NoBot Properties:

·         ResponseMinimumDelaySeconds - minimum number of seconds before which a response (postback) is considered invalid.

·         CutoffWindowSeconds - Optional number of seconds specifying the length of the cutoff window that tracks previous postbacks from each IP address.

·         CutoffMaximumInstances - Optional maximum number of postbacks to allow by a single IP addresses within the cutoff window.

·         Valid: When NoBot control verifies the actions performed by a user and it passes all the tests then the user is considered as human.

·         InvalidBadResponse: When challenge script fails the test then AJAX NoBot control returns the bad response.

·         InvalidResponseTooSoon: When postback occurs more quickly than a specified ResponseMinimumDelaySeconds.

·         InvalidAddressTooActive: When a single client’s IP remains active for a long time and performs number of postback then it returns the InvalidAddressTooActive.

·         InvalidBadSession: When ASP.Net Session State becomes unusable.

Code:

Write these codes on aspx page

 <%-- ScriptManager control manages client script for AJAX enabled ASP.NET pages.This enables partial-page rendering and Web-service calls.You have to used this if you want to use ajax control toolkit--%>
<asp:ScriptManager ID="ScriptManager1" runat="server"></asp:ScriptManager>
 <%-- Add NoBot Control--%>
  
<cc1:NoBot ID="NoBot1" runat="server" Enabled="true" CutoffMaximumInstances="1" CutoffWindowSeconds="2" ResponseMinimumDelaySeconds="5" />
 <%-- Add Panel and some control--%>
  
<asp:Panel ID="Panel1" runat="server">
 <asp:Label ID="Label1" runat="server" Text=" User Id"></asp:Label>
 <asp:TextBox ID="TextBox1" runat="server" Text="Id"></asp:TextBox>
 <br />
 <asp:Label ID="Label2" runat="server" Text="Password"></asp:Label>
 <asp:TextBox ID="TextBox2" runat="server" Text="12"></asp:TextBox>
 <br />
 <asp:Button ID="Button1" runat="server" Text="Button" OnClick="Button1_Click" />
 <asp:Label ID="Label3" runat="server" Text=""></asp:Label>
 <asp:Label ID="Label4" runat="server" Text=""></asp:Label>
</asp:Panel>

Here ResponseMinimumDelaySeconds="5" indicate that user should submit form after 5 second and if user click before 5 second then error message will show.

Write these code on Button1 click

protected void Button1_Click(object sender, EventArgs e)
{
       NoBotState state;        
       if (NoBot1.IsValid(out state)) //Check the condition is valid or not
            Label3.Text = state.ToString();      
       else            
Label3.Text = "Page not valid";
          
StringBuilder sb = new StringBuilder();//Make the object of StringBuilder
foreach (KeyValuePair<DateTime, string> keyValue in NoBot.GetCopyOfUserAddressCache())
      {
            sb.Append(keyValue.Value);
      }
      Label4.Text = sb.ToString();
}

Run the project

In this example ResponseMinimumDelaySeconds="5"  so if you clickSubmit button before 5 second then error message will show and it will also show the IP address.

If you click submit button after 5 second then error message will not show.