日期格式化问题

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单元格设定日期格式后
DataSource赋值以后显示没有格式化

FarPoint.Web.Spread.DateTimeCellType dtcell = new FarPoint.Web.Spread.DateTimeCellType();
         dtcell.DateTimeFormat = new System.Globalization.DateTimeFormatInfo();
         dtcell.DateTimeFormat.ShortDatePattern = "MM/dd";
         dtcell.FormatString = "MM/dd";
         dtcell.EditMode.DateTimeFormat = new System.Globalization.DateTimeFormatInfo();
         dtcell.EditMode.FormatString = "MM/dd";
         dtcell.ShowPopupButton = true;
         spdList.ActiveSheetView.Columns[4].CellType = dtcell;

直接赋值显示是格式化的，但是DataSource赋值就没有格式化显示