C# Access Database Tutorials In Urdu (Code) - Manage Employee Screen

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Forms;
using System.Configuration;
using System.Data.OleDb;

namespace DatabaseDemoWithAccessVC
{
    public partial class ManageEmployeesForm : Form
    {
        public ManageEmployeesForm()
        {
            InitializeComponent();
        }

        private DataTable dtEmployees = new DataTable();

        private void ManageEmployeesForm_Load(object sender, EventArgs e)
        {
            LoadDataIntoDataGridView();
        }

        private void LoadDataIntoDataGridView()
        {
            EmployeesListDataGridView.DataSource = GetEmployeesList();
        }

        private DataTable GetEmployeesList()
        {
            //DataTable dtEmployees = new DataTable();

            dtEmployees.Rows.Clear();

            string connString = ConfigurationManager.ConnectionStrings["dbx"].ConnectionString;

            using (OleDbConnection con = new OleDbConnection(connString))
            {
                using (OleDbCommand cmd = new OleDbCommand("SELECT * FROM Employees", con))
                {
                    con.Open();

                    OleDbDataReader reader = cmd.ExecuteReader();

                    dtEmployees.Load(reader);
                }
            }

            return dtEmployees;
        }

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

        private void resetFormToolStripMenuItem_Click(object sender, EventArgs e)
        {
            NameTextBox.Clear();
            EmailTextBox.Clear();
            MobileTextBox.Clear();
            PhoneTextBox.Clear();
        }

        private void NameTextBox_TextChanged(object sender, EventArgs e)
        {
            //DataView dvEmployees = dtEmployees.DefaultView;
            //dvEmployees.RowFilter = "Name LIKE '%" + NameTextBox.Text + "%'";
            FilterDataByColumn("Name", NameTextBox);
        }

        private void EmailTextBox_TextChanged(object sender, EventArgs e)
        {
            //DataView dvEmployees = dtEmployees.DefaultView;
            //dvEmployees.RowFilter = "Email LIKE '%" + EmailTextBox.Text + "%'";
            FilterDataByColumn("Email", EmailTextBox);
        }

        private void FilterDataByColumn(string columnName, TextBox txtBox)
        {
            DataView dvEmployees = dtEmployees.DefaultView;
            dvEmployees.RowFilter = columnName + " LIKE '%" + txtBox.Text + "%'";
        }

        private void MobileTextBox_TextChanged(object sender, EventArgs e)
        {
            FilterDataByColumn("Mobile", MobileTextBox);
        }

        private void PhoneTextBox_TextChanged(object sender, EventArgs e)
        {
            FilterDataByColumn("Phone", PhoneTextBox);
        }

        private void addNewEmployeeToolStripMenuItem_Click(object sender, EventArgs e)
        {
            EmployeeInfoForm eif = new EmployeeInfoForm();
            eif.ShowDialog();

            LoadDataIntoDataGridView();
        }
    }
}