Too many connection please how can be fix

Hi I am on the vps running for the server
but I got this error

"MySql.Data.MySqlClient.MySqlException: Too many connection"

when running about 15 to 30 min
with total login player of 15

please give me advice on this or what to do please...

here is the attach image

Handle your MySQL connection to avoid having 100 connections for no reasons :rolleyes: or change the maximum connection in your MySQL settings.

Dispose your connections and kill sleeping connections.

yes I should Dispose connection and kill sleeping connection, i have added the code you give me fang thanks very much but the problem is how to call the KillConnections.Kill();