diff --git a/S7.Net/PlcAsynchronous.cs b/S7.Net/PlcAsynchronous.cs
index c6d7388..2f481e4 100644
--- a/S7.Net/PlcAsynchronous.cs
+++ b/S7.Net/PlcAsynchronous.cs
@@ -324,9 +324,9 @@ namespace S7.Net
             if (bitAdr != -1)
             {
                 //Must be writing a bit value as bitAdr is specified
-                if (value is bool)
+                if (value is bool boolean)
                 {
-                    await WriteBitAsync(dataType, db, startByteAdr, bitAdr, (bool) value);
+                    await WriteBitAsync(dataType, db, startByteAdr, bitAdr, boolean);
                 }
                 else if (value is int intValue)
                 {
diff --git a/S7.Net/PlcSynchronous.cs b/S7.Net/PlcSynchronous.cs
index bf0a1a3..8cf5f89 100644
--- a/S7.Net/PlcSynchronous.cs
+++ b/S7.Net/PlcSynchronous.cs
@@ -289,9 +289,9 @@ namespace S7.Net
             if (bitAdr != -1)
             {
                 //Must be writing a bit value as bitAdr is specified
-                if (value is bool)
+                if (value is bool boolean)
                 {
-                    WriteBit(dataType, db, startByteAdr, bitAdr, (bool) value);
+                    WriteBit(dataType, db, startByteAdr, bitAdr, boolean);
                 }
                 else if (value is int intValue)
                 {
@@ -442,7 +442,6 @@ namespace S7.Net
 
         private byte[] BuildWriteBitPackage(DataType dataType, int db, int startByteAdr, bool bitValue, int bitAdr)
         {
-            var stream = GetStreamIfAvailable();
             var value = new[] { bitValue ? (byte)1 : (byte)0 };
             int varCount = 1;
             // first create the header
diff --git a/S7.Net/Protocol/S7WriteMultiple.cs b/S7.Net/Protocol/S7WriteMultiple.cs
index 2738a34..853e1e5 100644
--- a/S7.Net/Protocol/S7WriteMultiple.cs
+++ b/S7.Net/Protocol/S7WriteMultiple.cs
@@ -17,7 +17,6 @@ namespace S7.Net.Protocol
                 (ushort) (2 + paramSize));
 
             var paramOffset = Header.Template.Length;
-            var dataOffset = paramOffset + paramSize;
             var data = new ByteArray();
 
             var itemCount = 0;
diff --git a/S7.Net/Protocol/Serialization.cs b/S7.Net/Protocol/Serialization.cs
index 5e4c98e..3ecee55 100644
--- a/S7.Net/Protocol/Serialization.cs
+++ b/S7.Net/Protocol/Serialization.cs
@@ -75,9 +75,9 @@ namespace S7.Net.Protocol
         {
             var start = startByte * 8 + bitNumber;
             buffer[index + 2] = (byte)start;
-            start = start >> 8;
+            start >>= 8;
             buffer[index + 1] = (byte)start;
-            start = start >> 8;
+            start >>= 8;
             buffer[index] = (byte)start;
         }