Forgot to add two new files before previous commit.

Driver/Core/EvalFlags.cs

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+/* Copyright 2010-2011 10gen Inc.
+*
+* Licensed under the Apache License, Version 2.0 (the "License");
+* you may not use this file except in compliance with the License.
+* You may obtain a copy of the License at
+*
+* http://www.apache.org/licenses/LICENSE-2.0
+*
+* Unless required by applicable law or agreed to in writing, software
+* distributed under the License is distributed on an "AS IS" BASIS,
+* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+* See the License for the specific language governing permissions and
+* limitations under the License.
+*/
+
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+
+namespace MongoDB.Driver {
+    /// <summary>
+    /// Flags used with the Eval method in MongoDatabase.
+    /// </summary>
+    [Flags]
+    public enum EvalFlags {
+        /// <summary>
+        /// No flags.
+        /// </summary>
+        None = 0,
+        /// <summary>
+        /// Do not take a write lock.
+        /// </summary>
+        NoLock = 1
+    }
+}

DriverOnlineTests/Jira/CSharp216Tests.cs

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+/* Copyright 2010-2011 10gen Inc.
+*
+* Licensed under the Apache License, Version 2.0 (the "License");
+* you may not use this file except in compliance with the License.
+* You may obtain a copy of the License at
+*
+* http://www.apache.org/licenses/LICENSE-2.0
+*
+* Unless required by applicable law or agreed to in writing, software
+* distributed under the License is distributed on an "AS IS" BASIS,
+* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+* See the License for the specific language governing permissions and
+* limitations under the License.
+*/
+
+using System;
+using System.Collections.Generic;
+using System.IO;
+using System.Linq;
+using System.Runtime.Serialization;
+using System.Text;
+using NUnit.Framework;
+
+using MongoDB.Bson;
+using MongoDB.Bson.Serialization.Attributes;
+using MongoDB.Driver;
+using MongoDB.Driver.Builders;
+
+namespace MongoDB.DriverOnlineTests.Jira.CSharp216 {
+    [TestFixture]
+    public class CSharp216Tests {
+        private MongoServer server;
+        private MongoDatabase database;
+
+        [TestFixtureSetUp]
+        public void TestFixtureSetup() {
+            server = MongoServer.Create("mongodb://localhost/?safe=true");
+            database = server["onlinetests"];
+        }
+
+        [Test]
+        public void TestAmbiguousEvalArguments() {
+            var code = "function (x, y) { return y; }";
+            var objectArrayArg = new object[] { 1, 2, 3 };
+            var boolArg = true;
+            var result = database.Eval(code, objectArrayArg, boolArg); // before change boolArg was being misinterpreted as nolock argument
+            Assert.AreEqual(BsonType.Boolean, result.BsonType);
+            Assert.AreEqual(true, result.AsBoolean);
+        }
+
+        [Test]
+        public void TestNoLock() {
+            var code = "function (x, y) { return y; }";
+            var objectArrayArg = new object[] { 1, 2, 3 };
+            var boolArg = true;
+            var result = database.Eval(EvalFlags.NoLock, code, objectArrayArg, boolArg); // before change boolArg was being misinterpreted as nolock argument
+            Assert.AreEqual(BsonType.Boolean, result.BsonType);
+            Assert.AreEqual(true, result.AsBoolean);
+        }
+    }
+}