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7.8

How to check if username exits then errorr

Asked by introlux in Visual Studio, Microsoft Access Database, C# Programming Language

Tags: Microsoft, Visual Studio .Net, 2005, C#, Internet Explorer

In alot of cases, I am creating username or project id numbers. I would like to check if project id exists then display error in label.

I have added registration code in my snippet.

Summary Problem:

If username exists, then display error message, user already exists
else add user.

I am using MS Access to store data as it is not a major big project where i need mysql etc...

Thanks,

introlux

View the Solution FREE for 30 Days

         
           
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             =======================================================================
Behind Code (CS)
=======================================================================
 
using System;
using System.Data;
using System.Configuration;
using System.Collections;
using System.Web;
using System.Web.Security;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;
using System.Web.UI.HtmlControls;
using System.Data.OleDb;
using System.Security.Cryptography;
 
public partial class Registration : System.Web.UI.Page
{
    protected void Page_Load(object sender, EventArgs e)
    {
 
    }
    void addUser()
    {
        string sqlCmd;
        sqlCmd = "INSERT INTO Users (Username, Salt, Pass, Email) VALUES (@Username, @Salt, @Pass, @Email)";
        OleDbConnection objConn = new OleDbConnection ("Provider=Microsoft.Jet.OleDb.4.0;Data Source=" + Server.MapPath("Data/ProCom.mdb"));
        OleDbCommand objCmd = new OleDbCommand(sqlCmd, objConn);
        RNGCryptoServiceProvider objRng = new RNGCryptoServiceProvider();
        int intSaltSize = 16;
 
        objCmd.Parameters.Add("@Username", txtUsername.Text);
        byte[] objByte = new byte[intSaltSize];
        objRng.GetBytes(objByte);
        string strSalt = Convert.ToBase64String(objByte);
        objCmd.Parameters.Add("@Salt", strSalt);
        objCmd.Parameters.Add("@Pass", FormsAuthentication.HashPasswordForStoringInConfigFile(strSalt + txtPassword.Text, "SHA1"));
        objCmd.Parameters.Add("@Email", txtEmail.Text);
 
        objConn.Open();
        objCmd.ExecuteNonQuery();
        objConn.Close();
    }
    protected void AddCredentials_Click(object sender, EventArgs e)
    {
        addUser();
        Response.Redirect("default.aspx");
    }
}
 
=====================================================================
ASPX
=====================================================================
<%@ Page Language="C#" AutoEventWireup="true" CodeFile="Registration.aspx.cs" Inherits="Registration" %>
 
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
 
<%@ Import Namespace="System.Data.OleDb" %>
<%@ Import Namespace="System.Web.Security" %>
<%@ Import Namespace="System.Security.Cryptography" %>
 
<html xmlns="http://www.w3.org/1999/xhtml" >
<head>
<title>PCS Registration</title>
<script runat="server" language="C#">
</script>
</head>
<body>
    <a href="javascript:history.back(-1)">Go Back</a><br />
<div style="margin-left:auto; margin-right:auto; width:30%;">
<table cellpadding="5" cellspacing="0" border="0" width="100%">
<tr>
<td>
<form id="Form1" runat="server">
    <h2 style="text-align: center">
        PCS Registration</h2>
    <br />
    <br />
Username:<br /> 
<asp:TextBox id="txtUsername" runat="server" /><br />
Password:<br /> 
<asp:TextBox id="txtPassword" runat="server" TextMode="Password" /><br />
Email:<br /> 
<asp:TextBox id="txtEmail" runat="server" /><br /><br />
<asp:Button id="btnReg" runat="server" Text="Register" onClick="AddCredentials_Click" />
</form>
</td>
</tr>
</table>
</div>
</body>
</html>

           
         

20091111-EE-VQP-92 / EE_QW_2_20070628

How to check if username exits then errorr

Asked by introlux in Visual Studio, Microsoft Access Database, C# Programming Language

Tags: Microsoft, Visual Studio .Net, 2005, C#, Internet Explorer

About this solution