I Have Created A C# Application And I M Opening A Form In New Thread Problem With This Is Thread Stop Itself And Hence Stopping The Form.

private void button2_Click(object sender, EventArgs e)
        {
            if (openFileDialog1.ShowDialog() == System.Windows.Forms.DialogResult.OK)
            {
                string name = openFileDialog1.FileName;
                FileInfo src = new FileInfo(openFileDialog1.FileName);



                Thread t = new Thread(() => startsending(src));
                // t.IsBackground = true;
                t.Start();

                //  sndfle.RunWorkerAsync(index + ":"+openFileDialog1.FileName);



            }
        }
        private void startsending(FileInfo src)
        {

            fileoperatrionform fm = new fileoperatrionform(cp, src);//this is constructor of fileoperationform and here cp is user defined class;
            

        }