c# Upload Handler

I thought i could write my own c# file handler.

so i made a simple handler

...
public class CmsUploadHandler : IHttpHandler
{
public void ProcessRequest(HttpContext context)
{
string strFileName = Path.GetFileName(context.Request.Files[0].FileName);
string strSaveLocation = context.Server.MapPath("~/Uploads/") + strFileName;

context.Request.Files[0].SaveAs(strSaveLocation);
context.Response.ContentType = "text/plain";
context.Response.Write("~/Uploads/" + strFileName);
}

public bool IsReusable
{
get {
return false;
}
}
}

The handler works fine, the image is uploaded to the correct directory, but...

im not sure what i should pass back to CKEditor in order to let it know that the image was uploaded.

I get a message saysing Image Source Url Is Missing

I assume this is because i am not sending the correct thing back from my handler.

Anyone know what i should be doing to integrate my handler with CKEditor?

ps im using the most recent version downloaded from the stie.