Hello,

 

I recently search for a method to delete all cookies from the build in .NET WinForms   control.

 

I didn't found any 

working solution for it, nor working example.

It being told to use   but nothing found about it.

 

So, i will write here my solution for 

clearing and deleting all cookies.

My solution using   with the option flag:  , which described as:

A general purpose option that is used to suppress behaviors on a process-wide basis. The lpBuffer parameter of the function must be a pointer to a DWORD containing the specific behavior to suppress. This option cannot be queried with InternetQueryOption.

 

This option flag should be used together with INTERNET_SUPPRESS_COOKIE_PERSIST options, which means:

Suppresses the persistence of cookies, even if the server has specified them as persistent.

So the example code for it will be:

static void Main(){    SuppressWininetBehavior();    Application.EnableVisualStyles();    Application.SetCompatibleTextRenderingDefault(false);    Application.Run(new Form1());}[System.Runtime.InteropServices.DllImport("wininet.dll", CharSet = System.Runtime.InteropServices.CharSet.Auto, SetLastError = true)]public static extern bool InternetSetOption(int hInternet, int dwOption, IntPtr lpBuffer, int dwBufferLength);private static unsafe void SuppressWininetBehavior(){    /* SOURCE: http://msdn.microsoft.com/en-us/library/windows/desktop/aa385328%28v=vs.85%29.aspx        * INTERNET_OPTION_SUPPRESS_BEHAVIOR (81):        *      A general purpose option that is used to suppress behaviors on a process-wide basis.         *      The lpBuffer parameter of the function must be a pointer to a DWORD containing the specific behavior to suppress.         *      This option cannot be queried with InternetQueryOption.         *              * INTERNET_SUPPRESS_COOKIE_PERSIST (3):        *      Suppresses the persistence of cookies, even if the server has specified them as persistent.        *      Version:  Requires Internet Explorer 8.0 or later.        */    int option = (int)3/* INTERNET_SUPPRESS_COOKIE_PERSIST*/;    int* optionPtr = &option;    bool success = InternetSetOption(0, 81/*INTERNET_OPTION_SUPPRESS_BEHAVIOR*/, new IntPtr(optionPtr), sizeof(int));    if (!success)    {        MessageBox.Show("Something went wrong !>?");    }}

Please make sure your project is allows unsafe code. (under Properties => Build Tab) 

This code is deleting the COOKIES per PROCESS on startup ONLY. 

[tested on WIN-7 and working great]

 

 

http://mdb-blog.blogspot.com/2013/02/c-winforms-webbrowser-clear-all-cookies.html?showComment=1400640795248#c48436006945190670