Best way add a new column with sequential numbering in an existing data table

Question

I have a non empty datatable . What is the best way to add another column to it that has sequential numbering starting from 1.

I tried the following code. But did not wo

Answer 1

below code worked for me

Code is Edited

        // Added temp rows so that this solution can mimic actual requirement

        DataTable dt = new DataTable();
        DataColumn dc1 = new DataColumn("Col");
        dt.Columns.Add(dc1);

        for(int i=0;i<10;i++)
        {
            DataRow dr = dt.NewRow();
             dr["Col"] = i.ToString();
             dt.Rows.Add(dr);
        }


        // Added new column with Autoincrement, 

        DataColumn dc = new DataColumn("Col1"); 
        dc.AutoIncrement = true;
        dc.AutoIncrementSeed = 1;
        dc.DataType = typeof(Int32);

        // Handeled CollectionChanged event

        dt.Columns.CollectionChanged += new CollectionChangeEventHandler(Columns_CollectionChanged);
        dt.Columns.Add(dc);

        // After column added demostratation

        DataRow dr1 = dt.NewRow();
            dt.Rows.Add(dr1);



    void Columns_CollectionChanged(object sender, CollectionChangeEventArgs e)
    {
        DataColumn dc = (e.Element as DataColumn);
        if (dc != null && dc.AutoIncrement)
        {
            long i = dc.AutoIncrementSeed;
            foreach (DataRow drow in dc.Table.Rows)
            {
                drow[dc] = i;
                i++;
            }
        }
    }