ASP.NET

if (!IsPostBack)
{
    Page.DataBind();
}
else
{
    //else section
}

private void FillGridView()
    {
        DataSet ds = SqlHelper.ExecuteDataset(Connection, CommandType.Text, "SELECT TOP 20 * FROM Users");

        this.GridView1.DataSource = ds;
        this.GridView1.DataBind();
    }

    private void FillDDL(DropDownList myDDL, int NumberRows)
    {
        for (int i = 0; i < NumberRows; i++)
        {
            myDDL.Items.Add(new ListItem((i + 1).ToString(), (i + 1).ToString()));
        }
    }
    protected void GridView1_RowDataBound(object sender, GridViewRowEventArgs e)
    {
        if (e.Row.RowType == DataControlRowType.DataRow)
        {
            //20 is the number of Rows
            FillDDL(((DropDownList)e.Row.FindControl("DropDownList1")), 20);
            ((DropDownList)e.Row.FindControl("DropDownList1")).SelectedValue = (e.Row.RowIndex + 1).ToString();
        }
    }

protected void GridView_RowDataBound(object sender, GridViewRowEventArgs e)
    {
        if (e.Row.RowType == DataControlRowType.DataRow)
        {
            //Add counter here
        }
     }