Hi amitj,

Please refer the below code.

if (Convert.ToDateTime(e.Day.Date) == Convert.ToDateTime(row["Date"]))
{
    e.Cell.Text = e.Day.DayNumberText + "<br/> <a href='" + row["URL"] + "'>" + row["EventName"].ToString() + "</a>";
}
else
{
    e.Day.IsSelectable = false;
}