asp.net method not work in gvresult event rowcommand (C#)

Question

this is my row command

protected void gvResult_RowCommand(object sender, GridViewCommandEventArgs e)
    {
        if (e.CommandName == "Download")
        {
            Response.Clear();
            Response.ContentType = "application/octect-stream";
            Response.AppendHeader("content-disposition", "filename=" + e.CommandArgument);
            Response.TransmitFile(Server.MapPath("~/Files/") + e.CommandArgument.ToString());
            Response.End();

            //updateCountDownloaded(e.CommandArgument.ToString());
            updateCountDownloaded("1");
        }        
    }

    public void updateCountDownloaded(string iDFile)
    {
        files.updateCountDownloaded(iDFile);
        BindTaskList();
    }

and this is the files

public void updateCountDownloaded(string IdFile)
    {
        SqlCommand command = new SqlCommand();
        command.CommandType = CommandType.Text;
        command.CommandText = string.Format(
            "UPDATE {0} SET Count = Count + 1 WHERE IdFile = @IdFile"
            ,tableName);
        command.Parameters.AddWithValue("@IdFile", IdFile);
        datalayer.setData(command);
    }

when i try run "updateCountDownloaded("1");" in Page_load, it work properly. but why it's doesnt work in rowcommand method? how can i resolv it. thx in advance

update: no exception, no error, but my table data not updated

Answer 1

In your row command you are flushing the file to the response and finish excecuting further by calling Response.End. What you can try is you can call your function before excecuting the other code as below.

protected void gvResult_RowCommand(object sender, GridViewCommandEventArgs e)
    {
        if (e.CommandName == "Download")
        {
           //updateCountDownloaded(e.CommandArgument.ToString());
            updateCountDownloaded("1");

            Response.Clear();
            Response.ContentType = "application/octect-stream";
            Response.AppendHeader("content-disposition", "filename=" + e.CommandArgument);
            Response.TransmitFile(Server.MapPath("~/Files/") + e.CommandArgument.ToString());
            Response.End();

        }        
    }