Solved

Creating a c# login form using ado

Posted on 2009-04-08
6
437 Views
Last Modified: 2013-12-17
Hi

im pretty new to C#.net and want to create a login form using an ADO connection to check password in a SQl db and if the pasword is correect then load up the frmMain. I have created the form with 2 controls (txtUserName and txtPassword) and 2 fields called UserName and Password in table SystemUsers, established connection to my SQL db but im stuck on the bit that goes away and checks the table, any help would be appreciated!!
i have uploaded the code i have done so far
using System;

using System.Collections.Generic;

using System.ComponentModel;

using System.Data;

using System.Data.SqlClient;

using System.Drawing;

using System.Linq;

using System.Text;

using System.Windows.Forms;
 

namespace ClientDetailsApplication1

{

    public partial class frmLogin : Form

    {

        public frmLogin()

        {

            InitializeComponent();

        }     

       

            

        private void btnEnter_Click(object sender, EventArgs e)

        {

            System.Data.SqlClient.SqlConnection conn = new      System.Data.SqlClient.SqlConnection();

            conn.ConnectionString = "integrated security=SSPI;data source=<sqlInstanceName;" +

            "persist security info=False;initial catalog=<database>";

            try

            {

             //if succesful login then open connection and display Main form

                conn.Open();  

                frmMain frmMainDialog = new frmMain();

                frmMainDialog.Show();          

            }

            catch

            {

                MessageBox.Show("Incorrect User name or Password");

            }

            

        }                                                            

                    

                   

       }

}

Open in new window

0
Comment
Question by:wilko100
  • 2
  • 2
  • 2
6 Comments
 
LVL 15

Expert Comment

by:spprivate
ID: 24102216
Create this storedprocedure and pass the parameters from your form.
Get the out put flag check for it in the if condition and act accordingly.
Create Procedure CheckValid

@UserName varchar,

@Password varchar,

@returnflag varchar output

as
 
 
 

select *  from UserLogin where username=@Username and pwd=@Password
 
 

if @@rowcount>=1

Begin

     set @returnflag='T'

     

end
 

else
 

Begin

      set @returnflag='F'

end      

Open in new window

0
 
LVL 14

Expert Comment

by:jjardine
ID: 24102229
You need to create a command and execute a reader or some other method to compare the data.   You could do it like this replace your conn.Open call with this code:

using (SqlCommand cmd = new SqlCommand())
{
     cmd.Connection = conn;
     cmd.CommandText = "SELECT UserName FROM SystemUsers WHERE UserName = @UserName AND Password = @Password");
     cmd.Paramaters.AddWithValue("@UserName",txtUserName.Text);
     cmd.Parameters.AddWithValue("@Password",txtPassword.Text);

     cmd.Connection.Open();

     SqlDataReader reader = cmd.ExecuteReader();

     if(reader.HasRows)  // The user must exist and is logged in
         log in
     else                          //  No matching records.. user doesn't exist
         show error message

    cmd.Connection.Close();
}
0
 
LVL 15

Expert Comment

by:spprivate
ID: 24102243
0
6 Surprising Benefits of Threat Intelligence

All sorts of threat intelligence is available on the web. Intelligence you can learn from, and use to anticipate and prepare for future attacks.

 

Author Comment

by:wilko100
ID: 24102552
when i apply jjardine fix i get this error..

Error      1      'System.Data.SqlClient.SqlCommand' does not contain a definition for 'Paramaters' and no extension method 'Paramaters' accepting a first argument of type 'System.Data.SqlClient.SqlCommand' could be found (are you missing a using directive or an assembly reference?)      

complaining about cmd.Paramaters is that anything to do with  a particular 'namespace' missing?


0
 
LVL 14

Accepted Solution

by:
jjardine earned 500 total points
ID: 24102625
Sorry.. I think there is a mispelling..   should be cmd.Parameters   not paramaters    
0
 

Author Comment

by:wilko100
ID: 24102667
yes just realised! lol, works now, excellent, cheers for that
0

Featured Post

Free Trending Threat Insights Every Day

Enhance your security with threat intelligence from the web. Get trending threat insights on hackers, exploits, and suspicious IP addresses delivered to your inbox with our free Cyber Daily.

Join & Write a Comment

Entity Framework is a powerful tool to help you interact with the DataBase but still doesn't help much when we have a Stored Procedure that returns more than one resultset. The solution takes some of out-of-the-box thinking; read on!
Calculating holidays and working days is a function that is often needed yet it is not one found within the Framework. This article presents one approach to building a working-day calculator for use in .NET.
When you create an app prototype with Adobe XD, you can insert system screens -- sharing or Control Center, for example -- with just a few clicks. This video shows you how. You can take the full course on Experts Exchange at http://bit.ly/XDcourse.
This video explains how to create simple products associated to Magento configurable product and offers fast way of their generation with Store Manager for Magento tool.

743 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question

Need Help in Real-Time?

Connect with top rated Experts

11 Experts available now in Live!

Get 1:1 Help Now