C# add text in a certin place in file

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C#

ok i have created code to search though a file but i want to add text in a function in a game script file this is the code i have done.

public void insidemain()
{
    // this is for all functions inside of main and there are a few so we start here
    string[] lines = null;
    try
    {

        lines = File.ReadAllLines(elfenliedprogsettings.Read("Mod") + @"\scripts\zm\" + elfenliedprogsettings.Read("ModName") + ".csc");

    }
    catch (Exception ex)
    {
        XtraMessageBox.Show(ex.Message, "ERROR adding values to mapname.csc ERROR CODE 002");
    }

    if (lines != null)
    {


        using (StreamReader elfenlied = new StreamReader((elfenliedprogsettings.Read("Mod") + @"\scripts\zm\" + elfenliedprogsettings.Read("ModName") + ".csc")))
        {
            string elfenliedtopfan5_program = elfenlied.ReadToEnd();
            if (elfenliedtopfan5_program.Contains("#precache( \"client_fx\", SNOW_FX );"))
            {
                //MessageBox.Show("SCAR-H ALREADY ADDED.");
                _MessageResult.Instance.Append("Already Added :  devine calls to : " + elfenliedprogsettings.Read("Mod") + @"\scripts\zm\" + elfenliedprogsettings.Read("ModName") + ".csc" + Environment.NewLine);
            }
            if (!elfenliedtopfan5_program.Contains("#precache( \"client_fx\", SNOW_FX );"))
            {
                elfenlied.Dispose();
                if (File.Exists(elfenliedprogsettings.Read("Mod") + @"\scripts\zm\" + elfenliedprogsettings.Read("ModName") + ".csc"))
                {
                    {


                        string s =
                                   "#define SNOW_FX \"dlc0/factory/fx_snow_player_os_factory\"\r\n"
                                  + "#precache( \"client_fx\", SNOW_FX );\r\n";


                        string file = elfenliedprogsettings.Read("Mod") + @"\scripts\zm\" + elfenliedprogsettings.Read("ModName") + ".csc";
                        List<string> elf = new List<string>(System.IO.File.ReadAllLines(file));
                        int index = elf.FindIndex(item => item.Contains("function main()" + "{"));
                        if (index != -1)
                        {
                            elf.Insert(index + 1, s);//""
                        }
                        System.IO.File.WriteAllLines(file, elf);
                        //richTextBoxEx1.LoadFile(Properties.Settings.Default.mods + "//mod.csv", RichTextBoxStreamType.PlainText);
                        //MessageBox.Show("Added: " + s + " Mods.csv");
                        _MessageResult.Instance.Append("\r\nAdded:  " + s + elfenliedprogsettings.Read("Mod") + @"\scripts\zm\" + elfenliedprogsettings.Read("ModName") + ".csc" + Environment.NewLine);

                    }
                }
            }

        }
    }

}

but the part im having issues with i can not get the text to go inside the brackets i need the text to be placed inside the mainfunction

but i i not sure how to accumplish this.

the file

#using scripts\codescripts\struct;
#using scripts\shared\audio_shared;
#using scripts\shared\callbacks_shared;
#using scripts\shared\clientfield_shared;
#using scripts\shared\exploder_shared;
#using scripts\shared\scene_shared;
#using scripts\shared\util_shared;

#insert scripts\shared\shared.gsh;
#insert scripts\shared\version.gsh;

#using scripts\zm\_load;
#using scripts\zm\_zm_weapons;

//Perks
#using scripts\zm\_zm_pack_a_punch;
#using scripts\zm\_zm_perk_additionalprimaryweapon;
#using scripts\zm\_zm_perk_doubletap2;
#using scripts\zm\_zm_perk_deadshot;
#using scripts\zm\_zm_perk_juggernaut;
#using scripts\zm\_zm_perk_quick_revive;
#using scripts\zm\_zm_perk_sleight_of_hand;
#using scripts\zm\_zm_perk_staminup;

//Powerups
#using scripts\zm\_zm_powerup_double_points;
#using scripts\zm\_zm_powerup_carpenter;
#using scripts\zm\_zm_powerup_fire_sale;
#using scripts\zm\_zm_powerup_free_perk;
#using scripts\zm\_zm_powerup_full_ammo;
#using scripts\zm\_zm_powerup_insta_kill;
#using scripts\zm\_zm_powerup_nuke;

//Traps
#using scripts\zm\_zm_trap_electric;

#using scripts\zm\zm_usermap;



function main()
{
	zm_usermap::main();

	include_weapons();
	
	util::waitforclient( 0 );
}


function include_weapons()
{
	zm_weapons::load_weapon_spec_from_table("gamedata/weapons/zm/zm_levelcommon_weapons.csv", 1);
}

also cant just do } as the user will have functions above the main function so in summary i need to look for the main function find that then find the } starting brace and add the text in there

thank you in advance elfenliedtopfan5

What I have tried:

did a lot of google searching on the issue plus doing what is discribed above.