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);      
    }                  
}