private void tsbtnUser_Click(object sender, EventArgs e)
{
if (this.MdiChildren.Length == 0)
{
DataBackup back = new DataBackup();
back.MdiParent = this;
back.Show();
}
}
private void 数据备份ToolStripMenuItem_Click(object sender, EventArgs e)
{
if (this.MdiChildren.Length == 0)
{
DataBackup backup = new DataBackup();
backup.MdiParent = this;
backup.Show();
}
}