button btn=（button）sender是什么意思啊

button btn=（button）sender是什么意思啊 private void button11_Click(object sender,EventArgs e){Button btn = (Button)sender;textBox1.Text = textBox1.Text + + btn.Text + ;}private void button12_Click(object sender,EventArgs e){Button btn = (Button)sender;textBox1.Text = textBox1.Text button btn = (Button)sender;这句话的意思请解释谢谢! “hot button button是什么意思 button是什么意思 button是什么意思 button button文本大概意思 what's that button for?(保持意思不变) what's the▁ ▁ that button?what can you▁ ▁that button? button head cap percy button是什么意思 Push The Button 歌词 button什么意思 military button是什么意思 bashed antique button Press Calculate Button menu button是什么意思