Real Time Logic Retrieving next 15 Days Due Date Tasks from Tasks List

DateTime str = (DateTime)DateTime.Today.AddDays(15);

            string strNewDate = str.Year + "-" + str.Month + "-" + str.Date.Day;

            SPWeb currentWeb = SPContext.Current.Web;

            SPList lst = currentWeb.Lists["Tasks"];

            SPQuery sQuery = new SPQuery();

            sQuery.Query = "<Where><Geq><FieldRef Name='DueDate' /><Value Type='DateTime'>"+strNewDate+"</Value></Geq></Where><OrderBy><FieldRef Name='DueDate' /></OrderBy>";

            SPListItemCollection myColl = lst.GetItems(sQuery);

            if (myColl.Count > 0)

            {

                dgvTasks.DataSource = myColl.GetDataTable();

                dgvTasks.DataBind();

            }