Post Back does not work after writing files to response in ASP.NET

Question

What I have?

I have an ASP.NET page which allows the user to download file a on a button click. User can select the file he wants from

Answer 1

I had same problem. Function to perform simple Response.Writer("") on Button Click event on aspx page was never firing.

Method in class:

public test_class()
{
    public test_class() { }

    public static void test_response_write(string test_string) 
    {
        HttpContext context = HttpContext.Current;
        context.Response.Clear();
        context.Response.Write(test_string);
        context.Response.End();                   
    }
}

ASPX Page:

protected void btn_test_Click(object sender, EventArgs e)
{
    test_class.test_response_write("testing....");
}

While I was trying to find the reason, I just called same function on Page_Load event it worked.

protected void Page_Load(object sender, EventArgs e)
{
    if (!IsPostBack)
    {
        test_class.test_response_write("testing....");
    }
}

Investigating the issue I found out that Master Page of that aspx page's body was under .

I removed it, and it worked on Button_Click Event. I would recommend you to check that too.