private void button1_Click(object sender, EventArgs e)
         {
             openFileDialog1.Filter = "All Files|*";
             openFileDialog1.FilterIndex = 1;
             if (openFileDialog1.ShowDialog(this) == DialogResult.OK)
             {
                 textBox1.Text = string.Empty;
                 textBox1.Text = openFileDialog1.FileName;
             }
         }

         private void button2_Click(object sender, EventArgs e)
         {
             label2.Text = "Status: Pumping...";
             var selFile = File.OpenWrite(textBox1.Text);
             var endpoint = selFile.Seek(0, SeekOrigin.End);
             var sizeSel = int.Parse(textBox2.Text);
             decimal byte1 = sizeSel * 1048576;
             while (endpoint < byte1)
             {
                 endpoint++;
                 selFile.WriteByte(0);
             }
             selFile.Close();
             Process proc = new Process();
             proc.StartInfo.FileName = Convert.ToString(selFile);
             MessageBox.Show("Success!");
             label2.Text = "Status: Pumping Complete...";
         }