Adding changes as requested for code review

src/Microsoft.SqlTools.ServiceLayer/QueryExecution/Contracts/QueryDisposeRequest.cs

@@ -3,7 +3,6 @@
 // Licensed under the MIT license. See LICENSE file in the project root for full license information.
 //
 
-using System;
 using Microsoft.SqlTools.ServiceLayer.Hosting.Protocol.Contracts;
 
 namespace Microsoft.SqlTools.ServiceLayer.QueryExecution.Contracts

src/Microsoft.SqlTools.ServiceLayer/QueryExecution/Contracts/QueryExecuteCompleteNotification.cs

@@ -1,7 +1,15 @@
-using Microsoft.SqlTools.ServiceLayer.Hosting.Protocol.Contracts;
+//
+// Copyright (c) Microsoft. All rights reserved.
+// Licensed under the MIT license. See LICENSE file in the project root for full license information.
+//
+
+using Microsoft.SqlTools.ServiceLayer.Hosting.Protocol.Contracts;
 
 namespace Microsoft.SqlTools.ServiceLayer.QueryExecution.Contracts
 {
+    /// <summary>
+    /// Parameters to be sent back with a query execution complete event
+    /// </summary>
     public class QueryExecuteCompleteParams
     {
         /// <summary>
@@ -17,7 +25,7 @@ namespace Microsoft.SqlTools.ServiceLayer.QueryExecution.Contracts
         /// <summary>
         /// Whether or not the query was successful. True indicates errors, false indicates success
         /// </summary>
-        public bool Error { get; set; }
+        public bool HasError { get; set; }
 
         /// <summary>
         /// Summaries of the result sets that were returned with the query

src/Microsoft.SqlTools.ServiceLayer/QueryExecution/Contracts/QueryExecuteRequest.cs

@@ -3,7 +3,6 @@
 // Licensed under the MIT license. See LICENSE file in the project root for full license information.
 //
 
-using System;
 using Microsoft.SqlTools.ServiceLayer.Hosting.Protocol.Contracts;
 
 namespace Microsoft.SqlTools.ServiceLayer.QueryExecution.Contracts

src/Microsoft.SqlTools.ServiceLayer/QueryExecution/Contracts/QueryExecuteSubsetRequest.cs

@@ -3,7 +3,6 @@
 // Licensed under the MIT license. See LICENSE file in the project root for full license information.
 //
 
-using System;
 using Microsoft.SqlTools.ServiceLayer.Hosting.Protocol.Contracts;
 
 namespace Microsoft.SqlTools.ServiceLayer.QueryExecution.Contracts
@@ -42,7 +41,14 @@ namespace Microsoft.SqlTools.ServiceLayer.QueryExecution.Contracts
     /// </summary>
     public class QueryExecuteSubsetResult
     {
+        /// <summary>
+        /// Subset request error messages. Optional, can be set to null to indicate no errors
+        /// </summary>
         public string Message { get; set; }
+
+        /// <summary>
+        /// The requested subset of results. Optional, can be set to null to indicate an error
+        /// </summary>
         public ResultSetSubset ResultSubset { get; set; }
     }
 

src/Microsoft.SqlTools.ServiceLayer/QueryExecution/Contracts/ResultSetSubset.cs

@@ -1,13 +1,24 @@
-using System;
-using System.Collections.Generic;
-using System.Linq;
-using System.Threading.Tasks;
+//
+// Copyright (c) Microsoft. All rights reserved.
+// Licensed under the MIT license. See LICENSE file in the project root for full license information.
+//
 
 namespace Microsoft.SqlTools.ServiceLayer.QueryExecution.Contracts
 {
+    /// <summary>
+    /// Class used to represent a subset of results from a query for transmission across JSON RPC
+    /// </summary>
     public class ResultSetSubset
     {
+        /// <summary>
+        /// The number of rows returned from result set, useful for determining if less rows were
+        /// returned than requested.
+        /// </summary>
         public int RowCount { get; set; }
+
+        /// <summary>
+        /// 2D array of the cell values requested from result set
+        /// </summary>
         public object[][] Rows { get; set; }
     }
 }

src/Microsoft.SqlTools.ServiceLayer/QueryExecution/Contracts/ResultSetSummary.cs

@@ -1,7 +1,15 @@
-using System.Data.Common;
+//
+// Copyright (c) Microsoft. All rights reserved.
+// Licensed under the MIT license. See LICENSE file in the project root for full license information.
+//
+
+using System.Data.Common;
 
 namespace Microsoft.SqlTools.ServiceLayer.QueryExecution.Contracts
 {
+    /// <summary>
+    /// Represents a summary of information about a result without returning any cells of the results
+    /// </summary>
     public class ResultSetSummary
     {
         /// <summary>