C#

"C:\Program Files\Microsoft SQL Server\MSSQL.1\MSSQL\Data\Coupon Management.mdf"

connectionString="Data Source=.\SQLEXPRESS;AttachDbFilename=|DataDirectory|\Coupon Management.mdf;Database=Coupon Management;

Trusted_Connection=Yes;Persist Security Info=True;Integrated Security=False

namespace WindowsFormsApplication1
{
    [Guid("c5bdd8d0-d26e-11ce-a89d-00aa006cadc5")]
    [InterfaceType(ComInterfaceType.InterfaceIsIUnknown)]
    public interface ITextHost
    {
        IntPtr TxGetDC();
        IntPtr TxReleaseDC(IntPtr hdc);
    }

    public partial class Form1 : Form, ITextHost
    {
        [DllImport("riched20.dll")]
        private static extern int CreateTextServices(
          [MarshalAs(UnmanagedType.IUnknown)] object punkOuter,
          ITextHost pITextHost,
          [MarshalAs(UnmanagedType.IUnknown), Out] out object ppUnk);

        public Form1()
        {
            InitializeComponent();
            this.Load += new EventHandler(Form1_Load);
        }

        void Form1_Load(object sender, EventArgs e)
        {
            object ppUnk = null;
            int result = CreateTextServices(null, this, out ppUnk);
        }

        #region ITextHost Members

        public IntPtr TxGetDC()
        {
            return this.Handle;
        }

        public IntPtr TxReleaseDC(IntPtr hdc)
        {
            return IntPtr.Zero;
        }
    }
}