获取基于日期时间的值

我想实现的是:-

1-从数据库中获取具有当前日期(今天)的记录。2-如果数据库没有今天的记录，我希望它从前一天得到它。3-如果前一天没有任何记录，我希望它从前一天开始获取它们，以此类推。

try
    {
        string date = DateTime.Now.ToShortDateString();
        conn.Open();
        //string str = "insert into Table1 (title , date_ ,www, cat) values  (' " + TextBox1.Text + "','" + DateTime.Now.ToShortDateString() + "','" + TextBox2.Text + "','" + DropDownList1.SelectedItem.Text + "')";
        ////string str = "INSERT INTO Table1  (title,date_,www ) values ('ddddddd','aaaaaaa','qqqqqq')";

        string str =
            //"SELECT   from table1  WHERE  cat = 1 and datee='" + date + "'ORDER BY datee";
        "SELECT * FROM table1 WHERE cat = 1 and datee = @dt ORDER BY datee DESC ";

        SqlCommand objcmd = new SqlCommand(str, conn);
        objcmd.Parameters.AddWithValue("@dt", date);
        SqlDataAdapter da1 = new SqlDataAdapter(objcmd);

        DataTable dt = new DataTable();
        da1.Fill(dt);


        //DataRow dr = new DataRow();
        //DataRow dr = ds.Tables[0].Rows[0];
        int id = 1;
        foreach (DataRow dr in dt.Rows)
        {
            if (id == 1)
            {
                    ll1.Text = dr[1].ToString();
                    l1.ImageUrl = @"photo'" + dr[1].ToString() + @".jpg";

            }
            if (id == 2)
            {
                ll2.Text = dr[1].ToString();
                l2.ImageUrl = @"photo'" + dr[1].ToString() + @".jpg";
            }
            if (id == 3)
            {
                ll3.Text = dr[1].ToString();
                l3.ImageUrl = @"photo'" + dr[1].ToString() + @".jpg";
            }
            if (id == 4)
            {
                ll4.Text = dr[1].ToString();
                l4.ImageUrl = @"photo'" + dr[1].ToString() + @".jpg";
            }
            if (id == 5)
            {
                ll5.Text = dr[1].ToString();
                l5.ImageUrl = @"photo'" + dr[1].ToString() + @".jpg";
            }
            if (id == 6)
            {
                ll6.Text = dr[1].ToString();
                l6.ImageUrl = @"photo'" + dr[1].ToString() + @".jpg";
            }
            if (id == 7)
            {
                ll7.Text = dr[1].ToString();
                l7.ImageUrl = @"photo'" + dr[1].ToString() + @".jpg";
            }
            if (id == 8)
            {
                ll8.Text = dr[1].ToString();
                l8.ImageUrl = @"photo'" + dr[1].ToString() + @".jpg";
            }
            if (id == 9)
            {
                ll9.Text = dr[1].ToString();
                l9.ImageUrl = @"photo'" + dr[1].ToString() + @".jpg";
            }
            if (id == 10)
            {
                ll10.Text = dr[1].ToString();
                l10.ImageUrl = @"photo'" + dr[1].ToString() + @".jpg";
            }
            if (id == 11)
            {
                ll11.Text = dr[1].ToString();
                l11.ImageUrl = @"photo'" + dr[1].ToString() + @".jpg";
            }
            if (id == 12)
            {
                ll12.Text = dr[1].ToString();
                l12.ImageUrl = @"photo'" + dr[1].ToString() + @".jpg";
            }
            if (id == 13)
            {
                ll13.Text = dr[1].ToString();
                l13.ImageUrl = @"photo'" + dr[1].ToString() + @".jpg";
            }
            if (id == 14)
            {
                ll14.Text = dr[1].ToString();
                l14.ImageUrl = @"photo'" + dr[1].ToString() + @".jpg";
            }
            if (id == 15)
            {
                ll15.Text = dr[1].ToString();
                l16.ImageUrl = @"photo'" + dr[1].ToString() + @".jpg";
            }
            if (id == 16)
            {
                ll16.Text = dr[1].ToString();
                l16.ImageUrl = @"photo'" + dr[1].ToString() + @".jpg";
            }
            if (id == 17)
            {
                ll17.Text = dr[1].ToString();
                l17.ImageUrl = @"photo'" + dr[1].ToString() + @".jpg";
            }
            if (id == 18)
            {
                ll18.Text = dr[1].ToString();
                l18.ImageUrl = @"photo'" + dr[1].ToString() + @".jpg";
            }
            if (id == 19)
            {
                ll19.Text = dr[1].ToString();
                l19.ImageUrl = @"photo'" + dr[1].ToString() + @".jpg";
            }
            if (id == 20)
            {
                ll20.Text = dr[1].ToString();
                l20.ImageUrl = @"photo'" + dr[1].ToString() + @".jpg";
            }
            if (id == 21)
            {
                ll21.Text = dr[1].ToString();
                l21.ImageUrl = @"photo'" + dr[1].ToString() + @".jpg";
            }
            if (id == 22)
            {
                ll22.Text = dr[1].ToString();
                l22.ImageUrl = @"photo'" + dr[1].ToString() + @".jpg";
            }
            if (id == 23)
            {
                ll23.Text = dr[1].ToString();
                l23.ImageUrl = @"photo'" + dr[1].ToString() + @".jpg";
            }
            if (id == 24)
            {
                ll24.Text = dr[1].ToString();
                l24.ImageUrl = @"photo'" + dr[1].ToString() + @".jpg";
            }
            id = id + 1;
        }
    }
    catch (Exception ex)
    {
        lblError.Text = "فشل في إحظار الأخبار";
    }
    finally
    {
        conn.Close();
    }
}

   int id = 1;//???????
    foreach (DataRow dr in dt.Rows)
    {
        if (id == 1)//???????
        {
                ll1.Text = dr[1].ToString();
                l1.ImageUrl = @"photo'" + dr[1].ToString() + @".jpg";
        }

if ( dr[1] == id)
{
...
}
id++
.
.
.

string str = 
    "SELECT * FROM table1 WHERE cat = 1 and datee = @dt ORDER BY datee DESC " +
    "UNION SELECT * FROM table1 WHERE cat = 1 and datee < @dt AND (SELECT COUNT(*) FROM table1 WHERE cat = 1 and datee = @dt) = 0 ORDER BY datee DESC";

WITH Data AS (
   SELECT TOP 1 WITH TIES
      *
   FROM dbo.table1
   WHERE
      cat = 1
      AND datee >= DateAdd(day, -5, @dt)
   ORDER BY
      Convert(date, datee) DESC
)
SELECT *
FROM Data
ORDER BY datee DESC
;