C#

ppdialog.Width = Screen.PrimaryScreen.WorkingArea.Width;
ppdialog.Height = Screen.PrimaryScreen.WorkingArea.Height;

using System;
using System.Collections.Generic;
using System.Drawing;
using System.Text;
using System.Windows.Forms;
using System.Diagnostics;
using System.Runtime.InteropServices;
namespace show_exe
{
    public partial class form2 : Form
    {
        #region Methods/Consts for Embedding a Window
        [DllImport("user32.dll", EntryPoint = "GetWindowThreadProcessId", SetLastError = true,
             CharSet = CharSet.Unicode, ExactSpelling = true,
             CallingConvention = CallingConvention.StdCall)]
        private static extern long GetWindowThreadProcessId(long hWnd, long lpdwProcessId);

        [DllImport("user32.dll", SetLastError = true)]
        private static extern IntPtr FindWindow(string lpClassName, string lpWindowName);

        [DllImport("user32.dll", SetLastError = true)]
        private static extern long SetParent(IntPtr hWndChild, IntPtr hWndNewParent);

        [DllImport("user32.dll", EntryPoint = "GetWindowLongA", SetLastError = true)]
        private static extern long GetWindowLong(IntPtr hwnd, int nIndex);

        [DllImport("user32.dll")]
        static extern int SetWindowLong(IntPtr hWnd, int nIndex, int dwNewLong);

        [DllImport("user32.dll", SetLastError = true)]
        private static extern long SetWindowPos(IntPtr hwnd, long hWndInsertAfter, long x, long y, long cx, long cy, long wFlags);

        [DllImport("user32.dll", SetLastError = true)]
        private static extern bool MoveWindow(IntPtr hwnd, int x, int y, int cx, int cy, bool repaint);

        [DllImport("user32.dll", EntryPoint = "PostMessageA", SetLastError = true)]
        private static extern bool PostMessage(IntPtr hwnd, uint Msg, int wParam, int lParam);

        [DllImport("user32.dll")]
        [return: MarshalAs(UnmanagedType.Bool)]
        static extern bool ShowWindow(IntPtr hWnd, ShowWindowCommands nCmdShow);

        [DllImport("user32.dll", EntryPoint = "SetWindowPos")]
        public static extern IntPtr SetWindowPos(IntPtr hWnd, int hWndInsertAfter, int x, int Y, int cx, int cy, int wFlags);


       public enum ShowWindowCommands
        {
               Hide = 0,
        Show = 5,
        Minimize = 6,
        Restore = 9
        }


        private const int SWP_NOOWNERZORDER = 0x200;
        private const int SWP_NOREDRAW = 0x8;
        private const int SWP_NOZORDER = 0x4;
        private const int SWP_SHOWWINDOW = 0x0040;
        private const int WS_EX_MDICHILD = 0x40;
        private const int SWP_FRAMECHANGED = 0x20;
        private const int SWP_NOACTIVATE = 0x10;
        private const int SWP_ASYNCWINDOWPOS = 0x4000;
        private const int SWP_NOMOVE = 0x2;
        private const int SWP_NOSIZE = 0x1;
        private const int GWL_STYLE = (-16);
        private const int WS_VISIBLE = 0x10000000;
        private const int WM_CLOSE = 0x10;
        private const int WS_CHILD = 0x40000000;
        private const int WS_MAXIMIZE = 0x01000000;
        #endregion
        #region Variables
        private IntPtr gpsHandle;
        private Process gpsProcess = null;
        private ProcessStartInfo gpsPSI = new ProcessStartInfo();
        #endregion
        private void SetupGPSPanel()
        {
            //Panel to Contain Controls
         //this.gpsPanel = new Panel();
        this.gpsPanel.Location = new Point(120, 50);
          this.gpsPanel.Size = new Size(this.Size.Width-200 , this.Size.Height-200 );
       //     this.gpsPanel.Visible = true;

            gpsPSI.FileName = "notepad.exe";//DVBViewerTE.exe";//"C:\Program Files\Adobe\Adobe Photoshop CS5\Photoshop.exe";
          //  gpsPSI.Arguments = "";
          //  gpsPSI.WindowStyle = ProcessWindowStyle.Maximized;
            gpsProcess = System.Diagnostics.Process.Start(gpsPSI);
            gpsProcess.WaitForInputIdle();
            gpsHandle = gpsProcess.MainWindowHandle;
            SetParent(gpsHandle, this.gpsPanel.Handle);
          SetWindowLong(gpsHandle, GWL_STYLE, WS_VISIBLE + WS_MAXIMIZE);
          MoveWindow(gpsHandle, this.gpsPanel.Location.X,this.gpsPanel.Location.Y, this.gpsPanel.Width, this.gpsPanel.Height, true);
          
            ShowWindow(gpsHandle, ShowWindowCommands.Show);

            SetWindowPos(gpsHandle, 0, 0, 0, this.gpsPanel.Bounds.Width, this.gpsPanel.Bounds.Height, SWP_NOZORDER | SWP_SHOWWINDOW);
            
            //this.Controls.Add(gpsPanel);

        }
        public form2()
        {
            InitializeComponent();

        }

        private void form2_Load(object sender, EventArgs e)
        {
            SetupGPSPanel();
        }

    }
}

lblStartTime.Text = Convert.ToDateTime(sql_reader["start_time"]).ToString("HH:mm");

Unable to cast object of type 'System.TimeSpan' to type 'System.IConvertible'.