Add.xaml

<Grid>
        <TextBlock Margin="20,10,0,0"
                   HorizontalAlignment="Left"
                   VerticalAlignment="Top"
                   FontFamily="Segoe UI"
                   FontSize="32"
                   Text="Add a new Student"
                   TextWrapping="Wrap" />
        <TextBlock Margin="20,80,0,0"
                   HorizontalAlignment="Left"
                   VerticalAlignment="Top"
                   FontFamily="Segoe UI"
                   FontSize="24"
                   Text="Name"
                   TextWrapping="Wrap" />
        <TextBox x:Name="NameBox"
                 Margin="20,130,20,0"
                 HorizontalAlignment="Stretch"
                 VerticalAlignment="Top"
                 TextWrapping="Wrap" />

        <TextBlock Margin="20,200,0,0"
                   HorizontalAlignment="Left"
                   VerticalAlignment="Top"
                   FontFamily="Segoe UI"
                   FontSize="24"
                   Text="Marks"
                   TextWrapping="Wrap" />
        <TextBox x:Name="MarksBox"
                 Margin="20,250,20,0"
                 HorizontalAlignment="Stretch"
                 VerticalAlignment="Top"
                 InputScope="Number"
                 TextWrapping="Wrap" />
        <Button 
                Margin="20,330,20,0"
                HorizontalAlignment="Stretch"
                VerticalAlignment="Top"
                Click="Insert_Button_Click"
                Content="Insert the Record"
                FontSize="24" />

    </Grid>