diff --git a/src/Microsoft.Data.SqlClient/src/Microsoft/Data/Common/AdapterUtil.cs b/src/Microsoft.Data.SqlClient/src/Microsoft/Data/Common/AdapterUtil.cs
index 8db89b51b7..d7f6ce7cf0 100644
--- a/src/Microsoft.Data.SqlClient/src/Microsoft/Data/Common/AdapterUtil.cs
+++ b/src/Microsoft.Data.SqlClient/src/Microsoft/Data/Common/AdapterUtil.cs
@@ -784,7 +784,7 @@ internal static IndexOutOfRangeException CollectionIndexString(Type itemType, st
             => IndexOutOfRange(StringsHelper.GetString(Strings.ADP_CollectionIndexString, itemType.Name, propertyName, propertyValue, collection.Name));
 
         internal static InvalidCastException CollectionInvalidType(Type collection, Type itemType, object invalidValue)
-            => InvalidCast(StringsHelper.GetString(Strings.ADP_CollectionInvalidType, collection.Name, itemType.Name, invalidValue.GetType().Name));
+            => InvalidCast(StringsHelper.GetString(Strings.ADP_CollectionInvalidType, collection.Name, itemType.FullName, invalidValue.GetType().FullName));
 
         internal static ArgumentException ConvertFailed(Type fromType, Type toType, Exception innerException)
             => ADP.Argument(StringsHelper.GetString(Strings.SqlConvert_ConvertFailed, fromType.FullName, toType.FullName), innerException);
diff --git a/src/Microsoft.Data.SqlClient/tests/FunctionalTests/SqlParameterCollectionTest.cs b/src/Microsoft.Data.SqlClient/tests/FunctionalTests/SqlParameterCollectionTest.cs
index e93dbcc196..76043dc350 100644
--- a/src/Microsoft.Data.SqlClient/tests/FunctionalTests/SqlParameterCollectionTest.cs
+++ b/src/Microsoft.Data.SqlClient/tests/FunctionalTests/SqlParameterCollectionTest.cs
@@ -110,5 +110,15 @@ public void CollectionValiateNull_Throws()
 
             Assert.Throws<ArgumentNullException>(() => collection.Add(null));
         }
+
+        [Fact]
+        public void CollectionAddInvalidType_Throws()
+        {
+            SqlCommand command = new SqlCommand();
+            SqlParameterCollection collection = command.Parameters;
+
+            InvalidCastException ex = Assert.Throws<InvalidCastException>(() => collection.Add(new SqlCommand()));
+            Assert.Contains("Microsoft.Data.SqlClient.SqlCommand", ex.Message, StringComparison.OrdinalIgnoreCase);
+        }
     }
 }
diff --git a/src/Microsoft.Data.SqlClient/tests/ManualTests/SQL/ParameterTest/ParametersTest.cs b/src/Microsoft.Data.SqlClient/tests/ManualTests/SQL/ParameterTest/ParametersTest.cs
index fe0f1eb4a9..a213a8e148 100644
--- a/src/Microsoft.Data.SqlClient/tests/ManualTests/SQL/ParameterTest/ParametersTest.cs
+++ b/src/Microsoft.Data.SqlClient/tests/ManualTests/SQL/ParameterTest/ParametersTest.cs
@@ -36,6 +36,8 @@ public static void CodeCoverageSqlClient()
                 DataTestUtility.AssertThrowsWrapper<IndexOutOfRangeException>(() => failValue = opc[0].ParameterName, "Invalid index 0 for this SqlParameterCollection with Count=0.");
 
                 DataTestUtility.AssertThrowsWrapper<IndexOutOfRangeException>(() => failValue = opc["@p1"].ParameterName, "A SqlParameter with ParameterName '@p1' is not contained by this SqlParameterCollection.");
+
+                DataTestUtility.AssertThrowsWrapper<IndexOutOfRangeException>(() => opc["@p1"] = null, "A SqlParameter with ParameterName '@p1' is not contained by this SqlParameterCollection.");
             }
 
             DataTestUtility.AssertThrowsWrapper<ArgumentNullException>(() => opc.Add(null), "The SqlParameterCollection only accepts non-null SqlParameter type objects.");
@@ -95,11 +97,11 @@ public static void CodeCoverageSqlClient()
             new SqlCommand().Parameters.CopyTo(new object[0], 0);
             Assert.False(new SqlCommand().Parameters.GetEnumerator().MoveNext(), "FAILED: Expected MoveNext to be false");
 
-            DataTestUtility.AssertThrowsWrapper<InvalidCastException>(() => new SqlCommand().Parameters.Add(0), "The SqlParameterCollection only accepts non-null SqlParameter type objects, not Int32 objects.");
+            DataTestUtility.AssertThrowsWrapper<InvalidCastException>(() => new SqlCommand().Parameters.Add(0), "The SqlParameterCollection only accepts non-null Microsoft.Data.SqlClient.SqlParameter type objects, not System.Int32 objects.");
 
-            DataTestUtility.AssertThrowsWrapper<InvalidCastException>(() => new SqlCommand().Parameters.Insert(0, 0), "The SqlParameterCollection only accepts non-null SqlParameter type objects, not Int32 objects.");
+            DataTestUtility.AssertThrowsWrapper<InvalidCastException>(() => new SqlCommand().Parameters.Insert(0, 0), "The SqlParameterCollection only accepts non-null Microsoft.Data.SqlClient.SqlParameter type objects, not System.Int32 objects.");
 
-            DataTestUtility.AssertThrowsWrapper<InvalidCastException>(() => new SqlCommand().Parameters.Remove(0), "The SqlParameterCollection only accepts non-null SqlParameter type objects, not Int32 objects.");
+            DataTestUtility.AssertThrowsWrapper<InvalidCastException>(() => new SqlCommand().Parameters.Remove(0), "The SqlParameterCollection only accepts non-null Microsoft.Data.SqlClient.SqlParameter type objects, not System.Int32 objects.");
 
             DataTestUtility.AssertThrowsWrapper<ArgumentException>(() => new SqlCommand().Parameters.Remove(new SqlParameter()), "Attempted to remove an SqlParameter that is not contained by this SqlParameterCollection.");
         }