c# Generics for single form instances

using System;

using System.Collections.Generic;

using System.Text;

using System.Windows.Forms;

namespace WindowsApplication2

{

    class Class1<T> where T : Form, new()

    {

        private static T mInst;

        public Class1()

        {

            // Here i am just stuffing our single form instance code

            //  into the class constructor

            if (mInst == null)

            {

                mInst = new T();

                mInst.Show();

            }

            else

            {

                mInst.WindowState = FormWindowState.Normal;

                mInst.Focus();

            }

        }

        // You need this method for when a form closes

        public void letGo()

        {

            mInst = null;

        }

    }

}

http://www.techpowerup.com/forums/threads/sample-c-code-fun-with-generics-for-single-form-instances.34742/

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private class open_form<T> where T: Form, new()
        {
            private static T _form = null;

            public open_form(Form main_form)
            {
                if(_form == null || _form.IsDisposed)
                {
                    _form = new T();

                    _form.MdiParent = main_form;
                    _form.Show();

                    _form.Location = new Point(0, 0);
                }
            }
        }


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open_form<Well_Production> new_form = new open_form<Well_Production>(this);