public static bool IsValidLocalPartOfWindowsLiveID(string liveID)
{
if (string.IsNullOrEmpty(liveID) || !char.IsLetter(liveID[0]) || liveID[liveID.Length - 1] == '.' || liveID.IndexOf("..") >= 0 || liveID.Length > 63)
{
return(false);
}
foreach (char c in liveID)
{
if (!WindowsLiveIDLocalPartConstraint.IsValidCharForWindowsLiveID(c))
{
return(false);
}
}
return(true);
}
public static string RemoveInvalidPartOfWindowsLiveID(string liveID)
{
StringBuilder stringBuilder = new StringBuilder();
if (!string.IsNullOrEmpty(liveID))
{
foreach (char c in liveID)
{
if (stringBuilder.Length >= 63)
{
break;
}
if (WindowsLiveIDLocalPartConstraint.IsValidCharForWindowsLiveID(c) && (stringBuilder.Length != 0 || char.IsLetter(c)) && (stringBuilder.Length <= 0 || c != '.' || c != stringBuilder[stringBuilder.Length - 1]))
{
stringBuilder.Append(c);
}
}
if (stringBuilder.Length > 0 && stringBuilder[stringBuilder.Length - 1] == '.')
{
stringBuilder.Remove(stringBuilder.Length - 1, 1);
}
}
return(stringBuilder.ToString());
}