Get Min and Max Date from DataTable in ASP.Net using C#

Hi,

How to do get Min / Max Date value from DataTable in ASP.Net?

My code below, but return is

System.Data.DataRow[]
System.Data.DataRow[]

c#

private DataTable Rss()
{
    DataTable dt = new DataTable();
    DataSet ds = new DataSet();
 
    using (MySqlConnection myConnectionString =
        new MySqlConnection(ConfigurationManager.ConnectionStrings["cn"].ConnectionString))
    {
        using (MySqlCommand cmd =
            new MySqlCommand("sp_tb_s", myConnectionString))
        {
            cmd.CommandTimeout = 2147483;
            cmd.Connection.Open();
            cmd.CommandType = CommandType.StoredProcedure;
            cmd.Parameters.Clear();
 
            adapter.Fill(ds);
 
            if (ds.Tables.Count > 0)
            {
                dt = ds.Tables[0];                      
 
                var maxRow = dt.Select("_Date = MAX(_Date)").ToString();
                var minRow = dt.Select("_Date = MIN(_Date)").ToString();
 
                Response.Write(maxRow + "<br />" + minRow + "<br />");
            }
        }
    }
    return dt;
}