C# Mysql更新时出错：无法将数据写入传输连接

尝试更新时，我遇到以下错误：

我正在使用普通的mysql更新查询

 System.IO.IOException: Unable to write data to the transport connection: An existing connection was forcibly closed by the remote host. ---> System.Net.Sockets.SocketException: An existing connection was forcibly closed by the remote host
   at System.Net.Sockets.Socket.Send(Byte[] buffer, Int32 offset, Int32 size, SocketFlags socketFlags)
   at System.Net.Sockets.NetworkStream.Write(Byte[] buffer, Int32 offset, Int32 size)
   --- End of inner exception stack trace ---
   at System.Net.Sockets.NetworkStream.Write(Byte[] buffer, Int32 offset, Int32 size)
   at MySql.Data.MySqlClient.MySqlStream.SendPacket(MySqlPacket packet)
   at MySql.Data.MySqlClient.NativeDriver.ExecutePacket(MySqlPacket packetToExecute)
   at MySql.Data.MySqlClient.NativeDriver.SetDatabase(String dbName)
   at MySql.Data.MySqlClient.MySqlConnection.ChangeDatabase(String databaseName)
   at MySql.Data.MySqlClient.MySqlConnection.Open()
   at PushSMS.Form1.findSMS_Tick(Object sender, EventArgs e) in D:\PushSMS\Form1.cs:line 185 Frequency=1

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第185行的代码是什么？您能连接吗？检查正在使用的端口3306是否可以将源代码粘贴到此处重试{if connectToVr2.State==ConnectionState.Closed{connectToVr2.Open；}updatecmd=connectToVr2.CreateCommand；updatecmd.CommandText=strupdate；updatecmd.ExecuteOnQuery；}粘贴完整堆栈跟踪。这还不是全部。