C#

<?xml version="1.0" encoding="utf-8" ?>
<configuration>
    <configSections>
        <sectionGroup name="applicationSettings" type="System.Configuration.ApplicationSettingsGroup, System, Version=2.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089" >
            <section name="MyDll.Properties.Settings" type="System.Configuration.ClientSettingsSection, System, Version=2.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089" requirePermission="false" />
        </sectionGroup>
    </configSections>
    <system.serviceModel>
        <bindings />
        <client />
    </system.serviceModel>
    <applicationSettings>
        <MyDll.Properties.Settings>
            <setting name="MyDll_MyServices_DataService"
                serializeAs="String">
                <value>http://localhost/MyServices/DataService.asmx</value>
            </setting>
        </MyDll.Properties.Settings>
    </applicationSettings>
</configuration>

// Text box code
public class SampleTextBox : TextBox
    {
        public SampleTextBox()
        {
            BorderStyle = BorderStyle.FixedSingle;
        }

        protected override void WndProc(ref Message m)
        {
            switch (m.Msg)
            {
                case 0x000F: // WM_PAINT
                    base.WndProc(ref m);
                        
                    Control control = Control.FromHandle(Handle);
                    Graphics g = Graphics.FromHwnd(Handle);

                    ControlPaint.DrawBorder(g, control.ClientRectangle, Color.YellowGreen, ButtonBorderStyle.Solid);
                  
                    g.Dispose();
                    break;                
                default:
                    base.WndProc(ref m);
                    break;
            }
        }
    }

// Form code

public class SampleForm : Form
    {
        public SampleForm()
        {
            BackColor = Color.SteelBlue;
        }

        protected override CreateParams CreateParams
        {
            get
            {
                CreateParams cp = base.CreateParams;
                cp.ExStyle |= 0x02000000; /*WS_EX_COMPOSITED*/
                return cp;
            }
        }
    }


public class Form2 : SampleForm
    {
        private SampleTextBox textbox1;

        public Form2()
        {

            textbox1 = new SampleTextBox();
            textbox1.Location = new Point(50, 50);

            this.Controls.Add(textbox1);

        }
    }