WPF Data Binding Tutorial 3

I have highlighted some codes in below example that"s needed to be added to implement INotifyPropertyChanged.We already know the INotifyPropertyChanged  implemented in Chapter 2(refer:http://tempuri.org/tempuri.html ).Now we  see XAML  page how to binding use Binding Property in Text below code i  highlighted some codes in below XAML

<Window x:Class="WPF_Tutorial.Dataentry"
        xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
        Title="Dataentry" Height="443" Width="371"
 Background="WhiteSmoke" WindowStartupLocation="CenterScreen" Loaded="Window_Loaded">
    <Grid Height="285" Width="286" x:Name="myGrid">
        <Grid.ColumnDefinitions>
            <ColumnDefinition Width="99*"></ColumnDefinition>
            <ColumnDefinition Width="187*"></ColumnDefinition>
        </Grid.ColumnDefinitions>
        <Grid.RowDefinitions>
            <RowDefinition Height="*"></RowDefinition>
            <RowDefinition Height="*"></RowDefinition>
            <RowDefinition Height="*"></RowDefinition>
            <RowDefinition Height="*"></RowDefinition>
            <RowDefinition Height="*"></RowDefinition>
            <RowDefinition Height="*"></RowDefinition>
            <RowDefinition Height="*"></RowDefinition>
        </Grid.RowDefinitions>
        <TextBlock Margin="54,20,0,0">Rollno::</TextBlock>
        <TextBlock Grid.Row="1" Margin="39,12,0,12">FirstName::</TextBlock>
        <TextBlock Grid.Row="2" Margin="34,9,0,14">LastName::</TextBlock>
        <TextBlock Grid.Row="3" Margin="22,10,185,12" Grid.ColumnSpan="2">CollegeName::</TextBlock>
        <TextBlock Grid.Row="4" Margin="62,10,185,13" Grid.ColumnSpan="2">Mark::</TextBlock>
        <TextBlock Grid.Row="5" Margin="33,10,3,17">ExamResult::</TextBlock>
        <TextBox Grid.Column="1" Name="txtRollNo"  Margin="0,7,40,10" 
Text="{Binding Path=Rollno}" ></TextBox>
        <TextBox Grid.Row="1" Grid.Column="1" Name="txtFirstName" Text="{Binding Path=FirstName}"  Margin="0,7,40,10" ></TextBox>
        <TextBox Grid.Row="2" Grid.Column="1" Name="txtLastName"  Margin="0,7,40,10" 
   Text="{Binding Path=Lastname}" ></TextBox>
        <TextBox Grid.Row="3" Grid.Column="1" Name="txtClgname"  Margin="0,7,40,10"
    Text="{Binding Path=Colleagename}" ></TextBox>
        <TextBox Grid.Row="4" Grid.Column="1" Name="txtMarks"  Margin="0,7,40,10" 
   Text="{Binding Path=Marksobtaine}"></TextBox>
        <TextBox Grid.Row="5" Grid.Column="1" Name="txtexamresult"  Margin="0,7,40,10" 
    Text="{Binding Path=Exam}" ></TextBox>
        <Button Grid.Row="6" Name="btnAdd" Content="Insert" Margin="12,12,14,0" Click="btnAdd_Click"></Button>
        <Button Grid.Row="6" Grid.Column="1" Name="btnLoad" Content="Load" Margin="13,12,102,0" Click="btnLoad_Click"></Button>
        <Button Grid.Row="6" Grid.Column="1" Name="btnUpdate" Content="Update" Margin="91,12,12,0" Click="btnUpdate_Click"></Button>
    </Grid>
</Window>

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Windows;
using System.Windows.Shapes;
using System.ComponentModel;
namespace
WPF_Tutorial
{
   public partial class Dataentry : Window
    {
        Students objStudent = new Students(); //create object for student class 
        publicDataentry()
        {
            InitializeComponent();
        }
        //insert record
        private void btnAdd_Click(object sender, RoutedEventArgs e)
        {
            try
            {
                objStudent.Insetrt();
                MessageBox.Show("Record inserted", "Insert");
                //clearField
                txtRollNo.Text = "";
                txtFirstName.Text = "";
                txtLastName.Text = "";
                txtClgname.Text = "";
                txtexamresult.Text = "";
                txtMarks.Text = "";
            }
            catch(Exception ex)

            {
                MessageBox.Show(ex.Message);
            }
        }
        //load record
        private void btnLoad_Click(objectsender, RoutedEventArgs e)
        {
            if(txtRollNo.Text != null)
            {
                try
                {
           objStudent.Load();               

                }

                catch(Exception ex)
                {

                    MessageBox.Show(ex.Message);
                }
            }
            else
            {
                MessageBox.Show("enter correct code");
            }
        }
        //updaterecord
        private void btnUpdate_Click(objectsender, RoutedEventArgs e)

        {
            if(txtRollNo.Text != null)
            {
                try
                {
              
                    objStudent.update();
                    MessageBox.Show("Update Record", "Update");

                }

                catch(Exception ex)

                {
                    MessageBox.Show(ex.Message);

                }
            }
        }

        private void Window_Loaded(objectsender, RoutedEventArgs e)

        {
            myGrid.DataContext = objStudent; 

        }
    }
}

Conclusion