We will use the persistent settings library we presented earlier to check if we've got persisted credentials from earlier sessions:

string Host = await RuntimeSettings.GetAsync( 
"XmppHost","waher.se"); 
int Port = (int)await RuntimeSettings.GetAsync("XmppPort", 5222); 
string UserName = await RuntimeSettings.GetAsync( 
"XmppUserName",string.Empty); 
string PasswordHash = await RuntimeSettings.GetAsync( 
"XmppPasswordHash", string.Empty); 
string PasswordHashMethod = await RuntimeSettings.GetAsync( 
"XmppPasswordHashMethod", string.Empty);