Sendkeys to catia not working when the ASP.NET application is hosted on IIS

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C#4.0

I have an application developed in asp.net. Here i am trying to send data from my application to Catia application (server machine). Its was working fine in visual studio development server, but getting access was not sucessed while running from hosted application on IIS (server machine). Below is my code:

[System.Runtime.InteropServices.DllImport("user32.dll", EntryPoint = "FindWindowA", ExactSpelling = true, CharSet = System.Runtime.InteropServices.CharSet.Ansi, SetLastError = true)]



        public static extern long FindWindow(StringBuilder lpClassName, StringBuilder lpWindowName);
        F_hwnd = 0; //Reset Form Handler 
            r_count = 0; //Reset retry count

            if (myCommand == "STL Import") //because the window name is Import
            {
                myCommand = "Import";
            }

    StringBuilder mc = new StringBuilder(myCommand);
    catiaCore.GetSetCatia.StartCommand(myCommand);


            //Searching for Import window 
    while (!(F_hwnd != 0 || (r_count == Retry_fail)))
            {
                F_hwnd = FindWindow(null, mc);//get Import window handler – If Import window is found F_hwnd!=0

        catiaCore.GetSetCatia.ActiveWindow.ActiveViewer.Update();//!
                r_count = r_count + 1;
            }

What I have tried:

I have tried to add Network service, IUSER and IISIUSERS full access rights to Windows/System32 folder where is User32.dll file located, but many errors were appeared. Finally, these users somehow appear as like they have full access rights. I also add full access rights to folder where Catia was installed and enabled 32-bit Application in my Application Pool settings. I also tried to enable 32-bit applications in my Application Pool settings and to define Application Pool Identity, but without results.