private bool CheckInput()
{
if (string.IsNullOrEmpty(TxtUserName.Text.Trim()) || string.IsNullOrEmpty(TxtPassword.Text.Trim()) ||
string.CompareOrdinal(TxtUserName.ToString(), TxtUserName.Text.Trim()) == 0 ||
string.CompareOrdinal(TxtPassword.ToString(), TxtPassword.Text.Trim()) == 0)
{
LblErrorMessage.Content = "User name or password error.";
return(false);
}
return(true);
}