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Editorial Team
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Asked: 2026-05-31T12:41:54+00:00

I would like to prevent a user from either: Copy and pasting from the

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I would like to prevent a user from either:

  1. Copy and pasting from the first textbox to the second
  2. Right-click and use the context menu to copy and paste from the first textbox to the second.

This is not working.

<html>
  <head runat="server">
    <title>Confirm email page</title>
    <script  type="text/javascript" language="javascript">
    function DisableRightClick(event) {
        //For mouse right click 
        if (event.button == 2) {

        }
    }
    function DisableCtrlKey(e) {
        var code = (document.all) ? event.keyCode : e.which;
        // look for CTRL key press
        if (parseInt(code) == 17) {
            window.event.returnValue = false;
        }
    }
    </script>

  </head>
  <body style="font-family: Verdana; font-size: 1em">
    <form id="form1" runat="server">
      <div>
        <h1>Confirm Email</h1>
        <asp:Label ID="Label2" runat="server" Text="Enter Email Address: "></asp:Label>
        <asp:TextBox ID="TextBox2" runat="server" oncopy="return false" onMouseDown="DisableRightClick(event)" ></asp:TextBox><br />
        <asp:Label ID="Label3" runat="server" Text="Confirm Email Address: "></asp:Label>
        <asp:TextBox ID="TextBox3" runat="server" onKeyDown="return DisableCtrlKey(event)"></asp:TextBox><br />
      </div>
    </form>
  </body>
</html>

GOT IT WORKING!!!!

<div>
<h1>Copy Paste Preventer!!!</h1>
    <asp:Label ID="Label1" runat="server" Text="Enter Username: "></asp:Label>
    <asp:TextBox ID="TextBox1" runat="server"></asp:TextBox><br />
    <asp:Label ID="Label2" runat="server" Text="Enter Email Address: "></asp:Label>
    <asp:TextBox ID="email" runat="server"  oncopy="return false" onpaste="return false" oncut="return false" oncontextmenu="forms[0].elements[0].value++; return false"></asp:TextBox><br />
    <asp:Label ID="Label3" runat="server" Text="Confirm Email Address: "></asp:Label>
    <asp:TextBox ID="TextBox3" runat="server" oncopy="return false" onpaste="return false" oncut="return false" oncontextmenu="forms[0].elements[0].value++; return false"> </asp:TextBox><br />
</div>
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1 Answer

  1. Editorial Team
    <div>
<h1>Copy Paste Preventer!!!</h1>
    <asp:Label ID="Label1" runat="server" Text="Enter Username: "></asp:Label>
    <asp:TextBox ID="TextBox1" runat="server"></asp:TextBox><br />
    <asp:Label ID="Label2" runat="server" Text="Enter Email Address: "></asp:Label>
    <asp:TextBox ID="email" runat="server"  oncopy="return false" onpaste="return false" oncut="return false" oncontextmenu="forms[0].elements[0].value++; return false"></asp:TextBox><br />
    <asp:Label ID="Label3" runat="server" Text="Confirm Email Address: "></asp:Label>
    <asp:TextBox ID="TextBox3" runat="server" oncopy="return false" onpaste="return false" oncut="return false" oncontextmenu="forms[0].elements[0].value++; return false"> </asp:TextBox><br />
</div>
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