Adding additional string to {x:Bind} in XAML Universal Windows Platform

I am new to XAML. I would like to add additional string to x:bind

I have tried

<AppBarToggleButton Icon="Phone" Label="E-Mail To {x:Bind  e_mail}" />
<AppBarToggleButton Icon="Phone" Label="{"E-Mail To" + x:Bind  e_mail}" />

I would like to get "E-Mail to email@email.com"

But no success. Thanks for help.

Create a converter for this:

public sealed class StringFormatConverter : IValueConverter
{
    public object Convert(object value, Type targetType, object parameter, string language)
    {
        if (value == null)
            return null;

        if (parameter == null)
            return value;

        return string.Format(parameter.ToString(), value);
    }

    public object ConvertBack(object value, Type targetType, object parameter, 
        string language)
    {
        throw new NotImplementedException();
    }
}

Add this to yor page/control/app resources:

<converters:StringFormatConverter x:Key="StringFormatConverter" />

And then use it like this:

<TextBlock Text="{x:Bind e_mail}" 
    Converter="{StaticResource StringFormatConverter}" 
    ConverterParameter="E-Mail To {0}!" />