字符串未被识别为有效的DateTime。 asp网

Question

我想从datarow检索日期，并根据datarow中的日期进行比较。但是它有错误声明String未被识别为有效的DateTime。 This is the error example screenshot

protected void Calendar1_DayRender(object sender, DayRenderEventArgs e)
    {
        DataRow[] rows = socialEvents.Select(
              String.Format(
                 "Date >= #{0}# AND Date < #{1}#",
                 e.Day.Date.ToShortDateString(),
                 e.Day.Date.AddDays(1).ToShortDateString()
              )
           );
foreach (DataRow row in rows)
        {
            System.Web.UI.WebControls.Image image;
            image = new System.Web.UI.WebControls.Image();

            image.ToolTip = row["Description"].ToString();

            e.Cell.BackColor = Color.Wheat;
        }
}


 private void BuildSocialEventTable()
    {
        // to simulate a database query
        socialEvents = new DataTable();
        socialEvents.Columns.Add(new DataColumn("Date", typeof(DateTime)));
        socialEvents.Columns.Add(new DataColumn("Description", typeof(string)));


        DataRow row;
        row = socialEvents.NewRow();
        row["Date"] = DateTime.Now.AddDays(-5);
        row["Description"] = "Holiday";

        socialEvents.Rows.Add(row);
}