C # WinForm textbox add watermark Effect

1. Add the Watermarktextbox class to the new project:

usingSystem;usingSystem.Collections.Generic;usingSystem.Text;usingSystem.Windows.Forms;usingSystem.Drawing;usingSystem.ComponentModel;namespacetextboxwatermark{[ToolboxBitmap (typeof(TextBox))]  Public classWatermarktextbox:textbox {Private string_emptytexttip; PrivateColor _emptytexttipcolor =Color.darkgray; Private Const intWM_PAINT =0xF;  PublicWatermarktextbox ():Base() {} [DefaultValue ("")]         Public stringEmptytexttip {Get{return_emptytexttip;} Set{_emptytexttip=value; Base.            Invalidate (); }} [DefaultValue (typeof(Color),"Darkgray")]         PublicColor Emptytexttipcolor {Get{return_emptytexttipcolor;} Set{_emptytexttipcolor=value; Base.            Invalidate (); }        }        protected Override voidWndProc (refMessage m) {            Base. WndProc (refm); if(M.msg = =wm_paint) {Wmpaint (refm); }        }        Private voidWmpaint (refMessage m) {            using(Graphics graphics = Graphics.fromhwnd (Base. Handle)) {if(Text.length = =0&&!string. IsNullOrEmpty (_emptytexttip)&&!Focused) {textformatflags format=textformatflags.endellipsis|Textformatflags.verticalcenter; if(RightToLeft = =righttoleft.yes) {format|= Textformatflags.righttoleft |Textformatflags.right;                        } textrenderer.drawtext (Graphics, _emptytexttip, Font,Base.                ClientRectangle, _emptytexttipcolor, format); }            }        }    }}

2. Instantiate the control in the form and add:

usingSystem;usingSystem.Collections.Generic;usingSystem.ComponentModel;usingSystem.Data;usingSystem.Drawing;usingSystem.Text;usingSystem.Windows.Forms;namespacetextboxwatermark{ Public Partial classForm1:form { PublicForm1 () {InitializeComponent (); Textboxwatermark.watermarktextbox Tbname=NewWatermarktextbox (); Tbname.emptytexttip="Please enter your account number."; Tbname.location=NewSystem.Drawing.Point ( the, the); Tbname.size=NewSystem.Drawing.Size ( Max, +); Tbname.name="Tbname"; Tbname.tabstop=false; //tbname.tabindex = 0;             This.            Controls.Add (Tbname); Textboxwatermark.watermarktextbox Tbpassword=NewWatermarktextbox (); Tbpassword.emptytexttip="Please enter your password."; Tbpassword.location=NewSystem.Drawing.Point ( the, -); Tbpassword.size=NewSystem.Drawing.Size ( Max, +); Tbpassword.name="Tbpassword"; Tbpassword.tabstop=false; //tbname.tabindex = 0;             This.        Controls.Add (Tbpassword); }    }}

C # WinForm textbox add watermark Effect