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private void button1_Click(object sender, EventArgs e)
{
button1.Enabled = false;
Thread TD = new Thread(showwaitfrm);
TD.Start();
Thread.Sleep(1000);
dataGridView1.DataSource = getdate();
TD.Abort();
TD.Join();
while(TD.ThreadState != System.Threading.ThreadState.Stopped) Application.DoEvents();
button1.Enabled = true;
}