Typically when you press the Enter key while typing in a TextBox control, you will hear the computer beep.

To prevent this beep, handle the Enter key in the KeyPress event, and set the Handled property to true. For example:



      void TextBox_KeyPress( object sender, KeyPressEventArgs e )
      {
          switch (e.KeyChar)
          {
              case '\r':
                  // perform necessary action
                  e.Handled = true;
                  break;
          }
      }