Below is a sample code snippet demonstrating how launch the Email and Accounts Settings App via the URI Scheme and LaunchUriAsync method in Windows Phone using C#.
How to Launch the Email and Accounts Settings App using URI Scheme in Windows Phone 8?
// Function open the Email and Accounts Settings App using URI Scheme in Windows Phone 8 using C#.
private async System.Threading.Tasks.Task LaunchEmailandAccounts()
{
await Launcher.LaunchUriAsync(new Uri("ms-settings-emailandaccounts:"));
}