UNiComp.iR

using System;
using System.Windows.Forms;
using System.Runtime.InteropServices;

[StructLayout(LayoutKind.Sequential)]
public struct DEVMODE1 
{
    [MarshalAs(UnmanagedType.ByValTStr,SizeConst=32)] public string dmDeviceName;
    public short  dmSpecVersion;
    public short  dmDriverVersion;
    public short  dmSize;
    public short  dmDriverExtra;
    public int    dmFields;

    public short dmOrientation;
    public short dmPaperSize;
    public short dmPaperLength;
    public short dmPaperWidth;

    public short dmScale;
    public short dmCopies;
    public short dmDefaultSource;
    public short dmPrintQuality;
    public short dmColor;
    public short dmDuplex;
    public short dmYResolution;
    public short dmTTOption;
    public short dmCollate;
    [MarshalAs(UnmanagedType.ByValTStr, SizeConst = 32)] public string dmFormName;
    public short dmLogPixels;
    public short dmBitsPerPel;
    public int   dmPelsWidth;
    public int   dmPelsHeight;

    public int   dmDisplayFlags;
    public int   dmDisplayFrequency;

    public int   dmICMMethod;
    public int   dmICMIntent;
    public int   dmMediaType;
    public int   dmDitherType;
    public int   dmReserved1;
    public int   dmReserved2;

    public int   dmPanningWidth;
    public int   dmPanningHeight;
};



class User_32
{
    [DllImport("user32.dll")]
    public static extern int EnumDisplaySettings (string deviceName, int modeNum, ref DEVMODE1 devMode );         
    [DllImport("user32.dll")]
    public static extern int ChangeDisplaySettings(ref DEVMODE1 devMode, int flags);

    public const int ENUM_CURRENT_SETTINGS = -1;
    public const int CDS_UPDATEREGISTRY = 0x01;
    public const int CDS_TEST = 0x02;
    public const int DISP_CHANGE_SUCCESSFUL = 0;
    public const int DISP_CHANGE_RESTART = 1;
    public const int DISP_CHANGE_FAILED = -1;
}


namespace Resolution
{
    class CResolution
    {
        public CResolution(int a,int b)
        {
            Screen screen = Screen.PrimaryScreen;
            
            
            int iWidth =a;
            int iHeight =b;
            

            DEVMODE1 dm = new DEVMODE1();
            dm.dmDeviceName = new String (new char[32]);
            dm.dmFormName = new String (new char[32]);
            dm.dmSize = (short)Marshal.SizeOf (dm);

            if (0 != User_32.EnumDisplaySettings (null, User_32.ENUM_CURRENT_SETTINGS, ref dm))
            {
                
                dm.dmPelsWidth = iWidth;
                dm.dmPelsHeight = iHeight;

                int iRet = User_32.ChangeDisplaySettings (ref dm, User_32.CDS_TEST);

                if (iRet == User_32.DISP_CHANGE_FAILED)
                {
                    MessageBox.Show("Unable to process your request");
                    MessageBox.Show("Description: Unable To Process Your Request. Sorry For This Inconvenience.","Information",MessageBoxButtons.OK,MessageBoxIcon.Information);
                }
                else
                {
                    iRet = User_32.ChangeDisplaySettings (ref dm, User_32.CDS_UPDATEREGISTRY);

                    switch (iRet) 
                    {
                        case User_32.DISP_CHANGE_SUCCESSFUL:
                        {
                            break;

                            //successfull change
                        }
                        case User_32.DISP_CHANGE_RESTART:
                        {
                            
                            MessageBox.Show("Description: You Need To Reboot For The Change To Happen.\n If You Feel Any Problem After Rebooting Your Machine\nThen Try To Change Resolution In Safe Mode.","Information",MessageBoxButtons.OK,MessageBoxIcon.Information);
                            break;
                            //windows 9x series you have to restart
                        }
                        default:
                        {
                            
                            MessageBox.Show("Description: Failed To Change The Resolution.","Information",MessageBoxButtons.OK,MessageBoxIcon.Information);
                            break;
                            //failed to change
                        }
                    }
                }
                
            }
        }
    }
}

Screen Srn = Screen.PrimaryScreen;
            tempHeight = Srn.Bounds.Width;
            tempWidth = Srn.Bounds.Height;
            Page.ClientScript.RegisterStartupScript(this.GetType(), "Error", "");
            //if you want Automatically Change res.at page load. please uncomment this code.

            if (tempHeight == 600)//if the system is 800*600 Res.then change to 
            {
                FixHeight = 768;
                FixWidth = 1024;
                Resolution.CResolution ChangeRes = new Resolution.CResolution(FixHeight, FixWidth);
            }