using System; using System.Collections.Generic; using System.ComponentModel; using System.Diagnostics; using System.Drawing; using System.Linq; using System.Runtime.InteropServices; using System.Text; using System.Threading.Tasks; using System.Windows.Forms; namespace Customize.Controls { public class TransTextBox : RichTextBox { [DllImport("kernel32.dll", CharSet = CharSet.Auto)] static extern IntPtr LoadLibrary(string lpFileName); protected override CreateParams CreateParams { get { CreateParams prams = base.CreateParams; if (LoadLibrary("msftedit.dll") != IntPtr.Zero) { prams.ExStyle |= 0x020; // transparent prams.ClassName = "RICHEDIT50W";// TRANSTEXTBOXW } return prams; } } } }