C#

string sConnection = string.Format(@"Provider=Microsoft.ACE.OLEDB.12.0;Data Source={0};Extended Properties=""Excel 12.0 Xml;HDR=No;IMEX=1""", path);
OleDbConnection _Connection = new OleDbConnection(sConnection);
_Connection.Open();
string cmd = string.Format("Update [{0}$A106880:A106880] set F1 = 12", sheetname);
System.Data.OleDb.OleDbCommand myCommand = new System.Data.OleDb.OleDbCommand(cmd, connection);
if (myCommand != null) myCommand.ExecuteNonQuery();
_Connection.Close();

example (note: label1 and label2 can have only numbers):

If is label1.Text = 5  and label2.Text = 6

how to make a comparison, something like:

if (label1.Text < label2.Text)
{
   MessageBox.Show("some text...",
                    this.Text, MessageBoxButtons.OK, MessageBoxIcon.Information);
                return;
}

namespace Goat
{
 
    struct IBaseWeapon
    {
        virtual ~IBaseWeapon() {}
 
        virtual string GetName(void) = 0;
        virtual bool AddToCsv(string& strOut) = 0;
    };
 
    class Kap40 : public IBaseWeapon
    {
    public:
        Kap40() = default;
 
         virtual string GetName(void)
         {
                return "kap40";
         }
         virtual bool AddToCsv(string& strOut)
         {
                strOut += "xmodel, kap40_viewmodel\n";
                strOut += "xmodel, kap40_worldmodel\n";
                return true;
         }
    };
 
    class Ak47 : public IBaseWeapon
    {
    public:
        Ak47() = default;
 
         virtual string GetName(void)
         {
                return "ak47";
         }
         virtual bool AddToCsv(string& strOut)
         {
                strOut += "xmodel, ak47_viewmodel\n";
                strOut += "xmodel, ak47_worldmodel\n";
                return true;
         }
    };
 
    class WeaponsMng
    {
    public:
            WeaponsMng() = default;
 
            void AddWeapon(IBaseWeapon* pWeapon)
            {
                    // check if already added etc..
 
                    // add it.
                    weapons_.push_back(pWeapon);
            }
 
            void RemoveWeapon(const string& name)
            {
                    for(auto w : weapons_)
                    {
                        const string& curName = w->GetName();
                        if(curName == name) {
                            weapons_.remove(w);
                        }
                    }
            }
 
            string CreateCsc(void)
            {
                    string res;
 
                    for(auto w : weapons_)
                    {
                        w->AddToCsv(res);
                    }
 
                    // res now contains
                    /*
                        xmodel, kap40_viewmodel
                        xmodel, kap40_worldmodel
                        xmodel, ak47_viewmodel
                        xmodel, ak47_worldmodel
                    */
 
                    return res;
            }
 
    private:
        std::vector<IBaseWeapon*> weapons_;
    };
 
    WeaponsMng mng;
 
 
    void OnAddKap40_checkbox(bool isChecked)
    {
            if(isChecked)
                mng.AddWeapon(new Kap40());
            else
                 mng.RemoveWeapon("kap40"); // matches the name "virtual string GetName(void)" returns
    }
 
    void OnAddAk47_checkbox(bool isChecked)
    {
            if(isChecked)
                mng.AddWeapon(new ak47());
            else
                 mng.RemoveWeapon("ak47"); // matches the name "virtual string GetName(void)" returns
    }
 
}