Posted By

satie83 on 05/17/12


Tagged

refresh aspnet c# IsPageRefresh


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IsPageRefresh in ASP .NET - Preventing previously submitted


 / Published in: C#
 

URL: http://www.dotnetspider.com/resources/4040-IsPageRefresh-ASP-NET.aspx

How do I prevent previously submitted form data from being reinserted into the database when the user presses the browser's Refresh button? Although it is not possible due to unique key constraint available in tables but it is unnecessary go to other layer (data access, business layer).

  1. // declare a global variable on page
  2. private Boolean IsPageRefresh = false;
  3. protected void Page_Load(object sender, EventArgs e)
  4. {
  5. if (!IsPostBack)
  6. {
  7. ViewState["postids"] = System.Guid.NewGuid().ToString();
  8. Session["postid"] = ViewState["postids"].ToString();
  9. TextBox1.Text = "Hi";
  10.  
  11. }
  12. else
  13. {
  14. if (ViewState["postids"].ToString() != Session["postid"].ToString())
  15. {
  16. IsPageRefresh = true;
  17. }
  18. Session["postid"] = System.Guid.NewGuid().ToString();
  19. ViewState["postids"] = Session["postid"];
  20. }
  21. }
  22. protected void Button1_Click(object sender, EventArgs e)
  23. {
  24. if (!IsPageRefresh) // check that page is not refreshed by browser.
  25. {
  26. TextBox2.Text = TextBox1.Text + "@";
  27.  
  28. }
  29. }

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