C # change the display resolution

C # change the display resolution

The followingCodeTo modify the resolution and refresh frequency of a display: Using system; Using system. drawing; Using system. collections; Using system. componentmodel; Using system. Windows. forms; Using system. Data; Using system. runtime. interopservices;   Namespace screenresolution {   Public class form1: system. Windows. Forms. Form { Public Enum dmdo { Default = 0, D90 = 1, D180 = 2, D270 = 3 }   [Structlayout (layoutkind. Sequential, charset = charset. Auto)] Struct devmode { Public const int dm_displayfrequency = 0x400000; Public const int dm_pelswidth = 0x80000; Public const int dm_pelsheight = 0x100000; Private const int cchdevicename = 32; Private const int cchformname = 32;   [Financialas (unmanagedtype. byvaltstr, sizeconst = cchdevicename)] Public String dmdevicename; Public short dmspecversion; Public short dmdriverversion; Public short dmsize; Public short dmdriverextra; Public int dmfields;   Public int dmpositionx; Public int dmpositiony; Public dmdo dmdisplayorientation; Public int dmdisplayfixedoutput;   Public short dmcolor; Public short dmduplex; Public short dmyresolution; Public short dmttoption; Public short dmcollate; [Financialas (unmanagedtype. byvaltstr, sizeconst = cchformname)] Public String dmformname; Public short dmlogpixels; Public int 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; }   [Dllimport ("user32.dll", charset = charset. Auto)] // Static extern int changedisplaysettings (devmode lpdevmode, int dwflags );   Static extern int changedisplaysettings ([in] ref devmode lpdevmode, int dwflags ); Private system. componentmodel. Container components = NULL; Public form1 () { Initializecomponent (); } Protected override void dispose (bool disposing) { If (disposing) { If (components! = NULL) { Components. Dispose (); } } Base. Dispose (disposing ); }   # Region windows Form Designer generated code Private void initializecomponent () { This. autoscalebasesize = new system. Drawing. Size (6, 14 ); This. clientsize = new system. Drawing. Size (292,273 ); This. Text = "example of changing the screen resolution ";   } # Endregion   Static void main () { Form1 r = new form1 (); R. changeres (); Application. Run (New form1 ()); }   Void changeres () { Form1 T = new form1 (); Long retval = 0; Devmode dm = new devmode (); DM. dmsize = (short) Marshal. sizeof (typeof (devmode )); DM. dmpelswidth = 1024; DM. dmpelsheight = 768; DM. dmdisplayfrequency = 85; DM. dmfields = devmode. dm_pelswidth | devmode. dm_pelsheight | devmode. dm_displayfrequency; Retval = changedisplaysettings (ref DM, 0 ); } } }