C# TextBox 全選問題

TextBox 全選問

private void textBox1_Enter(object sender, EventArgs e) 
{ 
textBox1.SelectAll(); 
} 
private void textBox1_MouseClick(object sender, EventArgs e) 
{ 
textBox1.SelectAll(); 
} 
private void Form1_Load(object sender, EventArgs e) 
{ 
textBox1 .GotFocus += new EventHandler(textBox1_Enter); 
textBox1.MouseClick +=new MouseEventHandler(textBox1_MouseClick); 
} 

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