Custom Event Receiver - Copy To Folder

SPFile sourceFile = properties.ListItem.File;
SPFile destFile; // Copy file from source library to destination         
using (Stream stream = sourceFile.OpenBinaryStream())
{
    var destLib = (SPDocumentLibrary) properties.ListItem.Web.Lists[listName];
    destFile = destLib.RootFolder.Files.Add(sourceFile.Name, stream);
    stream.Close();
} 
// Update item properties         
SPListItem destItem = destFile.Item;
SPListItem sourceItem = sourceFile.Item;
// Copy meta data
destItem["Title"] = sourceItem["Title"];
//...        
//... destItem["FieldX"] = sourceItem["FieldX"];        
//...         
destItem.UpdateOverwriteVersion();

//Ensure folder here 

var destFolder = destLib.RootFolder.SubFolders["name"]; 

destFile = destFolder.Files.Add(sourceFile.Name, stream);Custom Event Receiver - Copy To Folder