Display dates within a range as rows in GridView in ASP.Net

This way you can add the columns to DataTable. Now set the DataSource of GridView to DataTable.

protected void Page_Load(object sender, EventArgs e)
{
    if (!this.IsPostBack)
    {
        DataTable dt = new DataTable();
        for (DateTime i = Convert.ToDateTime("10/24/2014"); i <= DateTime.Now; )
        {
            dt.Columns.Add(i.ToShortDateString());
            i = i.AddDays(1);
        }
        this.GridView1.DataSource = dt;
        this.GridView1.DataBind();
    }
}