Fixed the bug that the existing task cannot be stopped after clicking the modbus slave disconnect button

Author: watte1997

ModbusSlave/ModbusSlave.csproj

@@ -134,6 +134,7 @@
     </Compile>
     <EmbeddedResource Include="SlaveForm.resx">
       <DependentUpon>SlaveForm.cs</DependentUpon>
+      <SubType>Designer</SubType>
     </EmbeddedResource>
     <None Include="app.config" />
     <None Include="Properties\Settings.settings">

ModbusSlave/SlaveForm.cs

@@ -154,6 +154,13 @@ private void DoDisconnect()
                 _uart.Dispose();
                 _uart = null;
             }
+
+            if (_socket != null)
+            {
+                _socket.Dispose();
+                _socket = null;
+            }
+
             if (_thread != null && _thread.IsAlive)
             {
                 if (_thread.Join(2000) == false)
@@ -162,11 +169,6 @@ private void DoDisconnect()
                     _thread = null;
                 }
             }
-            if (_socket != null)
-            {
-                _socket.Dispose();
-                _socket = null;
-            }
         }
 
         #endregion