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Tuesday, 23 December 2014

Login Form By UserType OR User Role In Windows Application In C#.Net , Linq

12/23/2014 - By Pranav Singh 0



This article will show you how you can create a login form power with user type. In this we will use linq qiery to validate the user detail as per there selected role in windows application using c#.net.


So for this article first we will created a windows application and create the login form as shown below.


 Now we will create the class file and add the below code.

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;

namespace WindowsFormsApplication1
{
  public  class DataCollection
    {
      public string UserId { get; set; }
      public string Password { get; set; }
      public string UserType { get; set; }
    }
}

Now add the below code on button click.

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Windows.Forms;

namespace WindowsFormsApplication1
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }


        public List<DataCollection> UserDataCollection()
        {
            List<DataCollection> objDataCollection = new List<DataCollection>();
            objDataCollection.Add(new DataCollection { UserId = "user1", Password = "p1", UserType = "Admin" });
            objDataCollection.Add(new DataCollection { UserId = "user2", Password = "p2", UserType = "Admin" });
            objDataCollection.Add(new DataCollection { UserId = "user3", Password = "p3", UserType = "User" });
            objDataCollection.Add(new DataCollection { UserId = "user4", Password = "p4", UserType = "User" });
            return objDataCollection;
        }

        private void btnclose_Click(object sender, EventArgs e)
        {
            this.Close();
        }

        private void btnlogin_Click(object sender, EventArgs e)
        {
            List<DataCollection> objDataCollection = new List<DataCollection>();
            objDataCollection = UserDataCollection();
            var verifyUser = (from data in objDataCollection
                              where data.UserId == txtUserId.Text &&
                              data.Password == txtPassword.Text &&
                              data.UserType == ddlType.SelectedItem.ToString()
                              select data);
            if (verifyUser.Count() > 0)
            {
                MessageBox.Show("Correct User Id and Password.", "Message", MessageBoxButtons.OK, MessageBoxIcon.None);
            }
            else
            {
                MessageBox.Show("Wrong User Id and Password.", "Message", MessageBoxButtons.OK, MessageBoxIcon.Error);
            }
        }
    }
}

In above code I have created a collection of the user id and password and user type.   Now on button click I have used linq query to validate the detail. Now we have done run the application to check the output.


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