NLog rename old file changing the original file name

I’m working with Nlog in an Asp.net framework application in a lan enviroment.
I have 10 different clients that use the application. My goal is to have different log file, one for each client. My Nlog configuration is:

<target name="LogFile"
    xsi:type="File"
    fileName="D:logs${var:idClient}.txt"
    keepFileOpen="true"
    archiveFileName="D:logsOld${var:idClient}_{#}.txt"
    archiveDateFormat="yyyyMMdd"
    archiveNumbering="Date"
    archiveEvery="Day"
    layout="${var:idClient}|${longdate}|${level:uppercase=true}|${callsite:fileName=false:includeSourcePath=false}|${message}"/>
</targets>

In the Global.asax:

protected void Application_AcquireRequestState(object sender, EventArgs e)
{
        HttpContext context = HttpContext.Current;

        string idClient= string.Empty;
        if (context.Session == null || context.Session["ClientId"] == null ||
            string.IsNullOrEmpty(context.Session["ClientId"].ToString()))
            idClient= "Client ID Default";
        else
            idClient= System.Web.HttpContext.Current.Session["ClientId"]?.ToString();

        NLog.LogManager.Configuration.Variables["idClient"] = idClient;
}

My problem is that the old file name doesn’t have the same client id of the original log file. How can I mantain the same client id and add only the data?

Thanks.

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Answers:

Method 1

Answers:

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Method 1

NLog config variables are global for the entire application. It is not a good idea to modify them for every request, unless you promise to only have a single request at a time.

Instead consider adding NLog.Web-nuget-package to your project and change your filetarget to use this FileName-layout:

    <extensions>
      <add assembly="NLog.Web"/>
    </extensions>
    <targets>
      <target name="LogFile" xsi:type="File"
        fileName="D:logs${aspnet-session:ClientId:whenEmpty=DefaultClientId}.txt" />
    </targets>

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