TEST/TEST_Prj/app_sql/app_sql/App.config

<?xml version="1.0"?>
<configuration>
    <configSections>
    </configSections>
    <connectionStrings>
        <add name="app_sql.Properties.Settings.studentsConnectionString"
            connectionString="server=localhost;user id=root;password=123456;database=students"
            providerName="MySql.Data.MySqlClient" />
    </connectionStrings>
    <startup> 
        <supportedRuntime version="v4.0" sku=".NETFramework,Version=v4.5.2"/>
    </startup>
</configuration>