This how to solve?

CodePudding user response:

The DataReader used up before the Connection cannot be shut down
So check the DBHelper. Whether ExecuteReader closed the Connection

CodePudding user response:

See also: https://blog.csdn.net/weixin_39125665/article/details/78454415

CodePudding user response:

Solve the , thank you

CodePudding user response:

Solve the , thank you