How can I set a value to a "value"-type generic object?

How can I set a value to a "value"-type generic object?

My goal is to retrieve a column of scalar data and convert them into a list of integers.

Suppose, I have the following code snippet:

 public class DataAccess
 {
      SafeDataReader dataReader;

      public IList<Tcom> Get<Tcom>(ITransactionManager tm, string SQL, params object[] parameters)
      {
          T tempO = Activator.CreateInstance<T>();

          Object objValue = dataReader.GetFieldValue(0);
          ... 
     }
     ...
}

Its usage can be

    public IEnumerable<int> GetIDs()
    {
        IEnumerable<int> list = null;

        TransactionManager tm = new TransactionManager(DBNameConst.CurrentDB);

        try
        {
            tm.BeginTransaction();

            list = AgeGroupDataAccess.Get<int>(tm, @"select ID from AgeGroup");
            
            tm.CommitTransaction();
        }
        catch (Exception)
        {
            tm.RollbackTransaction();

            throw;
        }

        return list;
    }

Here, T can be either value types or class types.

• I know how to set values to a class-type.

But, say, T is a value type like Int32.

How can I set objValue to a tempO?

E.g.

TypeConverter tc = new TypeConverter();
tempO = tc.ConvertTo(objValue, typeof(Tcom));

doesn't work.

---

Additional source code:

class SafeDataReader
{

   private IDataReader reader = null;

   //...

    public virtual int? GetFieldValue(int columNo)
    {
        
        int? data = null;
        //int column = reader.GetOrdinal(columnName);

        string columnName = reader.GetName(columNo);
        if (!reader.IsDBNull(reader.GetOrdinal(columnName)))
        {
            data = Convert.ToInt32(reader[columnName]);
        }

        return data;
    }

    //...
}