How to respond without html in asp.net

You can clear the previous response buffer and write your new output.

Response.Clear(); // clear response buffer
Response.Write("test"); // write your new text
Response.End(); // end the response so it is sent to the client

Make sure in your *.aspx file, at the top you have AutoEventWireup="true", if it's false (or not there?) your Page_Load event handler will not be called.

Also, make sure you compiled your page.

Another suggestion is to use a Generic Handler (ie *.ashx), these do not use the typical webforms lifecycle and might be better suited to what you're doing.

I think you're looking for :

    protected void Page_Load(object sender, EventArgs e)
    {
        Response.ContentType = "text/plain";
        Response.Write("test");
        Response.End(); 

    }