移除在Textbox中按下Enter鍵，會出現的嗶嗶聲

private void textBox1_KeyPress(object sender, KeyPressEventArgs e)  
{  
    switch (e.KeyChar )  
    {  
 case '\r':  
     // perform necessary action  
     e.Handled = true;  
       
//do something  
//Run command  
     if (e.KeyCode.Equals(Keys.Enter))  
     {  
     }  
     break;  
   
    }  
}