Step 3 : The MainPage.xaml file is as in the following code:
Code :
<Page
    x:Class="App1.MainPage"
    IsTabStop="false"
    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
    xmlns:local="using:App1"
    xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
    xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
    mc:Ignorable="d">
 
    <Grid Background="SkyBlue">
        <Grid.ColumnDefinitions>
            <ColumnDefinition Width=".133*"></ColumnDefinition>
            <ColumnDefinition Width=".033*"></ColumnDefinition>
            <ColumnDefinition Width=".333*"></ColumnDefinition>
            <ColumnDefinition Width=".333*"></ColumnDefinition>
        </Grid.ColumnDefinitions>
        <Grid.RowDefinitions>
            <RowDefinition Height=".333*"></RowDefinition>
            <RowDefinition Height=".063*"></RowDefinition>
            <RowDefinition Height=".063*"></RowDefinition>
            <RowDefinition Height=".063*"></RowDefinition>
            <RowDefinition Height=".133*"></RowDefinition>
        </Grid.RowDefinitions>
        <TextBlock Grid.Column="2" Grid.Row="0" Text="Find the Name of Day of any Date" FontSize="30" Foreground="Blue" FontWeight="ExtraBlack" Margin="0,350,0,0" ></TextBlock>
        <TextBlock Grid.Column="0" Grid.Row="1" Text="Select Date:" HorizontalAlignment="Right" FontSize="20" FontWeight="Bold" Foreground="Red"></TextBlock>
        <ComboBox x:Name="dd" Grid.Column="2" Grid.Row="1" BorderThickness="5" BorderBrush="Black" FontWeight="Bold" Background="Yellow" Height="50" Width="300" HorizontalAlignment="Left"  VerticalAlignment="Top">
            <ComboBoxItem>1</ComboBoxItem>
            <ComboBoxItem>2</ComboBoxItem>
            <ComboBoxItem>3</ComboBoxItem>
            <ComboBoxItem>4</ComboBoxItem>
            <ComboBoxItem>5</ComboBoxItem>
            <ComboBoxItem>6</ComboBoxItem>
            <ComboBoxItem>7</ComboBoxItem>
            <ComboBoxItem>8</ComboBoxItem>
            <ComboBoxItem>9</ComboBoxItem>
            <ComboBoxItem>10</ComboBoxItem>
            <ComboBoxItem>11</ComboBoxItem>
            <ComboBoxItem>12</ComboBoxItem>
            <ComboBoxItem>13</ComboBoxItem>
            <ComboBoxItem>14</ComboBoxItem>
            <ComboBoxItem>15</ComboBoxItem>
            <ComboBoxItem>16</ComboBoxItem>
            <ComboBoxItem>17</ComboBoxItem>
            <ComboBoxItem>18</ComboBoxItem>
            <ComboBoxItem>19</ComboBoxItem>
            <ComboBoxItem>20</ComboBoxItem>
            <ComboBoxItem>21</ComboBoxItem>
            <ComboBoxItem>22</ComboBoxItem>
            <ComboBoxItem>23</ComboBoxItem>
            <ComboBoxItem>24</ComboBoxItem>
            <ComboBoxItem>25</ComboBoxItem>
            <ComboBoxItem>26</ComboBoxItem>
            <ComboBoxItem>27</ComboBoxItem>
            <ComboBoxItem>28</ComboBoxItem>
            <ComboBoxItem>29</ComboBoxItem>
            <ComboBoxItem>30</ComboBoxItem>
            <ComboBoxItem>31</ComboBoxItem>
        </ComboBox>
        <TextBlock Grid.Column="0" Grid.Row="2" Text="Select Month:" HorizontalAlignment="Right" FontSize="20" FontWeight="Bold" Foreground="Red"></TextBlock>
        <ComboBox x:Name="mm" Grid.Column="2" Grid.Row="2" BorderThickness="5" BorderBrush="Black" FontWeight="Bold" Background="Yellow" Height="50" Width="300" HorizontalAlignment="Left" VerticalAlignment="Top">
            <ComboBoxItem>Januvary</ComboBoxItem>
            <ComboBoxItem>February</ComboBoxItem>
            <ComboBoxItem>March</ComboBoxItem>
            <ComboBoxItem>April</ComboBoxItem>
            <ComboBoxItem>May</ComboBoxItem>
            <ComboBoxItem>June</ComboBoxItem>
            <ComboBoxItem>July</ComboBoxItem>
            <ComboBoxItem>August</ComboBoxItem>
            <ComboBoxItem>September</ComboBoxItem>
            <ComboBoxItem>October</ComboBoxItem>
            <ComboBoxItem>November</ComboBoxItem>
            <ComboBoxItem>December</ComboBoxItem>
        </ComboBox>
        <TextBlock Grid.Column="0" Grid.Row="3" Text="Select Year:" HorizontalAlignment="Right" FontSize="20" FontWeight="Bold" Foreground="Red"></TextBlock>
        <ComboBox x:Name="yy" Grid.Column="2" Grid.Row="3" BorderThickness="5" BorderBrush="Black" FontWeight="Bold" Background="Yellow" Height="50" Width="300" HorizontalAlignment="Left"  VerticalAlignment="Top">
            <ComboBoxItem>2000</ComboBoxItem>
            <ComboBoxItem>2001</ComboBoxItem>
            <ComboBoxItem>2002</ComboBoxItem>
            <ComboBoxItem>2003</ComboBoxItem>
            <ComboBoxItem>2004</ComboBoxItem>
            <ComboBoxItem>2005</ComboBoxItem>
            <ComboBoxItem>2006</ComboBoxItem>
            <ComboBoxItem>2007</ComboBoxItem>
            <ComboBoxItem>2008</ComboBoxItem>
            <ComboBoxItem>2009</ComboBoxItem>
            <ComboBoxItem>2010</ComboBoxItem>
            <ComboBoxItem>2011</ComboBoxItem>
            <ComboBoxItem>2012</ComboBoxItem>
        </ComboBox>
        <TextBlock x:Name="res" Grid.Column="2" Grid.Row="4" Text="Name of the Day" FontSize="30" Foreground="Red" FontWeight="ExtraBlack" VerticalAlignment="Top" Visibility="Collapsed"></TextBlock>
        <Button Grid.Column="2" Grid.Row="4" VerticalAlignment="Center" Content="Get Day_Name" Background="Red" HorizontalAlignment="Center" Click="Button_Click_1"></Button>
    </Grid>
</Page>