Textbox remembers its data on page refresh

Question

I have 2 textbox on my page and a Button. When I click on a button, the text from the textbox is emailed. But, then when i refresh the page and no content is there, then also i get an email.

protected void Button1_Click(object sender, EventArgs e)
{
    if (!string.IsNullOrEmpty(TextBox1.Text) && !string.IsNullOrEmpty(TextBox2.Text))
    {
           //email logic
           TextBox1.Text = "";
           TextBox2.Text = "";

    }

    else
    {
    //do nothing
    }
 }

Here, on clicking the button, i get an email but then when i refresh the page, even though there is no data, then also it goes inside the loop and i get an email.

How do i stop this ?

Post data are part of request, all values are stored in it and after you hit F5, you are resending request not creating new one. That is a reason why you are getting new email. — TheLittleHawk, Dec 01 '14 at 01:12
possible duplicate of [Post-Redirect-Get with ASP.NET](http://stackoverflow.com/questions/5381162/post-redirect-get-with-asp-net) — Win, Dec 01 '14 at 01:20

Sam · Accepted Answer · 2014-12-01T02:17:40.303

1

Do the following in your Page_Load event and keep your TextBoxes and Button in an <asp:UpdatePanel>. Then the page will not ask to re-submit each time you refresh the page.

protected void Page_Load(object sender, EventArgs e)
{
    if (!IsPostBack)
    {
        TextBox1.Text = string.Empty;
        TextBox2.Text = string.Empty;
    }
}

UPDATE

Keep the controls within an UpdatePanel as follows

<asp:UpdatePanel ID="UpdatePanel1" runat="server" UpdateMode="Conditional" >
<ContentTemplate>
    <asp:TextBox ID="TextBox1" runat="server"></asp:TextBox>
    <asp:TextBox ID="TextBox2" runat="server"></asp:TextBox>
    <asp:Button ID="Button1" runat="server" Text="Send mail" onclick="Button1_Click" />            
</ContentTemplate>
</asp:UpdatePanel>

edited Dec 01 '14 at 02:17

answered Dec 01 '14 at 01:13

Sam

2,917
1
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what do you mean by keeping in ?? – user1989 Dec 01 '14 at 02:11
Sorry, keep your controls in an UpdatePanel – Sam Dec 01 '14 at 02:14
Awesome, it worked. But can you explain me why it worked, when i kept the control in update panel ? – user1989 Dec 01 '14 at 03:27
1

Because it's using Ajax and does a partial update. And, Script manager takes care of the page refresh issue you faced before. It only submits the form once how many time you refresh the page. – Sam Dec 01 '14 at 03:30

score 0 · Answer 2 · edited May 23 '17 at 12:20

0

You need to use the the POST > Redirect > GET pattern. Here is explanation link

edited May 23 '17 at 12:20

Community

1
1

answered Dec 01 '14 at 01:14

TheLittleHawk

628
3
22

Textbox remembers its data on page refresh

2 Answers2