How to generate random username and password in C#? ~ Code Kulshresth

How to generate random username and password in C#?

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...............................source code................

<%@ Page Language="C#" AutoEventWireup="true" CodeFile="randomusername.aspx.cs" Inherits="randomusername" %>

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">

<html xmlns="http://www.w3.org/1999/xhtml">
<head runat="server">
<title></title>
<style type="text/css">
.style1
{
width: 100%;
background-color: #FF9999;
}
.style2
{
width: 79px;
}
.style3
{
width: 115px;
}
</style>
</head>
<body>
<form id="form1" runat="server">
<div>
<asp:Panel ID="Panel1" runat="server">
<table class="style1">
<tr>
<td class="style2">
FirstName</td>
<td>
<asp:TextBox ID="TextBox1" runat="server" Width="150px"></asp:TextBox>
</td>
</tr>
<tr>
<td class="style2">
LastName</td>
<td>
<asp:TextBox ID="TextBox2" runat="server" Width="150px"></asp:TextBox>
</td>
</tr>
<tr>
<td class="style2">
Mobile</td>
<td>
<asp:TextBox ID="TextBox3" runat="server" Width="150px"></asp:TextBox>
</td>
</tr>
<tr>
<td class="style2">
 </td>
<td>
<asp:Button ID="Button1" runat="server" Text="Button" Width="100px"
onclick="Button1_Click" />
</td>
</tr>

</table>
</asp:Panel>
<asp:Panel ID="Panel2" runat="server">
<table>
<tr>
<td class="style3">
Username </td>
<td>
<asp:Label ID="Label1" runat="server" Text="Label"></asp:Label>
</td>
</tr>
<tr>
<td class="style3">
Password</td>
<td>
<asp:Label ID="Label2" runat="server" Text="Label"></asp:Label>
</td>
</tr>
<tr>
<td class="style3">
 </td>
<td>
 </td>
</tr>

<tr>
<td class="style3">
 </td>
<td>
<asp:LinkButton ID="LinkButton1" runat="server" onclick="LinkButton1_Click">Change Password..</asp:LinkButton>
</td>
</tr>
<tr>
<td class="style3">
 </td>
<td>
 </td>
</tr>
</table>
</asp:Panel>

<asp:Panel ID="Panel3" runat="server">
<tr>
<td class="style3">
Old Password</td>
<td>
<asp:TextBox ID="TextBox4" runat="server" Width="150px"></asp:TextBox>
</td>
</tr>
<tr>
<td class="style3">
New Password</td>
<td>
<asp:TextBox ID="TextBox5" runat="server" Width="150px"></asp:TextBox>
</td>
</tr>
<tr>
<td class="style3">
</td>
<td>
<asp:Button ID="Button2" runat="server" Text="Submit" onclick="Button2_Click" /> </td>
</tr>
</asp:Panel>

</div>
<p>
 </p>
<p>
 </p>
</form>
</body>
</html>

.......................end source code....................

......................code behind....................

using System;

using System.Collections.Generic;

using System.Linq;

using System.Web;

using System.Web.UI;

using System.Web.UI.WebControls;

using System.Text;

using System.Data.SqlClient;

using System.IO;

using System.Collections;

using System.Configuration;

using System.Data;

public partial class randomusername : System.Web.UI.Page

{

SqlConnection con = new SqlConnection(ConfigurationManager.ConnectionStrings["constr"].ToString());

SqlCommand cmd;

SqlDataReader dr;

SqlDataAdapter da;

DataSet ds = new DataSet();

protected void Page_Load(object sender, EventArgs e)

{

if (!IsPostBack)

{

if (!IsPostBack)

{

Panel2.Visible = false;

Panel3.Visible = false;

}

protected void Button1_Click(object sender, EventArgs e)

{

insert();

Label1.Text = TextBox1.Text.Trim() + CreateRandomUsername(8);

Label2.Text = CreateRandomPassword(8);

Response.Write("<script>alert('[Your Username and Password is this')</script>");

Panel2.Visible = true;

Panel1.Visible = false;

Panel3.Visible = false;

}

protected void insert()

{

string password = CreateRandomPassword(4);

string fname = TextBox1.Text.Trim();

// ViewState["fname"]=fname;

string lname = TextBox2.Text.Trim();

// ViewState["lname"]=lname;

string str = "insert into random(firstname,lastname,mobile,password) values('" + fname + "','" + lname + "','" + TextBox3.Text + "','" + password + "')";

cmd = new SqlCommand(str,con);

con.Open();

cmd.ExecuteNonQuery();

con.Close();

}

public static string CreateRandomUsername(int UsernameLength)

{

string _allowedChars = "0123456789";

Random randNum = new Random();

char[] chars = new char[UsernameLength];

int allowedCharCount = _allowedChars.Length;

for (int i = 0; i < UsernameLength; i++)

{

chars[i] = _allowedChars[(int)((_allowedChars.Length) * randNum.NextDouble())];

}

return new string(chars);

}

public static string CreateRandomPassword(int PasswordLength)

{

string _allowedChars = "0123456789abcdefghijkmnopqrstuvwxyz";

Random randNum = new Random();

char[] chars = new char[PasswordLength];

int allowedCharCount = _allowedChars.Length;

for (int i = 0; i < PasswordLength; i++)

{

chars[i] = _allowedChars[(int)((_allowedChars.Length) * randNum.NextDouble())];

}

return new string(chars);

}

protected void LinkButton1_Click(object sender, EventArgs e)

{

Panel3.Visible = true;

}

protected void Button2_Click(object sender, EventArgs e)

{

string fname = TextBox1.Text.Trim();

string str = "update random set password='" + TextBox5.Text + "' where firstname='" + fname + "'";

cmd = new SqlCommand(str, con);

con.Open();

cmd.ExecuteNonQuery();

con.Close();

Response.Write("<script>alert('[Your Username and Password is updated..successfully')</script>");

}

....................end code behind...............

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Sunday, 16 December 2012