private void button1_Click(object sender, EventArgs e)
{
bool isValid = !string.IsNullOrEmpty(txtUsername.Text.Trim()) && !string.IsNullOrEmpty(txtNew.Text.Trim()) && !string.IsNullOrEmpty(txtOld.Text.Trim());
string message;
if (!isValid)
{
message = "One or more field haven't been filled correctly";
}
else
{
var result = libraryApp.ChangePassword(txtUsername.Text.Trim(), txtOld.Text.Trim(), txtNew.Text.Trim());
message = result ? "Changed Success" : "Username and Password Not found";
}
MessageBox.Show(message);
}
