SSIS programatically update column Names and data type

Question

I have created a script task that reads an excel file and tries to update the connection manager columns' details.

BUT even if it runs without errors, the changes are not "saved", so the package maintains the previous details of the columns.

After the program reads and stores the information (ColumnNames[], MaxWidth[] ..etc.).

1. Deletes the existing columns of the connection manager:

   //INITIALIZE CONNECTION MANAGER OBJECTS
       ConnectionManager conn = Dts.Connections["Flat File Connection Manager"];
       var connectionFlatF = (Wrapper.IDTSConnectionManagerFlatFile100)conn.InnerObject;
   
   
       foreach (Wrapper.IDTSConnectionManagerFlatFileColumn100 column in connectionFlatF.Columns)
       {
           connectionFlatF.Columns.Remove(column);
       }
   

2. Creates the columns and assigns the realted information:

    for (i = 0; i < ColumnNames.Count; i++) {
   
           //Add column
           Wrapper.IDTSConnectionManagerFlatFileColumn100 flatfilecolumn = (Wrapper.IDTSConnectionManagerFlatFileColumn100)connectionFlatF.Columns.Add();
           //Add column details
           flatfilecolumn.ColumnType = "Delimited";
           flatfilecolumn.ColumnDelimiter = "\t";
           flatfilecolumn.ColumnWidth = 0;
           if (FinalType[i] == "[DT_STR]")
           {
               flatfilecolumn.MaximumWidth = Int32.Parse(MaxWidth[i]);
           }
           else if (FinalType[i] == "[DT_NUMERIC]")
           {
               flatfilecolumn.DataPrecision = Int32.Parse(Percision[i]);
               flatfilecolumn.DataScale = Int32.Parse(Scale[i]);
           }
   
           //Column name
           Wrapper.IDTSName100 columnname = (Wrapper.IDTSName100)flatfilecolumn;
           columnname.Name = ColumnNames[i];
   
   
       }
       conn.Dispose();