHandling.Ignore)]
+#if !NETSTANDARD1_3
+        [XmlAttribute]
+#endif
+        public string Body { get; set; }
+
+		/// 
+        /// List of headers.
+        /// 
+        [JsonProperty(NullValueHandling = NullValueHandling.Ignore)]
+#if !NETSTANDARD1_3
+        [XmlAttribute]
+#endif
+        public List Headers { get; set; }
+		
+		/// 
+		/// Adds a  to the AdaptiveHttpAction.
+		/// 
+		public  void AddHttpHeader(AdaptiveHttpHeader header)
+        {
+            this.Headers ??= new List();
+			this.Headers.Add(httpHeader);
+        }
+    }
+}
diff --git a/source/dotnet/Library/AdaptiveCards/AdaptiveHttpHeader.cs b/source/dotnet/Library/AdaptiveCards/AdaptiveHttpHeader.cs
new file mode 100644
index 0000000000..812a0be015
--- /dev/null
+++ b/source/dotnet/Library/AdaptiveCards/AdaptiveHttpHeader.cs
@@ -0,0 +1,42 @@
+// Copyright (c) Microsoft Corporation. All rights reserved.
+// Licensed under the MIT License.
+using Newtonsoft.Json;
+using System;
+using System.ComponentModel;
+using System.Xml.Serialization;
+
+namespace AdaptiveCards
+{
+    /// 
+    /// Represents the AdaptiveHttpHeader.
+    /// 
+    public class AdaptiveHttpHeader
+    {
+		/// 
+        /// Initializes .
+        /// 
+        public AdaptiveHttpHeader(string name, string value)
+        {
+			Name = name;
+			Value = value;
+        }
+
+        /// 
+        /// Gets or sets the header name.
+        /// 
+        [JsonProperty(NullValueHandling = NullValueHandling.Ignore)]
+#if !NETSTANDARD1_3
+        [XmlAttribute]
+#endif
+        public string Name { get; set; }
+
+		/// 
+        /// Gets or sets the header value.
+        /// 
+        [JsonProperty(NullValueHandling = NullValueHandling.Ignore)]
+#if !NETSTANDARD1_3
+        [XmlAttribute]
+#endif
+        public string Value { get; set; }
+    }
+}
diff --git a/source/dotnet/Library/AdaptiveCards/AdaptivePadding.cs b/source/dotnet/Library/AdaptiveCards/AdaptivePadding.cs
new file mode 100644
index 0000000000..76b19701a2
--- /dev/null
+++ b/source/dotnet/Library/AdaptiveCards/AdaptivePadding.cs
@@ -0,0 +1,70 @@
+// Copyright (c) Microsoft Corporation. All rights reserved.
+// Licensed under the MIT License.
+using Newtonsoft.Json;
+using System;
+using System.ComponentModel;
+using System.Xml.Serialization;
+
+namespace AdaptiveCards
+{
+    /// 
+    /// Represents padding object.
+    /// 
+    public class AdaptivePadding
+    {
+		/// 
+        /// Initializes .
+        /// 
+        public AdaptivePadding(AdaptiveSpacing left, AdaptiveSpacing top, AdaptiveSpacing right, AdaptiveSpacing bottom)
+        {
+			Left = left;
+			Right = right;
+			Top = top;
+			Bottom = bottom;
+        }
+
+		/// 
+        /// Initializes .
+        /// 
+        public AdaptivePadding(AdaptiveSpacing padding)
+        {
+			Left = Right = Top = Bottom = padding;
+        }
+
+        /// 
+        /// Gets or sets the left padding.
+        /// 
+        [JsonProperty(NullValueHandling = NullValueHandling.Ignore)]
+#if !NETSTANDARD1_3
+        [XmlAttribute]
+#endif
+        public AdaptiveSpacing Left { get; set; }
+
+		/// 
+        /// Gets or sets the right padding.
+        /// 
+        [JsonProperty(NullValueHandling = NullValueHandling.Ignore)]
+#if !NETSTANDARD1_3
+        [XmlAttribute]
+#endif
+        public AdaptiveSpacing Right { get; set; }
+
+		/// 
+        /// Gets or sets the top padding.
+        /// 
+        [JsonProperty(NullValueHandling = NullValueHandling.Ignore)]
+#if !NETSTANDARD1_3
+        [XmlAttribute]
+#endif
+        public AdaptiveSpacing Top { get; set; }
