重新加载asp.net C＃

Question

I am working on a C# project using asp framework 4.5 and I am having this problem :

I want a way to avoid a resubmission of the form on page refresh (without self redirect):

When refreshing the page, the button does trigger itself, I need to avoid the second submission without page redirection . I am trying to upload a file, on the first try every thing is Working fine, but, when I hit f5 to refresh the page, the form will be resubmitted.

Answer 1

try below code

    public bool IsPageRefresh = false;
protected void Page_Load(object sender, EventArgs e)
    {
            if (!IsPostBack)
        {
              ViewState["postids"] = System.Guid.NewGuid().ToString();
            Session["postid"] = ViewState["postids"].ToString();

       }
        else
        {
            if (ViewState["postids"].ToString() != Session["postid"].ToString())
            {
                IsPageRefresh = true;
            }
            Session["postid"] = System.Guid.NewGuid().ToString();
            ViewState["postids"] = Session["postid"].ToString();
        }

 }

just check below condition on button click

 if (!IsPageRefresh)
     {
       // write you post code
      }

try this it's working perfect for me .