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Generate unique OTP in asp.net using C#, vb.net

In this article I am going to explain how to generate unique OTP (one time password) in asp.net

Description:

OTP stand for one time password. It is a password that is valid for only one login session or transaction. It is widely used by the banks for transactions. It can be numeric as well as alphanumerical.

Implementation:

Method (code) to generate the numeric OTP:
Add a webform to project. Drag and drop the required control from toolbox to webform. Below given html markup consist of button and label control.

HTML markup:
   <fieldset style="width:420px">
    <legend><strong>OTP Example</strong></legend>
     <table>
    <tr><td>Click to Generate OTP :</td><td>
        <asp:Button ID="Button1" runat="server" Text="Generate OTP"/></td></tr>
     <tr><td></td><td></td></tr>
      <tr id="idotp" runat="server" visible="false"><td><strong>OTP</strong> :</td><td>
          <asp:Label ID="lblotp" runat="server"></asp:Label></td></tr>
    </table>
    </fieldset>

Generate numeric OTP
On button click write the below given to generate OTP:
C# code:

protected void Button1_Click(object sender, EventArgs e)
    {
        GenerateOTP();
    }

    private void GenerateOTP()
    {
        try
        {
            int length = 6;
            string numbers = "0123456789";
            Random objrandom = new Random();
            string strrandom = string.Empty;
            int noofnumbers = length;
            for (int i = 0; i < noofnumbers; i++)
            {
                int temp = objrandom.Next(0, numbers.Length);
                strrandom += temp;
            }
            lblotp.Text = strrandom;
            idotp.Visible = true;
        }
        catch (Exception ex)
        {
        }
    }

VB.net Code:
Protected Sub Button1_Click(ByVal sender As Object, ByVal e As System.EventArgs) Handles Button1.Click
        GenerateOTP()
    End Sub

    Private Sub GenerateOTP()
        Try
            Dim length As Integer = 6
            Dim numbers As String = "0123456789"
            Dim objrandom As New Random()
            Dim strrandom As String = String.Empty
            Dim noofnumbers As Integer = length
            For i As Integer = 0 To noofnumbers - 1
                Dim temp As Integer = objrandom.[Next](0, numbers.Length)
                strrandom += temp
            Next
            lblotp.Text = strrandom
            idotp.Visible = True
        Catch ex As Exception
        End Try
    End Sub


Method (code) to generate Alphanumeric OTP:

HTML Markup:
   <fieldset style="width:420px">
    <legend><strong>OTP Example</strong></legend>
     <table>
    <tr><td>Click to Generate OTP :</td><td>
        <asp:Button ID="Button1" runat="server" Text="Generate OTP"/></td></tr>
     <tr><td></td><td></td></tr>
      <tr id="idotp" runat="server" visible="false"><td><strong>OTP</strong> :</td><td>
          <asp:Label ID="lblotp" runat="server"></asp:Label></td></tr>
    </table>
    </fieldset>

Generate alphanumeric OTP:
Write the below given code on button click event to generate the alphanumeric OTP.
C# Code:
  protected void Button1_Click(object sender, EventArgs e)
    {
        GenerateOTP(10);
    }
 
  private void GenerateOTP(int length)
    {
        try
        {
            string numbers = "0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz";           
            Random objrandom = new Random();
            string strrandom = string.Empty;
            string passwordString = "";
            string opt = "";
            int noofnumbers = length;
            for (int i = 0; i < noofnumbers; i++)
            {
                int temp = objrandom.Next(0, numbers.Length);
                passwordString = numbers.ToCharArray()[temp].ToString();
                strrandom += passwordString;
            }
            while (opt.IndexOf(passwordString) != -1) ;
            lblotp.Text = strrandom;
            idotp.Visible = true;
        }
        catch (Exception ex)
        {
        }
    }

VB.net Code: 
    Protected Sub Button1_Click(ByVal sender As Object, ByVal e As System.EventArgs) Handles Button1.Click
        GenerateOTP(10)
    End Sub
  
 Private Sub GenerateOTP(ByVal length As Integer)
        Try
            Dim numbers As String = "0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz"
            Dim objrandom As New Random()
            Dim strrandom As String = String.Empty
            Dim passwordString As String = ""
            Dim opt As String = ""
            Dim noofnumbers As Integer = length
            For i As Integer = 0 To noofnumbers - 1
                Dim temp As Integer = objrandom.[Next](0, numbers.Length)
                passwordString = numbers.ToCharArray()(temp).ToString()
                strrandom += passwordString
            Next
            While opt.IndexOf(passwordString) <> -1
            End While
            lblotp.Text = strrandom
            idotp.Visible = True
        Catch ex As Exception
        End Try
    End Sub 


Build the application and run. To test the working click on generate OTP button.

DEMO:
Generate unique OTP in asp.net using C#, vb.net
 In this article we have learn how to generate unique OTP in asp.net using C# and vb.net . I hope you enjoyed this article.

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