Hello Sweish,

I am still following this forum thread.

Please feel free to let us know if you have any other questions with this matter.

Hello Sweish,

I have tried what you are describing above using the NetAdvantage for WinForms 2011 vol2 but it seems to work correctly for me. Could you please let me know what version of the Infragistics controls you are using in your application?

I have used the code snippet below to verify the mentioned behavior at my end. Could you please try it and let me know if you are still getting incorrect sorting of the Dates in the UltraGrid?

     public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
            DataTable dt = new DataTable();
            dt.Columns.Add("From", typeof(DateTime));
            dt.Columns.Add("To", typeof(DateTime));

            dt.Rows.Add(DateTime.Today.AddDays(-10).AddHours(11), DateTime.Today.AddDays(-10).AddHours(12));
            dt.Rows.Add(DateTime.Today.AddDays(-9).AddHours(10), DateTime.Today.AddDays(-9).AddHours(11));
            dt.Rows.Add(DateTime.Today.AddDays(3).AddHours(7), DateTime.Today.AddDays(3).AddHours(9));
            dt.Rows.Add(DateTime.Today.AddDays(-8).AddHours(5), DateTime.Today.AddDays(-8).AddHours(6));
            dt.Rows.Add(DateTime.Today.AddDays(4).AddHours(6), DateTime.Today.AddDays(4).AddHours(8));
            dt.Rows.Add(DateTime.Today.AddDays(6).AddHours(7), DateTime.Today.AddDays(6).AddHours(9));
            dt.Rows.Add(DateTime.Today.AddDays(1).AddHours(1), DateTime.Today.AddDays(1).AddHours(3));
            dt.Rows.Add(DateTime.Today.AddDays(5).AddHours(3), DateTime.Today.AddDays(5).AddHours(4));
            dt.Rows.Add(DateTime.Today.AddDays(-2).AddHours(4), DateTime.Today.AddDays(-2).AddHours(6));

            ultraGrid1.DataSource = dt.DefaultView;
        }

        private void ultraGrid1_InitializeLayout(object sender, Infragistics.Win.UltraWinGrid.InitializeLayoutEventArgs e)
        {
            e.Layout.Bands[0].Columns["From"].Style = Infragistics.Win.UltraWinGrid.ColumnStyle.Date;
            e.Layout.Bands[0].Columns["To"].Style = Infragistics.Win.UltraWinGrid.ColumnStyle.Date;
        }
    }

If you have any other questions please feel free to ask.