it is not showing correct date as per in query

private void button3_Click(object sender, EventArgs e)
{
            checkGrid = "Due";

            dueDate DD = new dueDate();

            DD.ShowDialog();

            GlobalClass GC = new GlobalClass();

            DateTime vdateFrom = GC.getDueDateFrom();
            DateTime vdateTo = GC.getDueDateTo();

            string getAllData = "Select P_Id,P_Password,Format(Treat_Due_Date,\"'dd/MM/yyyy'\") As DueDate,P_Name,P_City,medicineTaker from patient_Details,Treatment_Details Where patient_Details.P_ID = Treatment_Details.Treat_P_ID AND Treat_Due_Date >= #" + vdateFrom.ToString("dd/MM/yyyy") + "# AND Treat_Due_Date <= #" + vdateTo.ToString("dd/MM/yyyy") + "#";

            bindGrid(getAllData);            
            
}