User Control events - asp.net

Question

I have a problem while writting event for ImageUpload User control.
I want to add a event that fire on imagebutton click in this case that green ok button. I write some code for event but it get raised on pageload() and on postback, so it causes a problem --> Image path which is provided for image upload is get clear after image upload but on a page refresh a same image is upload again and again on every page refresh.
User Control Code
public partial class Gallery_Controls_ImgUpload : System.Web.UI.UserControl
{
protected void Page_Load(object sender, EventArgs e)
{ }
public string TxtDesc
{
get {return txtimgdesc.Text;}
set { txtimgdesc.Text = value; }
}
public string TxtImgName
{
get { return txtimgname.Text; }
set { txtimgname.Text = value; }
}
public FileUpload ImgUpld
{
get { return ImgUpload; }
//set { ImgUpload = value; }
}
public string ImgAttr
{
get { return ImgUpload.Attributes["onchange"]; }
set { ImgUpload.Attributes["onchange"] = value; }
}
public event EventHandler ImgBtnUpClick;
protected void imgbtnok_Click(object sender,EventArgs e)
{
ImgBtnUpClick(ImgUpload, e);
}
Code for Adding control in page and upload a file
public partial class Gallery_iupload : System.Web.UI.Page
{
ASP.gallery_controls_imgupload_ascx upctrl;
protected void Page_Load(object sender, EventArgs e)
{
upctrl = (ASP.gallery_controls_imgupload_ascx)LoadControl ("Controls/ImgUpload.ascx");
upctrl.ImgBtnUpClick += new EventHandler(Upload);
upctrl.ImgAttr = "checkFileExtension(this); return false;";
PlaceHolderupctrl.Controls.Add(upctrl);
}
protected void Upload(object sender, EventArgs e)
{
TextBox txtbximgname = (TextBox)upctrl.FindControl("txtimgname");
TextBox txtbxdesc = (TextBox)upctrl.FindControl("txtimgdesc");
FileUpload Imgload = (FileUpload)sender;
if (Imgload.HasFile)
try{
Imgload.SaveAs("C:\\Uploads\\" + txtbximgname.Text + ".jpg");
Label1.Text = "File name: " + Imgload.PostedFile.FileName + "<br>" +
Imgload.PostedFile.ContentLength + " kb<br>" +"Content type: " +
Imgload.PostedFile.ContentType;
}
catch (Exception ex)
{
Label1.Text = "ERROR: " + ex.Message.ToString();
}
else
{
Label1.Text = "You have not specified a file.";
}
}
}

Answer 1

you have to put a IsPostBack check in your page_load:
protected void Page_Load(object sender, EventArgs e)
{
if (!Page.IsPostBack)
{ upctrl = (ASP.gallery_controls_imgupload_ascx)LoadControl ("Controls/ImgUpload.ascx");
upctrl.ImgBtnUpClick += new EventHandler(Upload);
upctrl.ImgAttr = "checkFileExtension(this); return false;";
PlaceHolderupctrl.Controls.Add(upctrl);
}
}