private void btnPermissionHelp_Click(object sender, EventArgs e)
{
UpdateHistory uh = new UpdateHistory("权限说明", "permission.txt");
uh.ShowDialog(this);
}
private void btnUpdateHistory_Click(object sender, EventArgs e)
{
UpdateHistory uh = new UpdateHistory("更新历史记录", "readme.txt");
uh.ShowDialog(this);
}