Get the Correlation Id of the current request in SharePoint

MyPage.aspx.cs

public partial class overview : Page
{
    [DllImport("advapi32.dll")]
    public static extern uint EventActivityIdControl(uint controlCode, ref Guid activityId);

    protected void Page_Load(object sender, EventArgs e)
    {
        var correlationId = new Guid();
        EventActivityIdControl(1, ref correlationId);
        
        // Now you have the current correlation id.
     }
}