+
+		/// 
+        /// Gets or sets the bottom padding.
+        /// 
+        [JsonProperty(NullValueHandling = NullValueHandling.Ignore)]
+#if !NETSTANDARD1_3
+        [XmlAttribute]
+#endif
+        public AdaptiveSpacing Bottom { get; set; }
+    }
+}
diff --git a/source/dotnet/Library/AdaptiveCards/AdaptiveTextInput.cs b/source/dotnet/Library/AdaptiveCards/AdaptiveTextInput.cs
index 20a30528b9..725bb76b3c 100644
--- a/source/dotnet/Library/AdaptiveCards/AdaptiveTextInput.cs
+++ b/source/dotnet/Library/AdaptiveCards/AdaptiveTextInput.cs
@@ -81,6 +81,7 @@ public class AdaptiveTextInput : AdaptiveInput
         [XmlElement(typeof(AdaptiveOpenUrlAction))]
         [XmlElement(typeof(AdaptiveShowCardAction))]
         [XmlElement(typeof(AdaptiveSubmitAction))]
+		[XmlElement(typeof(AdaptiveHttpAction))]
         [XmlElement(typeof(AdaptiveToggleVisibilityAction))]
         [XmlElement(typeof(AdaptiveUnknownAction))]
 #endif
diff --git a/source/dotnet/Library/AdaptiveCards/AdaptiveTypedElementConverter.cs b/source/dotnet/Library/AdaptiveCards/AdaptiveTypedElementConverter.cs
index 7f983d4cca..a19860b22e 100644
--- a/source/dotnet/Library/AdaptiveCards/AdaptiveTypedElementConverter.cs
+++ b/source/dotnet/Library/AdaptiveCards/AdaptiveTypedElementConverter.cs
@@ -49,6 +49,7 @@ public class AdaptiveTypedElementConverter : AdaptiveTypedBaseElementConverter,
                 [AdaptiveTableRow.TypeName] = typeof(AdaptiveTableRow),
                 [AdaptiveTableCell.TypeName] = typeof(AdaptiveTableCell),
                 [AdaptiveSubmitAction.TypeName] = typeof(AdaptiveSubmitAction),
+				[AdaptiveHttpAction.TypeName] = typeof(AdaptiveHttpAction),
                 [AdaptiveExecuteAction.TypeName] = typeof(AdaptiveExecuteAction),
                 [AdaptiveOpenUrlAction.TypeName] = typeof(AdaptiveOpenUrlAction),
                 [AdaptiveShowCardAction.TypeName] = typeof(AdaptiveShowCardAction),
diff --git a/source/dotnet/Library/AdaptiveCards/Rendering/AdaptiveActionHandlers.cs b/source/dotnet/Library/AdaptiveCards/Rendering/AdaptiveActionHandlers.cs
index 7c2c33461f..f257bd3f56 100644
--- a/source/dotnet/Library/AdaptiveCards/Rendering/AdaptiveActionHandlers.cs
+++ b/source/dotnet/Library/AdaptiveCards/Rendering/AdaptiveActionHandlers.cs
@@ -14,6 +14,7 @@ public class AdaptiveActionHandlers
         {
             typeof(AdaptiveOpenUrlAction),
             typeof(AdaptiveSubmitAction),
+			typeof(AdaptiveHttpAction),
             typeof(AdaptiveShowCardAction),
             typeof(AdaptiveToggleVisibilityAction),
             typeof(AdaptiveExecuteAction)
diff --git a/source/dotnet/Library/AdaptiveCards/Rendering/AdaptiveVisitor.cs b/source/dotnet/Library/AdaptiveCards/Rendering/AdaptiveVisitor.cs
index 4b4208995b..1353a672a5 100644
--- a/source/dotnet/Library/AdaptiveCards/Rendering/AdaptiveVisitor.cs
+++ b/source/dotnet/Library/AdaptiveCards/Rendering/AdaptiveVisitor.cs
@@ -139,6 +139,9 @@ public virtual void Visit(AdaptiveAction action)
                 Visit(urlAction);
 
             if (action is AdaptiveSubmitAction submitAction)
+                Visit(submitAction);
+			
+			if (action is AdaptiveHttpAction httpAction)
                 Visit(submitAction);
 
             if (action is AdaptiveShowCardAction cardAction)
@@ -153,6 +156,10 @@ public virtual void Visit(AdaptiveAction action)
 
         public virtual void Visit(AdaptiveSubmitAction action)
         {
+        }
+
+		public virtual void Visit(AdaptiveHttpAction action)
+        {
         }
 
         public virtual void Visit(AdaptiveOpenUrlAction action)