Remove ASP. NET page viewstate non-storage Hard Disk Method

Using system;
Using system. IO;
Using system. text;
Using system. Web;
Using system. Web. UI;

Public class clviewstatemng
{
Private losformatter _ formatter = NULL;
Private byte _ viewstate_num_pages;
Private enumsavetype _ viewstate_save_type;
Private httpcontext ohttpcontext = NULL;
Private Static clviewstatemng ovs = NULL;
Public String viewstate_field_name;
Private const string viewstate_page_count = "_ lngviewstate ";
Private const string viewstate_session_obj = "_ objviewstate ";
Private string [] viewstates;

Private string getviewstate (long lreqno)
{
If (this. _ viewstate_num_pages <1)
{
Return NULL;
}
Short Index = (short) (lreqno % (long) This. _ viewstate_num_pages ));
If (this. ohttpcontext. session ["_ objviewstate"] = NULL)
{
Return NULL;
}
This. viewstates = (string []) This. ohttpcontext. session ["_ objviewstate"];
String STR = NULL;
String str2 = lreqno. tostring ();
If (str2 = This. viewstates [Index]. substring (0, str2.length ))
{
STR = This. viewstates [Index]. substring (str2.length );
}
Return STR;
}

Public static clviewstatemng getviewstatemng ()
{
If (ovs = NULL)
{
Ovs = new clviewstatemng ();
Ovs. _ viewstate_save_type = enumsavetype. Session;
Ovs. viewstate_field_name = "_ viewstate_key ";
Ovs. _ viewstate_num_pages = convert. tobyte (5 );
}
Ovs. ohttpcontext = httpcontext. Current;
Return ovs;
}

Public object loadviewstate ()
{
String input = NULL;
If (this. _ formatter = NULL)
{
This. _ formatter = new losformatter ();
}
Input = This. getviewstate (this. requestnumber );

If (input! = NULL)
{
Return this. _ formatter. deserialize (input );
}
Return NULL;
}

Public void saveviewstate (Object viewstate, ref long reqnumber)
{

If (this. _ formatter = NULL)
{
This. _ formatter = new losformatter ();
}
Stringbuilder sb = new stringbuilder ();
Stringwriter output = new stringwriter (SB );
This. _ formatter. serialize (output, viewstate );
Reqnumber = This. setviewstate (sb. tostring ());

}

Private long setviewstate (string szviewstate)
{
If (this. _ viewstate_num_pages <1)
{
Return 0l;
}
This. ohttpcontext. session ["_ lngviewstate"] = (this. ohttpcontext. session ["_ lngviewstate"] = NULL )? 0l: (long) This. ohttpcontext. session ["_ lngviewstate"]) + 1l );
Long num = (long) This. ohttpcontext. session ["_ lngviewstate"];
Short Index = (short) (Num % (long) This. _ viewstate_num_pages ));
If (this. ohttpcontext. session ["_ objviewstate"] = NULL)
{
This. viewstates = new string [This. _ viewstate_num_pages];
This. ohttpcontext. session ["_ objviewstate"] = This. viewstates;
}
Else
{
This. viewstates = (string []) This. ohttpcontext. session ["_ objviewstate"];
}
This. viewstates [Index] = num. tostring () + szviewstate;
Return num;
}

Private long requestnumber
{
Get
{
Long num = 0l;

If (this. ohttpcontext. Request. Form [This. viewstate_field_name]! = NULL)
{
Num = convert. toint64 (this. ohttpcontext. Request. Form [This. viewstate_field_name]);
}

Return num;
}
}

Public enumsavetype savetype
{
Get
{
Return this. _ viewstate_save_type;
}
}

Public Enum enumsavetype
{
Page,
Session
}
}

Usage:
Protected override object loadpagestatefrompersistencemedium ()
{

Clviewstatemng viewstatemng = clviewstatemng. getviewstatemng ();
Return viewstatemng. loadviewstate ();
}

Protected override void savepagestatetopersistencemedium (Object viewstate)
{

Clviewstatemng viewstatemng = clviewstatemng. getviewstatemng ();

Long num = 0;
Viewstatemng. saveviewstate (viewstate, ref num );
This. registerhiddenfield (viewstatemng. viewstate_field_name, num. tostring ());

}
Method 1:
Step 1: Set enableviewstate = "false" in the pages configuration node of the web. config file, or set the header of each ASPX page. After completing step 1. net also outputs content such as <input type = "hidden" name = "_ viewstate" id = "_ viewstate" value = ""/> on the page.
Step 2: delete the runat = "server" attribute in