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copied!<p>I was able to create a testing code. in FF and chrome seems to work fine (1 submit) but the IE9 (and compatibility version) seems to hit 1, 2 or 3 times. NOTE: the submit() cause the postback. CASE 1. delay in Javascript Page:</p> <pre><code><html xmlns="http://www.w3.org/1999/xhtml"> <head runat="server"> <title>testing</title> <script type="text/javascript"> function submitForm() { document.forms[0].submit(); alert("delay"); document.forms[0].submit(); } </script> </head> <body> <form id="form1" name="form1" runat="server"> <div> <asp:TextBox ID="TextBox1" runat="server" Width="220px"></asp:TextBox> <button onclick="submitForm(this)">CLICK</button> <br /> <asp:Label ID="Label1" runat="server"></asp:Label> </div> </form> </body> </html> </code></pre> <p>Code behind:</p> <pre><code>protected void Page_Load(object sender, EventArgs e) { if(IsPostBack) { incrementVal(); } } private void incrementVal() { var val = (int)(Session["val_" + TextBox1.Text] ?? 0); val++; Label1.Text += TextBox1.Text + ": " + val.ToString("00") + " - " + DateTime.Now.ToLongTimeString() + "<br/>"; Session["val_" + TextBox1.Text] = val; } </code></pre> <p><img src="https://i.stack.imgur.com/IATyI.png" alt="enter image description here"></p> <p>CASE 2: Slow Response</p> <p>remove JS Alert:</p> <pre><code>function submitForm() { document.forms[0].submit(); document.forms[0].submit(); } </code></pre> <p>add delay in the server side:</p> <pre><code>if(IsPostBack) { incrementVal(); Thread.Sleep(500); } </code></pre>

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