how to display time into the textbox! can you help me!

i just create one database it's: create table HANGHOA ( MAHANG varchar(9) not null, TENHANG nvarchar(50) not null, DVDOLUONG nvarchar(15) not null, DINHLUONG int not null, DONVI nvarchar(15) not null, MOTA nvarchar(50) null , TONKHO int null , DGBAN int null , CANDUOI int null , constraint PK_HANGHOA primary key (MAHANG) ) When i created datagrid and add TENHANG to col1 : private void CreateDataGridStyle() { this.dataGrid1.ReadOnly=true; DGStyle = new DataGridTableStyle(); DGStyle.MappingName ="HANGHOA"; col1 = new DataGridTextBoxColumn(); col1.MappingName ="TENHANG"; col1.HeaderText = "TH"; col1.Width = 90; } but now i want to create table TH with three MappingName : "HANGHOA";"DVDOLUONG";"DINHLUONG" to one. Because when i create datagrid it's have 3 column but now i want to view it's one. private void CreateDataGridStyle() { this.dataGrid1.ReadOnly=true; DGStyle = new DataGridTableStyle(); DGStyle.MappingName ="HANGHOA"+"DINHLUONG"+"DVDOLUONG"; col1 = new DataGridTextBoxColumn(); col1.MappingName ="TENHANG"; col1.HeaderText = "TH"; col1.Width = 90; } ex: table first is HANGHOA DVDOLUONG DINHLUONG abc 1 st but end is "TableMapping" abc is 1st i said may be you can't understand but may be my "ex:" be you see the problem! Thanks !!!Please Help me!