Rhea has designeed an app that should convet the temperature specified in Celsius to the corresponding temperature in Fahrenheit and vice versa. The interface of the app is shown in the following figure.

3. Rhea has designeed an app that should convet the temperature specified in Celsius to the
   corresponding temperature in Fahrenheit and vice versa. The interface of the app is shown in the
   following figure.


Ans:= (XAML Code)
 
       <Viewbox>
         <Grid Background="{StaticResource ApplicationPageBackgroundThemeBrush}" Height="900" Width="1600">
         <TextBlock Text="Celsius" FontSize="100" margin="122,122,1002,668"></Textbox>
         <TextBox X:Name="txtDegreeCelsius" FontSize="70" Margin="122,257,121,654" KeyUp="tetDegreeCelsius_KeyUp"></TextBox>
         <TextBlock Text="Fahreenheit" FontSize="100" margin="122,463,931,326"/>
         <TextBox X:Name="txtDegreeFahreenheit" FontSize="70" Margin="122,257,121,209"KeyUp="tetDegreeFahrenheit_KeyUp"/>
     </Grid>

     
(CCS Code)

       Privete void txtDegreeCelsius_KeyUp(object sender, KeyRoutedEventArgs e)
        {
            try
             {
                 if (!string.IsNullOrEmpty(txtDegreeCelsius.Text.Trim()))
                     txtDegreeFahreheit.Text = (Convert.Todouble(txtDegreeCelsius.Text.Trim()))
                 else
                     txtDegreeFahrenheit.Text = "";
             }
             catch (Exception ex)
             {
                  txtDegreeFahrenheit.Text = "Invalid input";
             }
        }
     
     
       Privete void txtDegreeCelsius_KeyUp(object sender, KeyRoutedEventArgs e)
        {
            try
             {
                 if (!string.IsNullOrEmpty(txtDegreeCelsius.Text.Trim()))
                     txtDegreeFahreheit.Text = (Convert.Todouble(txtDegreeCelsius.Text.Trim()))
                 else
                     txtDegreeFahrenheit.Text = "";
             }
             catch (Exception ex)
             {
                  txtDegreeFahrenheit.Text = "Invalid input";
             }
        }