private async void Savebtn_Clicked(object sender, EventArgs e)
{
string auth = await _firebaseAuth.GetCurrentUser();
if (auth != null)
{
string name = username.Text.Trim();
_firebaseDatabase.UpdateUserName(auth, name);
}
username.IsEnabled = false;
userimage.IsEnabled = false;
editbtn.IsVisible = true;
savebtn.IsVisible = false;
}