This
article will show you how you can generate the OTP in asp.net using C# and send
it via SMS for verification using c#.net.
So in this article first we will create a new asp.net application and add a page for generating the OTP.
<%@ Page Language="C#" AutoEventWireup="true" CodeBehind="SendOTP.aspx.cs" Inherits="Shoping_Cart.SendOTP" %>
<!DOCTYPE html>
<html xmlns="http://www.w3.org/1999/xhtml">
<head runat="server">
<title>How to Send and
Verify OTP On Mobile No Using C# In Asp.Net</title>
</head>
<body>
<form id="form1" runat="server">
<div>
Mobile
No:
<asp:TextBox ID="txtMobileNo"
runat="server" Width="241px"></asp:TextBox>
<asp:Button ID="Button1" runat="server" OnClick="Button1_Click" Text="Send OTP" />
<br />
<asp:Label ID="lblMessage"
runat="server" style="color: #FF0000" Text=""></asp:Label>
</div>
</form>
</body>
</html>
|
Now on button
click we will add the below code.
using System;
using
System.Collections.Generic;
using System.IO;
using System.Linq;
using System.Net;
using System.Web;
using System.Web.UI;
using
System.Web.UI.WebControls;
namespace Shoping_Cart
{
public partial class SendOTP : System.Web.UI.Page
{
protected void Page_Load(object sender, EventArgs e)
{
}
protected void Button1_Click(object sender, EventArgs e)
{
try
{
//For generating OTP
Random r = new Random();
string OTP =
r.Next(1000, 9999).ToString();
//Send message
string Username = "youremail@domain.com";
string APIKey = "YourHash";//This may vary api to api. like ite may be password,
secrate key, hash etc
string SenderName = "MyName";
string Number = "9876543210";
string Message = "Your OTP code is - " + OTP;
string URL = "http://api.urlname.in/send/?username=" + Username + "&hash=" + APIKey + "&sender=" + SenderName + "&numbers=" + Number + "&message=" + Message;
HttpWebRequest req =
(HttpWebRequest)WebRequest.Create(URL);
HttpWebResponse resp
= (HttpWebResponse)req.GetResponse();
StreamReader sr = new StreamReader(resp.GetResponseStream());
string results =
sr.ReadToEnd();
sr.Close();
//Store the OTP in session to verify in next page.
//If you want to verify from DB store the OTP in DB for
verification. But it will take space
Session["OTP"] = OTP;
//Redirect for varification
Response.Redirect("VerifyOTP.aspx");
}
catch (Exception ex)
{
lblMessage.Text = ex.Message.ToString();
}
}
}
}
|
In above code I have generated the OTP of four digit,. After generating the send the OPT to sms using SMS api with the help of HttpWebRequest. For this you need SMP appi account detail.
After
generating OPT I have stored the OPT in session and then redirected to the next
page. By doing this we don’t need to store the OTP in DB. Just redirect the verification
page.
Here is the
code of verification page.
<%@ Page Language="C#" AutoEventWireup="true" CodeBehind="VerifyOTP.aspx.cs" Inherits="Shoping_Cart.VerifyOTP" %>
<!DOCTYPE html>
<html xmlns="http://www.w3.org/1999/xhtml">
<head runat="server">
<title>Verify OTP</title>
</head>
<body>
<form id="form1" runat="server">
<div>
OTP:
<asp:TextBox ID="txtOTP" runat="server" Width="241px"></asp:TextBox>
<asp:Button ID="Button1" runat="server" OnClick="Button1_Click"
Text="Verify
OTP" />
<br />
<asp:Label ID="lblMessage"
runat="server" style="color: #FF0000" Text=""></asp:Label>
</div>
</form>
</body>
</html>
|
Code for
OPT verification page.
using System;
using
System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.UI;
using
System.Web.UI.WebControls;
namespace Shoping_Cart
{
public partial class VerifyOTP : System.Web.UI.Page
{
protected void Page_Load(object sender, EventArgs e)
{
}
protected void Button1_Click(object sender, EventArgs e)
{
if (Session["OTP"].ToString()
== txtOTP.Text)
{
lblMessage.Text = "You have
enter correct OTP.";
Session["OTP"] = null;
}
else
{
lblMessage.Text = "Pleae
enter correct OTP.";
}
}
}
}
|
Here I have checked the session value with the entered value. If it’s match you can proceed to next level. Otherwise throw error message.
Now lets
execute and check the processing.
Now on
verification page add a wrong OTP. You will get error message.
Now enter
correct OPT you will get success message.
About the Author
The underlying connection was closed: The connection was closed unexpectedly.
ReplyDeletethis error display at runtime. gives solution
Please check your connection string
DeleteResend otp code and otp time show display and warnings page not close and refreshing
ReplyDeleteNot able to understand you issue. Please explain it.
Deletethe string url that need to put what url?
ReplyDeleteHere URL is the SMS API url which u get from your service provider.
DeleteObject reference not set to an instance of an object
ReplyDeleteHi Badal,
DeleteIn which line of code you are getting error.
I have used the code. There are no error but the I'm not get the varification. Why?
ReplyDeletei want to reset password by gmail auto generate otp
ReplyDeleteFor that u need to enable pop in gmail and then user code to send email having random password string,
Deletei want to reset password by gmail auto generate otp in asp.net mvc
ReplyDeleteHelp me this, please " The remote name could not be resolved: 'api.urlname.in'"
ReplyDeletewhen i fill in a phone no and click sendOTP
same issue with me
Deletefg
ReplyDeleteParser Error
ReplyDeleteDescription: An error occurred during the parsing of a resource required to service this request. Please review the following specific parse error details and modify your source file appropriately.
Parser Error Message: Could not load type 'Shoping_Cart.VerifyOTP'.
Source Error:
Line 1: <%@ Page Language="C#" AutoEventWireup="true" CodeBehind="VerifyOTP.aspx.cs" Inherits="Shoping_Cart.VerifyOTP" %>
Line 2:
Line 3:
Source File: /VerifyOTP.aspx Line: 1
Version Information: Microsoft .NET Framework Version:4.0.30319; ASP.NET Version:4.6.1590.0
Server Error in '/' Application.
ReplyDeleteParser Error
Description: An error occurred during the parsing of a resource required to service this request. Please review the following specific parse error details and modify your source file appropriately.
Parser Error Message: Could not load type 'SendOTP'.
Source Error:
Line 1: <%@ Page Language="C#" AutoEventWireup="true" CodeBehind="SendOTP.aspx.cs" Inherits="SendOTP" %>
Line 2:
Line 3:
Source File: /SendOTP.aspx Line: 1
Version Information: Microsoft .NET Framework Version:4.0.30319; ASP.NET Version:4.6.1590.0
getting error while i have attempt this
ReplyDeleteThe remote server returned an error: (405) Method Not Allowed.